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Nissan Sentra B18 (2020-2025) Service Manual: Ecu Diagnosis Information

A/c Amp.

Values on the Diagnosis Tool

Values on the Diagnosis Tool

Note:

The following table includes information (items) inapplicable to this Nissan Sentra vehicle: For information (items) applicable to this vehicle, refer to CONSULT display items.

Monitor item

Condition

Value/Status

AMB TEMP SEN

Ignition switch ON

Equivalent to ambient temperature

(Display range: -40 - 215° C)

INT TEMP SEN

Ignition switch ON

Equivalent to evaporator fin temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

AMB SEN CAL

Ignition switch ON

Equivalent to ambient temperature

(Display range: -40 - 215° C)

INT TEMP CAL

Ignition switch ON

Equivalent to evaporator fin temperature

(Display range: -40 - 215° C)

When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.

XM

Ignition switch ON

Value according to target air flow temperature (driver side)

(Display range: -100 - 150)

FAN REQ SIG

Ignition switch ON

Blower motor: ON

On

Blower motor: OFF

Off

FAN DUTY

Engine: Run at idle after warming up

Blower motor: ON

25 – 89%

(Display range: 0 - 100%)

Blower motor: OFF

0

COMP REQ SIG

Ignition switch ON

A/C switch : ON

request

A/C switch : OFF

not request

A/C comp clutch status

Engine: Run at idle after warming up

A/C switch : ON

On

A/C switch : OFF

Off

Cooling fan request

Ignition switch ON

Equivalent to cooling fan operation request

Rear window defogger request

Ignition switch ON

Rear window defogger switch: ON

On

Rear window defogger switch: OFF

Off

Eco mode request

Ignition switch ON

Drive mode: ECO

Request

Other than above

Not REQ

Illumination control duty

Ignition switch ON

Equivalent to illumination control duty

Refrigerant PRESS SEN value

Ignition switch ON

Equivalent to refrigerant pressure

Heated steering wheel request

 Note:

This item displayed, but cannot be monitored.

Nissan Sentra Vehicle speed

When driving the Nissan Sentra vehicle

Equivalent to speedometer reading

(Display range: 0 - 120 km/h)

ODO/TRIP METER

Ignition switch ON

Equivalent to odometer reading

Engine RPM

Engine: Running

Equivalent to tachometer reading

(Display range: 0 - 8191.75 rpm)

ENG COOL TEMP

Ignition switch ON

Equivalent to engine coolant temperature

(Display range: -40 - 215° C)

Reference Value

Reference Value

TERMINAL LAYOUT

PHYSICAL VALUES

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/Output

1

(W)

58

(LA/B)

Door motor power supply

Output

Ignition switch ON

Battery voltage

22

(G)

58

(LA/B)

LIN1 (door motor)

Input/Output

Ignition switch ON

23

(L)

26

(LA/BR)

Intake sensor signal

Input

Ignition switch ON

26

(LA/BR)

Ground

Sensor ground 1

—

Ignition switch ON

0 V

34

(R)

58

(LA/B)

Blower motor control signal

Output

Ignition switch ON

Blower motor: OFF

Battery voltage

Blower motor: 1st speed (manual)

50

(LA/L)

—

CAN-High

Input/Output

—

—

55*

(W)

Ground

Heated seat LH high relay control

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

58

(LA/B)

Ground

Ground

—

Ignition switch ON

0 V

60

(P)

58

(LA/B)

Accessory power supply

Input

Ignition switch OFF (auto ACC status) or ON

Battery voltage

Ignition switch OFF (not auto ACC status)

0 V

68

(LA/SB)

58

(LA/B)

LIN2 (A/C control)

Input/Output

Ignition switch ON

70

(LA/P)

—

CAN-Low

Input/Output

—

—

75*

(R)

Ground

Heated seat LH low relay control

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

76*

(LG)

Ground

Heated seat RH low relay control

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

79*

(GR)

Ground

Heated seat RH high relay control

Output

Heated seat ON

0 V

Heated seat OFF

Battery voltage

*: With heated seat system

Fail-Safe

Fail-safe

FAIL-SAFE FUNCTION

  • If a CAN communication error exists between the A/C amp., ECM, IPDM E/R, BCM and combination meter for 2 seconds or longer, air conditioning is controlled under the following conditions:

    A/C compressor

    : OFF

  • If a LIN communication error exists between the A/C amp. and A/C switch assembly for 30 seconds or longer, air conditioning is controlled under the following conditions:

    A/C compressor

    : Setting before communication error occurs

    Air outlet

    : Setting before communication error occurs

    Air inlet

    : Setting before communication error occurs

    Blower fan speed

    : Setting before communication error occurs

Dtc Inspection Priority Chart

DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart:

Priority

Detected items (DTC)

1

  • U1010–49: CONTROL UNIT(CAN)

  • U2140-87: CAN comm err (ECM)

  • U2148-87: CAN comm err (brake control unit)

  • U214E-87: CAN comm err (combination meter)

  • U214F-87: CAN comm err (BCM)

  • U215B-87: CAN comm err (IPDM E/R)

2

  • B24A4–11: INTAKE SENSOR

  • B24A4–15: INTAKE SENSOR

  • B24AF-12: Front heated seat relay LH (LO)

  • B24AF-14: Front heated seat relay LH (LO)

  • B24B0-12: Front heated seat relay LH (HI)

  • B24B0-14: Front heated seat relay LH (HI)

  • B24B4-02: A/C CONTROL

  • B24BA-12: Front heated seat relay RH (LO)

  • B24BA-14: Front heated seat relay RH (LO)

  • B24BC-12: Front heated seat relay RH (HI)

  • B24BC-14: Front heated seat relay RH (HI)

  • B24D4-08: A/C CONTROL COMM

  • B24F5-93: Mode door motor

  • B24F6-93: Intake door motor

  • B24F7-93: Air mix door motor 1

Dtc Index

DTC Index

Self Diagnostic Result

DTC

Items

(CONSULT screen terms)

Reference

B24A4–11

INTAKE SENSOR

DTC Diagnosis Procedure

B24A4–15

INTAKE SENSOR

DTC Diagnosis Procedure

B24AF-12

Front heated seat relay LH (LO)

DTC Diagnosis Procedure

B24AF-14

Front heated seat relay LH (LO)

DTC Diagnosis Procedure

B24B0-12

Front heated seat relay LH (HI)

DTC Diagnosis Procedure

B24B0-14

Front heated seat relay LH (HI)

DTC Diagnosis Procedure

B24B4–02

A/C CONTROL

DTC Diagnosis Procedure

B24BA-12

Front heated seat relay RH (LO)

DTC Diagnosis Procedure

B24BA-14

Front heated seat relay RH (LO)

DTC Diagnosis Procedure

B24BC-12

Front heated seat relay RH (HI)

DTC Diagnosis Procedure

B24BC-14

Front heated seat relay RH (HI)

DTC Diagnosis Procedure

B24D4-08

A/C CONTROL COMM

DTC Diagnosis Procedure

B24F5-93

Mode door motor

DTC Diagnosis Procedure

B24F6-93

Intake door motor

DTC Diagnosis Procedure

B24F7-93

Air mix door motor 1

DTC Diagnosis Procedure

U1010–49

CONTROL UNIT(CAN)

DTC Diagnosis Procedure

U2140-87

CAN comm err (ECM)

DTC Diagnosis Procedure

U2148-87

CAN comm err (brake control unit)

DTC Diagnosis Procedure

U214E-87

CAN comm err (combination meter)

DTC Diagnosis Procedure

U214F-87

CAN comm err (BCM)

DTC Diagnosis Procedure

U215B-87

CAN comm err (IPDM E/R)

DTC Diagnosis Procedure

Ecm, Bcm, Ipdm E/r

List of Ecu Reference

List of ECU Reference

ECU

Reference

ECM

Values On The Diagnosis Tool

Physical Values

Fail-safe

DTC Inspection Priority Chart

DTC Index

Test Value and Test Limit

BCM

Values on the Diagnosis Tool

Reference Value

Fail-safe

DTC Inspection Priority Chart

DTC Index

IPDM E/R

Values on the Diagnosis Tool

Reference Value

Fail-safe

DTC Inspection Priority Chart

DTC Index

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