2001 NISSAN PICK-UP check engine

4 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E236, M278 (LHD models)
+Harness connectors E236, F35 (RHD models)
+Harness for open or short between electronic control fuel injection pump and engine ground
cRepair open circuit or short to ground or short to power in harness or connectors.
5 CHECK COMMUNICATION LINE FOR OPEN AND SHORT
1. Check continuity between the following terminals. Refer to Wiring Diagram.
MTBL0444
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 7.
NGcGO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E237, M279 (LHD models)
+Harness connectors E237, F36 (RHD models)
+Harness for open or short between electronic control fuel injection pump and ECM
cRepair open circuit or short to ground or short to power in harness or connectors.
7 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3469.
OK or NG
OKcReplace electronic control fuel injection pump.
NGcRepair open circuit or short to ground or short to power in harness or connectors.
DTC 0402 P9zFUEL TEMP SENYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3514

ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the
ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
23 WAccelerator position sen-
sorIgnition switch ªONº
Accelerator pedal fully released0.29 - 0.79V
Ignition switch ªONº
Accelerator pedal fully depressed3.48 - 4.64V
31 YAccelerator position switch
(Idle)Ignition switch ªONº
Accelerator pedal fully releasedBATTERY VOLTAGE
(11 - 14V)
Ignition switch ªONº
Accelerator pedal depressedApproximately 0V
32 GAccelerator position switch
(Full)Ignition switch ªONº
Accelerator pedal releasedApproximately 0V
Ignition switch ªONº
Accelerator pedal fully depressedBATTERY VOLTAGE
(11 - 14V)
48 OR/LAccelerator position sen-
sor power supplyIgnition switch ªONº
Approximately 5V
51 B/WAccelerator position sen-
sor groundEngine is running.
Warm-up condition
Idle speedApproximately 0V
On Board Diagnosis Logic
Malfunction is detected when ... Check Items (Possible Cause)
+The relation between sensor and switch signal is not in the
normal range during the specified accelerator position.+Harness or connectors
(The sensor circuit is open or shorted.)
+Accelerator position sensor
+Accelerator position switch
DTC 0403 ACCEL POS SENSORYD25DDTi
EC-3516

5 CHECK ACCELERATOR POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Loosen and retighten engine ground screw.
SEC245D
3. Check harness continuity between accelerator work unit terminal 3 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 7.
NGcGO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors F54, M48 (RHD models)
+Harness for open or short between ECM and accelerator work unit
cRepair open circuit or short to ground or short to power in harness or connectors.
7 CHECK ACCELERATOR POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 23 and accelerator work unit terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK (With CONSULT-II)cGO TO 9.
OK (Without CONSULT-II)cGO TO 10.
NGcGO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors F55, M47 (RHD models)
+Harness for open or short between ECM and accelerator work unit
cRepair open circuit or short to ground or short to power in harness or connectors.
DTC 0403 ACCEL POS SENSORYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3525

11 CHECK ACCELERATOR POSITION SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between harness connector F55 terminal 13 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK (With CONSULT-II)cGO TO 13.
OK (Without CONSULT-II)cGO TO 14.
NGcGO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M47, F55
+Harness for open or short between harness connector F55 and engine ground
cRepair harness or connectors.
13 RESET ACCELERATOR POSITION SENSOR IDLE POSITION MEMORY
With CONSULT-II
1. Turn ignition switch ªONº.
2. Select ªOFF ACCEL PO SIGº in ªACTIVE TESTº mode with CONSULT-II.
3. Touch ªCLEARº.
cGO TO 24.
14 RESET ACCELERATOR POSITION SENSOR IDLE POSITION MEMORY
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Let engine idle for 10 minutes.
cGO TO 24.
DTC 0403 ACCEL POS SENSORYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3527

22 RESET ACCELERATOR POSITION SENSOR IDLE POSITION MEMORY
With CONSULT-II
1. Reconnect all connectors disconnected.
2. Turn ignition switch ªONº.
3. Select ªOFF ACCEL PO SIGº in ªACTIVE TESTº mode with CONSULT-II.
4. Touch ªCLEARº.
cGO TO 24.
23 RESET ACCELERATOR POSITION SENSOR IDLE POSITION MEMORY
Without CONSULT-II
1. Reconnect all connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Let engine idle for 10 minutes.
cGO TO 24.
24 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3469.
cINSPECTION END
DTC 0403 ACCEL POS SENSORYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3530

On Board Diagnosis Logic
Malfunction is detected when ... Check Items (Possible Cause)
+An excessively high voltage from the charge air pressure sen-
sor is sent to ECM when engine is running.+Intake air system
+Turbocharger system
+Charge air pressure sensor
+Harness or connectors
(The charge air pressure sensor circuit is shorted.)
DTC Confirmation Procedure
NOTE:
If DTC 0406 ªINT AIR VOLº displayed with DTC 0905
ªTURBO PRESSUREº, perform trouble diagnosis for DTC
0905 ªTURBO PRESSUREº first. (See EC-3601.)
WITH CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and warm it up to normal operating temperature.
4) Drive vehicle.
5) Maintain the engine speed more than 4,000 rpm for at least
10 seconds.
6) If DTC is detected, go to ªDiagnostic Procedureº, EC-3533.
WITHOUT CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Drive vehicle.
3) Maintain the engine speed more than 4,000 rpm for at least
10 seconds.
4) Stop vehicle.
5) Turn ignition switch ªOFFº, wait at least 5 seconds and then
turn ªONº.
6) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º
with ECM.
7) If DTC is detected, go to ªDiagnostic Procedureº, EC-3533.SEF817Y
DTC 0406 INT AIR VOLYD25DDTi
EC-3531

Diagnostic Procedure
1 CHECK INTAKE AIR SYSTEM
Listen for an intake air leak and clogging after the intake air temperature sensor.
OK or NG
OKcGO TO 2.
NGcRepair or replace.
2 CHECK CHARGE AIR PRESSURE SENSOR
1. Remove charge air pressure sensor with its harness connector connected.
2. Turn ignition switch ªONº.
3. Use pump to apply pressure to charge air pressure sensor as shown in the figure.
CAUTION:
+Always calibrate the pressure pump gauge when using it.
+Inspection should be done at room temperature [10 - 30ÉC (50 - 86ÉF)].
4. Check the output voltage between charge air pressure sensor terminal 2 and engine ground.
SEF449Z
OK or NG
OKcGO TO 3.
NGcReplace charge air pressure sensor.
3 CHECK TURBOCHARGER OVERALL FUNCTION
1. Start engine and let it idle.
2. Make sure that turbocharger wastegate valve control actuator rod moves when revving engine up to 3,000 rpm and returning to
idle.
SEC255D
OK or NG
OKcGO TO 4.
NGcRefer to EM section, ªTurbocharger inspectionº.
DTC 0406 INT AIR VOLYD25DDTi
EC-3532

On Board Diagnosis Logic
Malfunction is detected when ... Check Items (Possible Cause)
+An improper signal from the sensor is sent to ECM during
engine running and cranking.+Harness or connectors
(The sensor circuit is open.)
+Crankshaft position sensor (TDC)
DTC Confirmation Procedure
Before performing the following procedure, confirm that
battery voltage is more than 10V.
WITH CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº
mode with CONSULT-II.
2) Crank engine for at least 1 second.
3) Start engine and run it for at least 2 seconds at idle speed.
4) If DTC is detected, go to ªDiagnostic Procedureº, EC-3538.
WITHOUT CONSULT-II
1) Crank engine for at least 1 second.
2) Start engine and run it for at least 2 seconds at idle speed.
3) Turn ignition switch ªOFFº, wait at least 5 seconds and then
turn ªONº.
4) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º
with ECM.
5) If DTC is detected, go to ªDiagnostic Procedureº, EC-3538.
SEF817Y
DTC 0407 CRANK POS SEN (TDC)YD25DDTi
EC-3535