Nissan Sentra Service Manual: DTC/circuit diagnosis

U1000 CAN COMM CIRCUIT

Description

CAN (Controller Area Network) is a serial communication system for real time application. It is an on-vehicle multiplex communication system with high data communication speed and excellent error detection ability.

Many electronic control units are equipped onto vehicles, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with two communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. Refer to LAN-30, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart".

DTC Logic

DTC DETECTION LOGIC

DTC	Items (CONSULT screen terms)	DTC detection condition	Possible cause
U1000	CAN COMM CIRCUIT	When A/C auto amp. is not transmitting or receiving CAN communication signal for 2 or more seconds.	CAN communication system

DTC CONFIRMATION PROCEDURE

1.PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn ignition switch ON and wait for 2 seconds or more.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.

Is DTC detected? YES >> Refer to HAC-58, "Diagnosis Procedure".

NO >> Refer to GI-39, "Intermittent Incident".

Diagnosis Procedure

1.CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to LAN-16, "Trouble Diagnosis Flow Chart".

>> Inspection End.

U1010 CONTROL UNIT (CAN)

Description

Initial diagnosis of A/C auto amp.

DTC Logic

DTC DETECTION LOGIC

DTC	Items (CONSULT screen terms)	DTC detection condition	Possible cause
U1010	CONTROL UNIT (CAN)	When detecting error during the initial diagnosis of CAN controller of A/C auto amp.	A/C auto amp.

DTC CONFIRMATION PROCEDURE

1.PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.

Is DTC detected? YES >> Refer to HAC-59, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

1.REPLACE A/C AUTO AMP.

Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

>> Inspection End.

B2578, B2579 IN-VEHICLE SENSOR

DTC Logic

DTC DETECTION LOGIC

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC- 59, "DTC Logic".

DTC	Items (CONSULT screen terms)	DTC detection condition	Possible cause
B2578	IN-VEHICLE SENSOR	The in-vehicle sensor recognition temperature is too high.	In-vehicle sensor A/C auto amp. Harness or connectors (The sensor circuit is open or shorted.)
B2579		The in-vehicle sensor recognition temperature is too low.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.

Is DTC detected? YES >> Refer to HAC-60, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check in-vehicle sensor power supply

1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Turn ignition switch ON.
4. Check voltage between in-vehicle sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 2.

No >> go to 4.

2.Check in-vehicle sensor ground circuit

1. Turn ignition switch OFF.
2. Check continuity between front in-vehicle sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair harness or connector.

3.CHECK IN-VEHICLE SENSOR

Check in-vehicle sensor. Refer to HAC-61, "Component Inspection".

Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

NO >> Replace in-vehicle sensor. Refer to HAC-107, "Removal and Installation".

4.Check in-vehcile sensor power supply circuit for open

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.

Is the inspection result normal? Yes >> go to 5.

No >> repair harness or connector.

5.Check in-vehicle sensor power supply circuit for ground short

Check continuity between in-vehicle sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 6.

No >> repair harness or connector.

6.Check in-vehicle sensor power supply circuit for power short

1. Turn ignition switch ON.
2. Check voltage between in-vehicle sensor harness connector and ground.

Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

NO >> Repair harness or connector.

Component Inspection

1.Check in-vehicle sensor

1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Check resistance between in-vehicle sensor terminals.

Is the inspection result normal? YES >> Inspection End.

NO >> Replace in-vehicle sensor. Refer to HAC-107, "Removal and Installation".

B257B, B257C AMBIENT SENSOR

DTC Logic

DTC DETECTION LOGIC

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC- 59, "DTC Logic".

DTC	Items (CONSULT screen terms)	DTC detection condition	Possible cause
B257B	AMBIENT SENSOR	The ambient sensor recognition temperature is too high.	Ambient sensor A/C auto amp. Harness or connectors (The sensor circuit is open or shorted.)
B257C		The ambient sensor recognition temperature is too low.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results

Is DTC detected? YES >> Refer to HAC-63, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check ambient sensor power supply

1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 2.

No >> go to 4.

2.Check ambient sensor ground circuit

1. Turn ignition switch off.
2. Check continuity between ambient sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector

3.Check ambient sensor

Check ambient sensor. Refer to hac-64, "component inspection".

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> replace ambient sensor. Refer to hac-106, "removal and installation".

4.Check ambient sensor power supply circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp.Connector.
3. Check continuity between ambient sensor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 5.

No >> repair harness or connector.

5.Check ambient sensor power supply circuit for ground short

Check continuity between ambient sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 6.

No >> repair harness or connector.

6.Check ambient sensor power supply circuit for power short

1. Turn ignition switch on.
2. Check voltage between ambient sensor harness connector and ground.

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> repair harness or connector.

Component Inspection

1.Check ambient sensor

1. Turn ignition switch off.
2. Disconnect ambient sensor connector.
3. Check resistance between ambient sensor terminals.

Is the inspection result normal? Yes >> inspection end.

No >> replace ambient sensor. Refer to hac-106, "removal and installation".

B2581, B2582 INTAKE SENSOR

DTC Logic

Dtc detection logic

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC- 59, "DTC Logic".

DTC	Items (CONSULT screen terms)	DTC detection condition	Possible cause
B2581	INTAKE SENSOR	The intake sensor recognition temperature is too high.	Intake sensor A/C auto amp Harness or connectors (The sensor circuit is open or shorted.)
B2582		The intake sensor recognition temperature is too low.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.

Is DTC detected? YES >> Refer to HAC-66, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check intake sensor power supply

1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 2.

NO >> GO TO 4.

2.Check intake sensor ground circuit

1. Turn ignition switch OFF.
2. Check continuity between intake sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector.

3.Check intake sensor

Check intake sensor. Refer to hac-67, "component inspection".

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> replace intake sensor. Refer to hac-109, "removal and installation".

4.Check intake sensor power supply circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between intake sensor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 5.

No >> repair harness or connector.

5.Check intake sensor power supply circuit for short to ground

Check continuity between intake sensor harness connector and ground.

Is the inspection result normal? Yes >> go to 6.

No >> repair harness or connector.

6.Check intake sensor power supply circuit for short to voltage

1. Turn ignition switch on.
2. Check voltage between intake sensor harness connector and ground.

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> repair harness or connector.

Component Inspection

1.Check intake sensor

1. Turn ignition switch off.
2. Disconnect intake sensor connector
3. Check resistance between intake sensor terminals.

Is the inspection result normal? YES >> Inspection End.

NO >> Replace intake sensor. Refer to HAC-109, "Removal and Installation".

B2630, B2631 SUNLOAD SENSOR

DTC Logic

Dtc detection logic

Note:

• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is insufficient.

  When performing the diagnosis indoors, light the sunload sensor with a lamp (60w or more).

• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to HAC- 58, "DTC Logic" (U1000) or HAC-59, "DTC Logic" (U1010).

Dtc	Items (consult screen terms)	Diagnostic item is detected when...	Possible cause
B2630	Sunload sen (short)	Detected calorie at sunload sensor 1677 w/m2 (1442 kcal/m2В·h) or more	Sunload sensor A/c auto amp Harness and connector (sunload sensor circuit is open, or there is a short in the circuit)
B2631	Sunload sen (open)	Detected calorie at sunload sensor 33 w/m2 (28 kcal/m2В·h)

Dtc confirmation procedure

1.Check with self-diagnosis function of consult

1. Using consult, perform “self-diagnosis results” of hvac.
2. Check if any dtc no. Is displayed in the self-diagnosis results.

NOTE:

• If dtc is displayed along with dtc u1000 or u1010, first diagnose the dtc u1000 or u1010. Refer to hac- 58, "dtc logic" (u1000) or hac-59, "dtc logic" (u1010).
• Sunload sensor may register a malfunction when indoors, at dusk, or at other times when light is insufficient.

  When performing the diagnosis indoors, light the sunload sensor with a lamp (60W or more).

Is dtc no.“B2630” or “b2631” displayed? Yes >> perform trouble diagnosis for the sunload sensor. Refer to hac-69, "diagnosis procedure".

No >> inspection end.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check sunload sensor power supply

1. Disconnect sunload sensor connector.
2. Turn ignition switch on.
3. Check voltage between sunload sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 2.

NO >> GO TO 4.

2.Check continuity between sunload sensor and a/c auto amp.

1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between sunload sensor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair harness or connector.

3.Check sunload sensor

1. Reconnect sunload sensor connector and a/c auto amp. Connector.
2. Check sunload sensor. Refer to hac-70, "component inspection".

Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

NO >> Replace sunload sensor. Refer to HAC-108, "Removal and Installation".

4.Check continuity between sunload sensor and a/c auto amp.

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between sunload sensor harness connector and A/C auto amp. harness connector.

4. Check continuity between sunload sensor harness connector and ground.

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> repair harness or connector.

Component Inspection

1.Check sunload sensor

1. Turn ignition switch on.
2. Check voltage between A/C auto amp. harness connector and ground.

Note:

Select a place in direct sunlight when checking sunload sensor.

Is the inspection result normal? Yes >> inspection end.

No >> replace sunload sensor. Refer to hac-108, "removal and installation".

B27A2, B27A3, B27A4, B27A5 AIR MIX DOOR MOTOR (DRIVER SIDE)

DTC Logic

Dtc detection logic

Note:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to HAC- 58, "DTC Logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC- 59, "DTC Logic".
• If air mix door motors dtc (b27a2 – b27a5) are detected, there is probably a disconnected connector or an open circuit in air mix door motor drive power supply harness.

Dtc	Items (consult screen terms)	Dtc detection condition	Possible cause
B27a2	DR AIR MIX DOOR MOT	Short or open circuit of air mix door motor drive signal terminal 1.	Air mix door motor A/c auto amp. Harness or connectors (the motor circuit is open or shorted.)
B27a3		Short or open circuit of air mix door motor drive signal terminal 2.
B27a4		Short or open circuit of air mix door motor drive signal terminal 3.
B27a5		v

Dtc confirmation procedure

1.Perform dtc confirmation procedure

With consult

1. Turn ignition switch on.
2. Select “self diagnostic result” mode of “hvac” using consult.
3. Check dtc.

Is DTC detected? YES >> Refer to HAC-74, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check air mix door motor power supply

1. Turn ignition switch off
2. Disconnect air mix door motor connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor harness connector and ground.

Is the inspection result normal? Yes >> go to 2.

No >> repair harness or connector between air mix door motor and fuse.

2.Check air mix door motor lh drive signal circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between air mix door motor lh harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector.

3.Check air mix door motor lh drive signal circuit for short

Check continuity between air mix door motor LH harness connector and A/C auto amp. harness connector.

Is the inspection result normal? Yes >> go to 4.

No >> repair harness or connector.

4.Check air mix door motor lh

Check air mix door motor lh. Refer to hac-75, "component inspection".

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> replace air mix door motor lh. Refer to hac-112, "air mix door motor : removal and installation - air mix door motor lh".

Component Inspection

1.Check air mix door motor lh

1. Remove air mix door motor lh. Refer to hac-112, "air mix door motor : removal and installation - air mix door motor lh".
2. Check resistance between air mix door motor LH terminals. Refer to applicable table for the normal value.

Is the inspection result normal? YES >> Inspection End.

NO >> Replace air mix door motor LH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation - Air Mix Door Motor LH".

B27AA, B27AB, B27AC, B27AD AIR MIX DOOR MOTOR (PASSENGER SIDE)

DTC Logic

Dtc detection logic

Note:

• If dtc is displayed along with dtc u1000, first perform the trouble diagnosis for dtc u1000. Refer to hac- 58, "dtc logic"
• If dtc is displayed along with dtc u1010, first perform the trouble diagnosis for dtc u1010. Refer to hac- 59, "dtc logic"
• If air mix door motors dtc (b27a2 – b27a5) are detected, there is probably a disconnected connector or an open circuit in air mix door motor drive power supply harness.

Dtc	Items (consult screen terms)	Dtc detection condition	Possible cause
B27aa	As air mix door mot	Short or open circuit of air mix door motor drive signal terminal 1.	Air mix door motor A/C auto amp Harness or connectors (the motor circuit is open or shorted.)
B27AB		Short or open circuit of air mix door motor drive signal terminal 2.
B27ac		Short or open circuit of air mix door motor drive signal terminal 3.
B27ad		Short or open circuit of air mix door motor drive signal terminal 4.

Dtc confirmation procedure

1.Perform dtc confirmation procedure

With consult

1. Turn ignition switch on.
2. Select “self diagnostic result” mode of “hvac” using consult.
3. Check dtc.

Is DTC detected? YES >> Refer to HAC-74, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding wiring diagram information, refer to hac-41, "wiring diagram".

1.Check air mix door motor rh power supply

1. Turn ignition switch off.
2. Disconnect air mix door motor RH connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor rh harness connector and ground.

Is the inspection result normal? Yes >> go to 2.

No >> repair harness or connector.

2.Check air mix door motor drive signal circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between air mix door motor rh harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector.

3.Check air mix door motor RH drive signal circuit for short

Check continuity between air mix door motor rh harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 4.

No >> repair harness or connector.

4.Check air mix door motor rh

Check air mix door motor rh. Refer to hac-75, "component inspection".

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> replace air mix door motor rh. Refer to hac-112, "air mix door motor : removal and installation - air mix door motor rh".

Component Inspection

1.Check air mix door motor RH

1. Remove air mix door motor rh. Refer to hac-112, "air mix door motor : removal and installation -air mix door motor rh".
2. Check resistance between air mix door motor rh terminals. Refer to applicable table for the normal value.

Is the inspection result normal? Yes >> inspection end.

NO >> Replace air mix door motor RH. Refer to HAC-112, "AIR MIX DOOR MOTOR : Removal and Installation - Air Mix Door Motor RH".

B27A6, B27A7, B27A8, B27A9 MODE DOOR MOTOR

DTC Logic

Dtc detection logic

Note:

• If dtc is displayed along with dtc u1000, first perform the trouble diagnosis for dtc u1000. Refer to hac- 58, "dtc logic".
• If dtc is displayed along with dtc u1010, first perform the trouble diagnosis for dtc u1010. Refer to hac- 59, "dtc logic".
• If mode door motors dtc (b27a6 – b27a9) are detected, there is probably a disconnected connector or an open circuit in mode door motor drive power supply harness.

Dtc	Items (consult screen terms)	Dtc detection condition	Possible cause
B27A6	MODE DOOR MOTOR	Short or open circuit of mode door motor drive signal terminal 1.	Mode door motor A/C auto amp. Harness or connectors (The motor circuit is open or shorted.)
B27A7		Short or open circuit of mode door motor drive signal terminal 2.
B27A8		Short or open circuit of mode door motor drive signal terminal 3.
B27A9		Short or open circuit of mode door motor drive signal terminal 4.

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check DTC.

Is DTC detected? YES >> Refer to HAC-77, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to HAC-41, "Wiring Diagram".

1.Check mode door motor power supply

1. Turn ignition switch OFF.
2. Disconnect mode door motor connector.
3. Turn ignition switch ON.
4. Check voltage between mode door motor harness connector and ground.

Is the inspection result normal? Yes >> go to 2.

No >> repair harness or connector between mode door motor and fuse.

2.Check mode door motor drive signal circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between mode door motor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector.

3.Check mode door motor drive signal circuit for short

Check continuity between mode door motor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair harness or connector.

4.Check mode door motor

Check mode door motor. Refer to HAC-78, "Component Inspection".

Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

NO >> Replace mode door motor. Refer to HAC-112, "MODE DOOR MOTOR : Removal and Installation".

Component Inspection

1.Check mode door motor

1. Remove mode door motor. Refer to hac-112, "mode door motor : removal and installation".
2. Check resistance between mode door motor terminals. Refer to applicable table for the normal value.

Is the inspection result normal? Yes >> inspection end.

No >> replace mode door motor. Refer to hac-112, "mode door motor : removal and installation".

B27A0, B27A1 INTAKE DOOR MOTOR

DTC Logic

Dtc detection logic

Note:

• If dtc is displayed along with dtc u1000, first perform the trouble diagnosis for dtc u1000. Refer to hac- 58, "dtc logic".
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC- 59, "DTC Logic".

Dtc	Items (consult screen terms)	Dtc detection condition*	Possible cause
B27A0	Intake door motor	Pbr opening angle of intake door motor is 50% or more. (Pbr feedback signal voltage of intake door motor is 2.5 V or more)	Intake door motor Intake door motor system installation condition A/C auto amp Harness or connectors (the motor circuit is open or shorted.)
B27A1		Pbr opening angle of intake door motor is 30% or less. (Pbr feedback signal voltage of intake door motor is 1.5 V or less)

*: A/c auto amp. Operates intake door motor according to target value of pbr opening angle at 40% when performing self-diagnosis.

Dtc confirmation procedure

1.Perform dtc confirmation procedure

With consult

1. Start engine.
2. Select “Self Diagnostic Result” mode of “HVAC” using CONSULT.
3. Check dtc.

Is DTC detected? YES >> Refer to HAC-79, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

Regarding wiring diagram information, refer to hac-41, "wiring diagram".

1.Check intake door motor operation

1. Turn ignition switch on.
2. Operate intake switch and check by operation sound that intake door motor operates

Does the intake door motor operate? Yes >> go to 2.

No >> go to 8.

2.Check intake door motor PBR power supply

1. Disconnect intake door motor connector.
2. Turn ignition switch on.
3. Check voltage between intake door motor harness connector and ground.

Is the inspection result normal?

Yes >> go to 3.

No >> go to 7.

3.Check intake door motor pbr ground circuit for open

1. Turn ignition switch off.
2. Disconnect a/c auto amp. Connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal? Yes >> go to 4.

No >> repair harness or connector.

4.Check intake door motor PBR feedback signal circuit for open

Check continuity between intake door motor harness connector and a/c auto amp. Harness connector.

Is the inspection result normal? Yes >> go to 5.

No >> repair harness or connector.

5.Check intake door motor PBR feedback signal circuit for short

Check continuity between intake door motor harness connector and ground.

Is the inspection result normal? Yes >> go to 6.

No >> repair harness or connector.

6.Check intake door motor  PBR

Check intake door motor pbr. Refer to hac-81, "component inspection (pbr)".

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> replace intake door motor. Refer to hac-112, "intake door motor : removal and installation".

7.Check intake door motor pbr power supply circuit for open

1. Turn ignition switch OFF
2. Disconnect a/c auto amp. Connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector.

Is the inspection result normal? Yes >> replace a/c auto amp. Refer to hac-105, "removal and installation".

No >> repair harness or connector.

8.Check intake door motor drive signal circuit for open

1. Turn ignition switch OFF.
2. Disconnect intake door motor connector, and a/c auto amp. Connector.
3. Check continuity between intake door motor harness connector and A/C auto amp. harness connector

Is the inspection result normal? Yes >> go to 9.

No >> repair harness or connector.

9.Check intake door motor drive signal circuit for short

Check continuity between intake door motor harness connector and ground.

Is the inspection result normal? Yes >> go to 10.

No >> repair harness or connector.

10.Check intake door motor

1. Turn ignition switch off.
2. Check intake door motor. Refer to hac-82, "component inspection (motor)".

Is the inspection result normal? YES >> GO TO 11.

NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installation".

11.Check installation of intake door motor system

Check intake door motor system is properly installed. Refer to HAC-111, "Exploded View".

Is the inspection result normal? YES >> Replace A/C auto amp. Refer to HAC-105, "Removal and Installation".

NO >> Repair or replace malfunctioning parts.

Component Inspection (PBR)

1.Check intake door motor PBR

Check resistance between intake door motor terminals.

Is the inspection result normal? YES >> Inspection End.

NO >> Replace intake door motor. Refer to HAC-112, "INTAKE DOOR MOTOR : Removal and Installation".

Component Inspection (Motor)

1.Check intake door motor

Supply intake door motor terminals with battery voltage and check by visually and operation sound that intake door motor operates.

Is the inspection result normal? Yes >> inspection end.

No >> replace intake door motor. Refer to hac-112, "intake door motor : removal and installation".