Infiniti FX35 / FX45. Manual — part 415

DTC P0603 ECM POWER SUPPLY

EC-421

< SERVICE INFORMATION >

[VQ35DE]

C

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EC

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1.

Replace ECM.

2.

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

BL-187, "ECM Re-Communicating Function"

.

3.

Perform

EC-84, "VIN Registration"

.

4.

Perform

EC-85, "Accelerator Pedal Released Position Learning"

.

5.

Perform

EC-85, "Throttle Valve Closed Position Learning"

.

6.

Perform

EC-85, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-422

< SERVICE INFORMATION >

[VQ35DE]

DTC P0605 ECM

DTC P0605 ECM

Component Description

INFOID:0000000001326267

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

INFOID:0000000001326268

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

INFOID:0000000001326269

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

1.

Turn ignition switch ON.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to

EC-423, "Diagnosis Procedure"

.

PROCEDURE FOR MALFUNCTION B

With CONSULT-III

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.

4.

If 1st trip DTC is detected, go to

EC-423, "Diagnosis Procedure"

.

PROCEDURE FOR MALFUNCTION C

With CONSULT-III

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.

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 ICC operation.
• ECM deactivates ASCD operation.

DTC P0605 ECM

EC-423

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

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A

EC

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3.

Repeat step 2 for 32 times.

4.

Check 1st trip DTC.

5.

If 1st trip DTC is detected, go to

EC-423, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326270

1.

INSPECTION START

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See

EC-422, "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-422, "DTC Confirmation Procedure"

.

4.

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> GO TO 2.

No

>> INSPECTION END

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-187, "ECM Re-Communicating Function"

.

3.

Perform

EC-84, "VIN Registration"

.

4.

Perform

EC-85, "Accelerator Pedal Released Position Learning"

.

5.

Perform

EC-85, "Throttle Valve Closed Position Learning"

.

6.

Perform

EC-85, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-424

< SERVICE INFORMATION >

[VQ35DE]

DTC P0643 SENSOR POWER SUPPLY

DTC P0643 SENSOR POWER SUPPLY

On Board Diagnosis Logic

INFOID:0000000001326271

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

DTC Confirmation Procedure

INFOID:0000000001326272

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V at idle.

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

3.

If DTC is detected, go to

EC-426, "Diagnosis Procedure"

.

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

P0643
0643

Sensor power supply
circuit short

ECM detects a voltage of power source for
sensor is excessively low or high.

• Harness or connectors

(APP sensor 1 circuit is shorted.)
(PSP sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is short-
ed.)
(EVAP control system pressure sensor circuit
is shorted.)

• Accelerator pedal position sensor

(APP sensor 1)

• EVAP control system pressure sensor
• Power steering pressure sensor
• Refrigerant pressure sensor

Engine operation condition in fail-safe mode

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