Infiniti QX56 (JA60). Manual - part 409

 

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Infiniti QX56 (JA60). Manual - part 409

 

 

EC-288

< COMPONENT DIAGNOSIS >

[VK56DE]

P0607 ECM

P0607 ECM

Description

INFOID:0000000005149324

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

INFOID:0000000005149325

This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

INFOID:0000000005149326

1. Turn ignition switch ON.
2. Check DTC.
3. If DTC is detected, go to 

EC-288, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149327

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-288, "DTC Confirmation Procedure"

.

5. Is the DTC P0607 displayed again?

 With GST

1. Turn ignition switch ON.

2. Select Service $04 with GST.

3. Perform DTC Confirmation Procedure.

See 

EC-288, "DTC Confirmation Procedure"

.

4. Is the DTC P0607 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

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0607
0607

CAN communication bus

When detecting error during the initial diagno-
sis of CAN controller of ECM.

• ECM

P0643 SENSOR POWER SUPPLY

EC-289

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0643 SENSOR POWER SUPPLY

On Board Diagnosis Logic

INFOID:0000000005149328

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:0000000005149329

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.
TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

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

2. Check DTC.

3. If DTC is detected, go to 

EC-289, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149330

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body.

Refer to 

EC-85, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

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.)
(Battery current sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is short-
ed.)
(EVAP control system pressure sensor circuit 
is shorted.)

• Accelerator pedal position sensor
• Power steering pressure sensor
• Refrigerant pressure sensor
• EVAP control system 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.

BBIA0354E

EC-290

< COMPONENT DIAGNOSIS >

[VK56DE]

P0643 SENSOR POWER SUPPLY

NG

>> Repair or replace ground connections.

2.

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect accelerator pedal position (APP) sensor harness

connector.

2. Turn ignition switch ON.

3. Check voltage between APP sensor terminal 7 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals

OK or NG

OK

>> GO TO 4.

NG

>> Repair short to ground or short to power in harness or connectors.

4.

CHECK COMPONENTS

Check the following.

• EVAP control system pressure sensor (Refer to 

EC-248, "Component Inspection"

.)

• Power steering pressure sensor (Refer to 

EC-283, "Component Inspection"

.)

• Battery current sensor (Refer to 

EC-314, "Component Inspection"

.)

• Refrigerant pressure sensor
OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning components.

5.

CHECK ACCELERATOR PEDAL POSITION SENSOR

Refer to 

EC-381, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

BBIA0361E

Voltage: Approximately 5 V

JMBIA0601ZZ

ECM terminal

Sensor terminal

Reference Wiring Diagram

48

EVAP control system pressure sensor terminal 3

EC-435, "Wiring Diagram - ENGINE 

CONTROL SYSTEM -"

49

Refrigerant pressure sensor terminal 1

Battery current sensor terminal 1

68

Power steering pressure sensor terminal 1

90

APP sensor terminal 7

P0643 SENSOR POWER SUPPLY

EC-291

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal position assembly.

2. Perform 

EC-18, "Accelerator Pedal Released Position Learning"

.

3. Perform 

EC-18, "Throttle Valve Closed Position Learning"

.

4. Perform 

EC-18, "Idle Air Volume Learning"

.

>> INSPECTION END

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

 

 

 

 

 

 

 

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