Nissan Sentra Service Manual: P0603 ECM

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0603 ECM

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0603	ECM BACK UP CIRCUIT [Internal control module keep alive memory (KAM) error]	Malfunction in the internal back up RAM of ECM. Malfunction in the internal EEP-ROM system of ECM.	ECM power supply ECM

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 11 V or more with ignition switch ON

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait at least 1 second.
Turn ignition switch OFF and wait at least 10 seconds.
Repeat step 1 and 2 for 10 times.
Turn ignition switch ON.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-346, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK ECM POWER SUPPLY AND GROUND CIRCUIT

Perform trouble diagnosis for ECM power supply and ground circuit. Refer to EC-164, "Diagnosis Procedure".

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

NO >> Repair or replace error-detected parts.

2.CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to GI-39, "Intermittent Incident".

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

NO >> Repair or replace error-detected parts.

3.PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON.
Erase DTC.
Perform DTC confirmation procedure. Refer to EC-346, "DTC Logic".

Is the 1st trip DTC P0603 displayed again? YES >> Replace ECM. Refer to EC-485, "Removal and Installation".

NO >> INSPECTION END

P0524 Engine oil pressure

DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0524 ENGINE OIL PRESSURE (Engine oil ...

P0604 ECM

DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0604 ECM [Internal control module ...

Other materials:

P0846 Transmission fluid pressure SEN/SW B
DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition Possible causes P0846 TRANSMISSION FLUID PRESSURE SEN/SW B (Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance) The detection ...

Doors
When the doors are locked using one of the following methods, the doors cannot be opened using the inside or outside door handles. The doors must be unlocked to open the doors. WARNING Always have the doors locked while driving. Along with the use of seat belts, this provides ...

P0037, P0038 HO2S2 Heater
DTC Logic DTC DETECTION LOGIC DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0037 HO2 HTR (B1) (HO2S heater control circuit low bank 1 sensor 2) The current amperage in the heated oxygen sensor 2 heater ci ...