Infiniti M35/M45 Y50. Manual - part 679

DTC P0603 ECM POWER SUPPLY

EC-1189

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4. 

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-1186, "DTC Confirmation Procedure"

 .

5.

Is the 1st trip DTC P0603 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-1186, "DTC Confirmation Procedure"

 .

4.

Is the 1st trip DTC P0603 displayed again?

Yes or No

Yes

>> GO TO 5.

No

>> INSPECTION END

5. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-248, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-787, "VIN Registration"

 .

4.

Perform 

EC-788, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-788, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-788, "Idle Air Volume Learning"

 .

>> INSPECTION END

EC-1190

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DTC P0605 ECM

DTC P0605 ECM

PFP:23710

Component Description

NBS005JU

The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.

On Board Diagnosis Logic

NBS005JV

This self-diagnosis has one or two trip detection logic.

FAIL-SAFE MODE

ECM enters fail-safe mode when the malfunction A is detected.

DTC Confirmation Procedure

NBS005JW

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION
B, perform PROCEDURE FOR MALFUNCTION C.

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

PROCEDURE FOR MALFUNCTION A

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If 1st trip DTC is detected, go to 

EC-1191, "Diagnostic Proce-

dure"

 .

 With GST

Follow the procedure “With CONSULT-II” above.

PBIB1164E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605
0605

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.

Detected items

Engine operation condition in fail-safe mode

Malfunction A

●

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 
5 degrees) by the return spring.

●

ECM deactivates ASCD operation.

SEF058Y

DTC P0605 ECM

EC-1191

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PROCEDURE FOR MALFUNCTION B

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

If 1st trip DTC is detected, go to 

EC-1191, "Diagnostic Proce-

dure"

 .

 With GST

Follow the procedure “With CONSULT-II” above.

PROCEDURE FOR MALFUNCTION C

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

Repeat step 3 for 32 times.

5.

If 1st trip DTC is detected, go to 

EC-1191, "Diagnostic Proce-

dure"

 .

 With GST

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

NBS005JX

1. 

INSPECTION START

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-1190, "DTC Confirmation Procedure"

 .

5.

Is the 1st trip DTC P0605 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-1190, "DTC Confirmation Procedure"

 .

4.

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> GO TO 2.

No

>> INSPECTION END

SEF058Y

SEF058Y

EC-1192

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DTC P0605 ECM

2. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-248, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-787, "VIN Registration"

 .

4.

Perform 

EC-788, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-788, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-788, "Idle Air Volume Learning"

 .

>> INSPECTION END