NISSAN PICK-UP 2001 Repair Manual

Diagnostic ProcedureNEEC1564
1 RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
SEC309D
©GO TO 2.
2 CHECK POWER SUPPLY
1. Disconnect throttle position sensor harness connector.
SEF265S
2. Turn ignition switch ON.
3. Check voltage between terminal 1 and ground with CONSULT-II or tester.
SEF564P
Voltage: Approximately 5V
OK or NG
OK©GO TO 3.
NG©Repair harness or connectors.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3186

3 CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between throttle position sensor terminal 3 and engine ground. Refer to the Wiring Diagram.
SEF565P
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK©GO TO 5.
NG©GO TO 4.
4 DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and throttle position sensor.
©Repair open circuit or short to power in harness or connectors.
5 CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 23 and terminal 2.
Refer to the Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK (With CONSULT-II)©GO TO 6.
OK (Without CONSULT-
II)©GO TO 7.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3187

6 CHECK THROTTLE POSITION SENSOR
With CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Stop engine and turn ignition switch ON.
4. Select ªDATA MONITORº mode with CONSULT-II.
5. Check voltage of ªTHRTL POS SENº under the following conditions.
SEF179Y
NOTE:
Voltage measurement must be made with throttle position sensor installed in vehicle.
MTBL0579
If NG, adjust closed throttle position switch. Refer to ªBasic Inspectionº, EC-3086.
OK or NG
OK (Type B in step 1)©GO TO 8.
OK (Type A or C in step
1)©GO TO 11.
NG©Replace throttle position sensor. To adjust it, perform ªBasic Inspectionº, EC-3086.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3188

7 CHECK THROTTLE POSITION SENSOR
Without CONSULT-II
1. Reconnect all harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Stop engine and turn ignition switch ON.
4. Check voltage between ECM terminal 23 (Throttle position sensor signal) and ground under the following conditions.
SEF767W
NOTE:
Voltage measurement must be made with throttle position sensor installed in vehicle.
MTBL0579
If NG, adjust closed throttle position switch. Refer to ªBasic Inspectionº, EC-3086.
OK or NG
OK (Type B in step 1)©GO TO 8.
OK (Type A or C in step
1)©GO TO 11.
NG©Replace throttle position sensor. To adjust it, perform ªBasic Inspectionº, EC-3086.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3189

8 CHECK MASS AIR FLOW SENSOR
1. Turn ignition switch ON.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 54 (mass air flow sensor signal) and ground.
SEF326V
MTBL0326
4. If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again. Repeat
above check.
5. If NG, remove mass air flow sensor from air duct. Check hot wire for damage or dust.
SEF893J
OK or NG
OK©GO TO 9.
NG©Replace mass air flow sensor.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3190

9 CHECK CAMSHAFT POSITION SENSOR
1. Start engine and warm it up to normal operating temperature.
2. Check voltage between ECM terminals 49 or (44)* and engine ground, ECM terminals 44, 48 or (49, 53)* and engine
ground.
SEC273D
*: Model with NATS (Nissan Anti-Theft System)
OK or NG
OK©GO TO 10.
NG©Replace distributor assembly with camshaft position sensor.
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3191

10 CHECK FUEL INJECTOR
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
SEF836Q
Resistance: 10 - 14W[at 25ÉC (77ÉF)]
OK or NG
OK©GO TO 11.
NG©Replace fuel injector.
11 CHECK SHIELD CIRCUIT
1. Turn ignition switch OFF.
2. Remove joint connector-3.
3. Check the following.
+Continuity between joint connector-3 terminal 2 and ground
+Joint connector-3
(Refer to ªHARNESS LAYOUTº, EL section.)
Continuity should exist.
4. Also check harness for short to power.
5. Then reconnect joint connector.
OK or NG
OK©GO TO 12.
NG©Repair open circuit or short to power in harness or connectors.
12 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3123.
©INSPECTION END
DTC P0122, P0123 TP SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3192

SEF329V
Component DescriptionNEEC1565The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a sig-
nal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
SEF012P

Intake air temperature
ÉC (ÉF)Voltage*
VResistance
kW
20 (68) 3.5 2.1 - 2.9
80 (176) 1.23 0.27 - 0.38
*: These data are reference values and are measured between ECM terminal 61
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
ECM Terminals and Reference ValueNEEC1570
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
43 B Sensors' ground[Engine is running]
+Idle speedApproximately 0V
61 P/BIntake air temperature sen-
sor[Engine is running]Approximately 0 - 4.8V
Output voltage varies with
intake air temperature.
On Board Diagnosis LogicNEEC1566
DTC No. Malfunction is detected when ... Check Items (Possible Cause)
P0127
0127Rationally incorrect voltage from the sensor is sent to
ECM, compared with the voltage signal from engine
coolant temperature sensor.+Harness or connectors
(The sensor circuit is open or shorted.)
+Intake air temperature sensor
DTC P0127 IAT SENSORKA24DE (EURO OBD)
Component Description
EC-3193

DTC Confirmation Procedure=NEEC1567NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch OFF and wait at least 5 seconds before
conducting the next test.
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the
shop or by driving the vehicle. If a road test is expected to be
easier, it is unnecessary to lift the vehicle.
SEF058Y
SEF176Y
With CONSULT-II
1) Wait until engine coolant temperature is less than 90ÉC
(194ÉF).
a) Turn ignition switch ON.
b) Select ªDATA MONITORº mode with CONSULT-II.
c) Check the engine coolant temperature.
d) If the engine coolant temperature is not less than 90ÉC
(194ÉF), turn ignition switch ªOFFº and cool down engine.
+Perform the following steps before engine coolant temperature
is above 90ÉC (194ÉF).
2) Turn ignition switch ON.
3) Select ªDATA MONITORº mode with CONSULT-II.
4) Start engine.
5) Hold vehicle speed more than 70 km/h (43 MPH) for 100 con-
secutive seconds.
6) If 1st trip DTC is detected, go to ªDiagnostic Procedureº,
EC-3195.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0127 IAT SENSORKA24DE (EURO OBD)
DTC Confirmation Procedure
EC-3194

Diagnostic ProcedureNEEC1569
1 CHECK INTAKE AIR TEMPERATURE SENSOR
Check resistance as shown in the figure.
SEC272D
MTBL1306
OK or NG
OK©GO TO 2.
NG©Replace intake air temperature sensor.
2 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3123.
©INSPECTION END
DTC P0127 IAT SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3195