Nissan Frontier. Manual - part 671

P060B ECM

EC-1255

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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P060B ECM

DTC Logic

INFOID:0000000010471267

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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 11 V or more with ignition

switch ON.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON (engine stopped) and wait least 10 seconds.

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

3. Turn ignition switch ON.

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

YES

>> Proceed to 

EC-1255, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010471268

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Erase DTC.

3. Perform DTC confirmation procedure. Refer to 

EC-1255, "DTC Logic"

.

Is the 1st trip DTC P060B displayed again?

YES

>> Replace ECM. Refer to 

EC-1072, "Additional Service When Replacing ECM"

.

NO

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P060B

CONTROL MODULE
(Internal control module A/
D processing performance)

ECM internal analog/digital conversion processing 
system is malfunctioning.

ECM

EC-1256

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0643 SENSOR POWER SUPPLY

P0643 SENSOR POWER SUPPLY

On Board Diagnosis Logic

INFOID:0000000009481908

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 illuminates. 

DTC Confirmation Procedure

INFOID:0000000009481909

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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 10V at idle.
1. Start engine and let it idle for 1 second.
2. Check 1st trip DTC.
3. If DTC is detected, go to 

EC-1256, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481910

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

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

EC-1094, "Ground Inspection"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0643
0643

Sensor power supply 
circuit short

ECM detects that the 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.)
(Battery current sensor circuit is shorted.)
(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
• Battery current 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.

BBIA0539E

P0643 SENSOR POWER SUPPLY

EC-1257

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK ACCELERATOR PEDAL POSITION 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 2 and ground with

CONSULT 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-1230, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

EC-1366, "Component Description"

.)

• Battery current sensor (Refer to 

EC-1273, "Component Inspection"

.)

• Power steering pressure sensor (Refer to 

EC-1248, "Component Inspection"

.)

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning component.

5.

CHECK APP SENSOR

Refer to 

EC-1324, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

Voltage: Approximately 5V

BBIA0556E

PBIB2608E

ECM terminal

Sensor terminal

Reference Wiring Diagram

48

EVAP control system pressure sensor terminal 3

EC-1043

49

Refrigerant pressure sensor terminal 3

Battery current sensor terminal 1

68

PSP sensor terminal 3

90

APP sensor terminal 2

EC-1258

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0643 SENSOR POWER SUPPLY

NG

>> GO TO 6.

6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to 

ACC-3, "Component"

.

2. Perform 

EC-1074, "Accelerator Pedal Released Position Learning"

.

3. Perform 

EC-1075, "Throttle Valve Closed Position Learning"

.

4. Perform 

EC-1075, "Idle Air Volume Learning"

.

>> INSPECTION END

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END