Infiniti QX56 (JA60). Manual - part 408

 

  Index      Infiniti     Infiniti QX56 (JA60) - service repair manual 2010 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  406  407  408  409   ..

 

 

Infiniti QX56 (JA60). Manual - part 408

 

 

EC-284

< COMPONENT DIAGNOSIS >

[VK56DE]

P0603 ECM POWER SUPPLY

P0603 ECM POWER SUPPLY

Component Description

INFOID:0000000005149316

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 vol-

ume learning value memory, etc.

On Board Diagnosis Logic

INFOID:0000000005149317

DTC Confirmation Procedure

INFOID:0000000005149318

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

before conducting the next step.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.

Turn ignition switch OFF and wait at least 10 seconds.

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 1 and 2 for 4 times.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to 

EC-284, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149319

1.

CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check voltage between ECM terminal 121 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

PBIB1164E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0603
0603

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

Voltage: Battery voltage

MBIB0026E

P0603 ECM POWER SUPPLY

EC-285

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

• IPDM E/R connector E121

• 20A fuse (No. 53)

• Harness for open or short between ECM and battery

>> Repair or replace harness or connectors.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness or connectors.

4.

PERFORM DTC CONFIRMATION PROCEDURE

 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-284, "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-284, "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

SEC-9, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"

.

3. Perform 

EC-17, "VIN Registration"

.

4. Perform 

EC-18, "Accelerator Pedal Released Position Learning"

.

5. Perform 

EC-18, "Throttle Valve Closed Position Learning"

.

6. Perform 

EC-18, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-286

< COMPONENT DIAGNOSIS >

[VK56DE]

P0605 ECM

P0605 ECM

Component Description

INFOID:0000000005149320

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:0000000005149321

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:0000000005149322

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 perform the following procedure

before conducting the next step.
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.

PROCEDURE FOR MALFUNCTION A

1. Turn ignition switch ON.

2. Check 1st trip DTC.

3. If 1st trip DTC is detected, go to 

EC-287, "Diagnosis Procedure"

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.

4. If 1st trip DTC is detected, go to 

EC-287, "Diagnosis Procedure"

.

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.

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.

P0605 ECM

EC-287

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Repeat step 2 for 32 times.

4. Check 1st trip DTC.

5. If 1st trip DTC is detected, go to 

EC-287, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149323

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-286, "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-286, "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

SEC-9, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"

.

3. Perform 

EC-17, "VIN Registration"

.

4. Perform 

EC-18, "Accelerator Pedal Released Position Learning"

.

5. Perform 

EC-18, "Throttle Valve Closed Position Learning"

.

6. Perform 

EC-18, "Idle Air Volume Learning"

.

>> INSPECTION END

 

 

 

 

 

 

 

Content   ..  406  407  408  409   ..