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:

Supplemental air bag warning light
The supplemental air bag warning light, displaying in the instrument panel, monitors the circuits for the air bag systems, pretensioners and all related wiring. When the ignition switch is placed in the ON or START position, the supplemental air bag warning light illuminates for about ...

A-bag branch line circuit
Diagnosis procedure Warning: Always observe the following items for preventing accidental activation. Before servicing, turn ignition switch off, disconnect battery negative terminal, and wait 3 minutes or more. (To discharge backup capacitor.) Never use unspecified tester or other me ...

Break-in schedule
CAUTION During the first 1,200 miles (2,000 km), follow these recommendations to obtain maximum engine performance and ensure the future reliability and economy of your new vehicle. Failure to follow these recommendations may result in shortened engine life and reduced engine performance. A ...