2001 NISSAN PICK-UP Repair Manual

Component Description
The charge air pressure sensor detects pressure of the turbo-
charger air. The sensor output voltage to the ECM increases as
pressure increases. The charge air pressure sensor is not used
to control the engine system under normal conditions.
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)
46 P/LCharge air pressure sen-
sorEngine is running.
Warm-up condition
Idle speedApproximately 2.7V
On Board Diagnosis Logic
Malfunction is detected when ... Check Items (Possible Cause)
+An excessively high or low voltage from the sensor is sent to
ECM.+Harness or connectors
(The sensor circuit is open or shorted.)
+Charge air pressure sensor
SEF340VA
SEC249D
DTC 0905 TURBO PRESSUREYD25DDTi
EC-3600

DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 1 second.
4) If DTC is detected, go to ªDiagnostic Procedureº, EC-3604.
WITHOUT CONSULT-II
1) Turn ignition switch ªONº and wait at least 1 second.
2) Turn ignition switch ªOFFº, wait at least 5 seconds and then
turn ªONº.
3) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º
with ECM.
4) If DTC is detected, go to ªDiagnostic Procedureº, EC-3604.SEF817Y
DTC 0905 TURBO PRESSUREYD25DDTi
EC-3601

Wiring Diagram
GEC283A
DTC 0905 TURBO PRESSUREYD25DDTi
EC-3602

Diagnostic Procedure
1 CHECK CHARGE AIR PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Stop engine.
2. Disconnect charge air pressure sensor harness connector.
SEC234D
3. Turn ignition switch ªONº.
4. Check voltage between charge air pressure sensor terminal 1 and ground with CONSULT-II or tester.
SEF306Z
OK or NG
OKcGO TO 2.
NGcRepair harness or connectors.
2 CHECK CHARGE AIR PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between charge air pressure sensor terminal 3 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OKcGO TO 3.
NGcRepair open circuit or short to ground or short to power in harness or connectors.
3 CHECK CHARGE AIR PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 46 and charge air pressure sensor terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 4.
NGcRepair open circuit or short to ground or short to power in harness or connectors.
DTC 0905 TURBO PRESSUREYD25DDTi
EC-3603

4 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 5.
NGcReplace charge air pressure sensor.
5 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3469.
cINSPECTION END
DTC 0905 TURBO PRESSUREYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3604

Description
SYSTEM DESCRIPTION
Sensor Input Signal to ECM ECM Function Actuator
Electronic controlled fuel injection pump Fuel injection signal
EGR volume
controlEGR volume control valve Crankshaft position sensor (TDC) Engine speed
Vehicle speed sensor Vehicle speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Accelerator position sensor Accelerator position
Battery Battery voltage
Air conditioner switch Air conditioner operation
PNP switch Park/Neutral position signal
Barometric pressure sensor (Built into
ECM)Barometric pressure
This system controls flow rate of EGR led from exhaust manifold
to intake manifold. The opening of the EGR by-pass passage in
the EGR volume control valve changes to control the flow rate.
A built-in step motor moves the valve in steps corresponding to
the ECM output pulses. The opening of the valve varies for opti-
mum engine control. The optimum value stored in the ECM is
determined by considering various engine conditions.
The EGR volume control valve remains close under the follow-
ing conditions.
+Engine stopped
+Engine starting
+Low engine coolant temperature
+Excessively high engine coolant temperature
+High engine speed
+Wide open throttle
+Low battery voltage
+Low barometric pressure
SEF908Y
DTC 1003 EGR VOLUME CONT/VYD25DDTi
EC-3605

COMPONENT DESCRIPTION
EGR volume control valve
The EGR volume control valve uses a step motor to control the
flow rate of EGR from exhaust manifold. This motor has four
winding phases. It operates according to the output pulse signal
of the ECM. Two windings are turned ON and OFF in sequence.
Each time an ON pulse is issued, the valve opens or closes,
changing the flow rate. When no change in the flow rate is
needed, the ECM does not issue the pulse signal. A certain
voltage signal is issued so that the valve remains at that particu-
lar opening.
CONSULT-II Reference Value in Data Monitor
Mode
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
EGR VOL CON/V+Engine: After warming up
+Air conditioner switch: ªOFFº
+Shift lever: Neutral position
+No-loadAfter 1 minute at idle More than 10 steps
Revving engine up to 3,200 rpm
quickly0 step
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)
103
105
109
115GY
OR/B
W/L
SBEGR volume control valveEngine is running.
Warm-up condition
Idle speed0.1 - 14V
DTC Confirmation Procedure
WITH CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Turn ignition switch ªOFFº, and immediately turn ªONº within
1 second.
4) Start engine and let it idle.
5) If DTC is detected, go to ªDiagnostic Procedureº, EC-3610.
WITHOUT CONSULT-II
1) Start engine and warm it up to normal operating temperature.
2) Turn ignition switch ªOFFº, and immediately turn ªONº within
1 second.
3) Start engine and let it idle.
4) Turn ignition switch ªOFFº, wait at least 5 seconds and then
turn ªONº.
5) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º
with ECM.
6) If DTC is detected, go to ªDiagnostic Procedureº, EC-3610.
SEF411Y
SEF817Y
DTC 1003 EGR VOLUME CONT/VYD25DDTi
Description (Cont'd)
EC-3606

Wiring Diagram
LHD MODELS
GEC284A
DTC 1003 EGR VOLUME CONT/VYD25DDTi
EC-3607