Nissan Note E12. Manual - part 227

P0603 ECM POWER SUPPLY

EC-247

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

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P0603 ECM POWER SUPPLY

Description

INFOID:0000000009022593

ECM has the memory function of the DTC memory, the air-fuel ratio

feedback compensation value memory, the Idle Air Volume Learning

value memory, etc. even when the ignition switch is turned OFF.

DTC Logic

INFOID:0000000009022594

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON wait at least 10 seconds.

2. Turn ignition switch OFF and wait at least 5 minutes

3. Turn ignition switch ON, wait at least 10 seconds.

4. Repeat step 2 and 3 for five times.

5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-247, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009022595

1.

INSPECTION START

1. Erase DTC.

2. Perform DTC CONFIRMATION PROCEDURE.

See 

EC-247, "DTC Logic"

.

Is the 1st trip DTC P0603 displayed again?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

REPLACE ECM

1. Replace ECM. Refer to 

EC-338, "Removal and Installation"

.

PBIA9222J

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0603

ECM BACK UP/CIRCUIT
(ECM power supply circuit)

ECM back-up RAM system 
does not function properly.

• Harness or connectors

[ECM power supply (back up) circuit is open or shorted.]

• ECM

EC-248

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

P0603 ECM POWER SUPPLY

2. Perform 

EC-111, "Work Procedure"

.

>> INSPECTION END

P0605 ECM

EC-249

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

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P0605 ECM

DTC Logic

INFOID:0000000009022596

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

1. Turn ignition switch ON.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-249, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

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

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

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-249, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C

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

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

3. Repeat step 2 for 32 times.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-249, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009022597

1.

INSPECTION START

1. Erase DTC.

2. Perform DTC CONFIRMATION PROCEDURE.

See 

EC-249, "DTC Logic"

.

Is the 1st trip DTC P0605 displayed again?

YES

>> GO TO 2.

NO

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605

Engine control module

A)

ECM calculation function is malfunctioning.

ECM

B)

ECM EEP-ROM system is malfunctioning.

C)

ECM self shut-off function is malfunctioning.

EC-250

< DTC/CIRCUIT DIAGNOSIS >

[HR16DE]

P0605 ECM

2.

REPLACE ECM

1. Replace ECM. Refer to 

EC-338, "Removal and Installation"

.

2. Perform 

EC-111, "Work Procedure"

.

>> INSPECTION END