Nissan Altima 2007-2012 Service Manual: P0603 ECM Power supply

Description

Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 1 second.

2. Start engine and let it idle for 1 second.

3. Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

4. Repeat steps 2 and 3 for four times.

5. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Go to EC-862, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the voltage between ECM harness connector and ground.

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

NO >> GO TO 2.

2.DETECT MALFUNCTIONING PART

Check the following.

• 15A fuse (No. 42) • IPDM E/R harness connector F10

• Harness for open or short between ECM and battery

>> Repair or replace harness or connectors.

3.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

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

NO >> Repair or replace harness or connectors.

4.PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3. Touch “ERASE”.

4. Perform DTC CONFIRMATION PROCEDURE.

See EC-862, "DTC Logic".

1. Turn ignition switch ON.

2. Select Service $04 with GST.

3. Perform DTC CONFIRMATION PROCEDURE.

See EC-862, "DTC Logic".

Is the 1st trip DTC P0603 displayed again? YES >> GO TO 5.

NO >> INSPECTION END

5.REPLACE ECM

1. Replace ECM.

2. Go to EC-563, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement".

>> INSPECTION END

    P0550 PSP Sensor
    Description Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load. This sensor is a potentiometer which transforms the pow ...

    P0605 ECM
    Description The ECM consists of a microcomputer and connectors for signal input and output and for power supply. The ECM controls the engine. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION P ...

    Other materials:

    CVT Fluid
    Inspection CHECKING CVT FLUID Fluid level should be checked with the fluid warmed up to 50 to 80°C (122 to 176°F). The fluid level check procedure is as follows: 1. Check for fluid leakage. 2. With the engine warmed up, drive the vehicle in an urban area. When ambient temperature is 20 ...

    Horn
    Description Horn (high/low) is located inside of front bumper and operates when theft warning system is in alarm phase. Component Function Check 1.CHECK FUNCTION 1. Select HORN in “ACTIVE TEST” mode with CONSULT-III. 2. Check the horn (high/low) operation. Is the operation normal? ...

    P0133 A/F Sensor 1
    Description The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element. The sensor is capable of precise measurement = 1, but also in the lean and ...