2001 NISSAN PICK-UP engine

SEF058Y
PROCEDURE FOR DTC P0102NEEC1552S02With CONSULT-II
1) Turn ignition switch ON.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and wait 5 seconds at most.
4) If 1st trip DTC is detected, go to ªDiagnostic Procedureº,
EC-3155.
With GST
Follow the procedure ªWith CONSULT-IIº.
NOTE:
If 1st trip DTC is confirmed after more than 5 seconds, there may
be malfunction C.
DTC P0102, P0103 MAF SENSORKA24DE (EURO OBD)
DTC Confirmation Procedure
EC-3153

Diagnostic ProcedureNEEC1555
1 INSPECTION START
Which malfunction (P0102, P0103) is duplicated?
P0102 or P0103
P0103©GO TO 3.
P0102©GO TO 2.
2 CHECK INTAKE SYSTEM
Check the followings for connection.
+Air duct
+Air cleaner
+Vacuum hoses
+Intake air passage between air duct to collector
OK or NG
OK©GO TO 3.
NG©Reconnect the parts.
3 RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
SEC309D
©GO TO 4.
DTC P0102, P0103 MAF SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3155

8 CHECK MASS AIR FLOW SENSOR
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Start engine and warm it up to normal operating temperature.
4. Check voltage between ECM terminal 54 (mass air flow sensor signal) and ground.
SEF326V
MTBL0326
5. If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again. Repeat
above check.
6. 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 P0102, P0103 MAF SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3158

SEF329V
Component DescriptionNEEC0066The 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 ValueNEEC1556
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 LogicNEEC0067
DTC
No.Trouble diagno-
sis nameDTC detecting condition Possible cause
P0112
0112Intake air tem-
perature sensor
circuit low inputAn excessively low voltage from the sensor is
sent to ECM.+Harness or connectors
(The sensor circuit is open or shorted.)
+Intake air temperature sensor
P0113
0113Intake air tem-
perature sensor
circuit high inputAn excessively high voltage from the sensor is
sent to ECM.
DTC P0112, P0113 IAT SENSORKA24DE (EURO OBD)
Component Description
EC-3160

FAIL-SAFE MODENEEC0067S01When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
Engine operating condition in fail-safe mode
The ECM functions on the assumption that the intake air temperature is 25ÉC (77ÉF).
DTC Confirmation ProcedureNEEC0068NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch OFF and wait at least 5 seconds before
conducting the next test.
SEF058Y
With CONSULT-II
1) Turn ignition switch ON.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
4) If 1st trip DTC is detected, go to ªDiagnostic Procedureº,
EC-3163.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0112, P0113 IAT SENSORKA24DE (EURO OBD)
On Board Diagnosis Logic
EC-3161

Diagnostic ProcedureNEEC0070
1 CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect intake air temperature sensor harness connector.
SEF329V
3. Turn ignition switch ON.
4. Check voltage between terminal 2 and ground with CONSULT-II or tester.
SEC271D
Voltage: Approximately 5V
OK or NG
OK©GO TO 3.
NG©GO TO 2.
2 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E101, M5
+Harness for open or short between ECM and intake air temperature sensor
©Repair harness or connectors.
3 CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between intake air temperature sensor terminal 1 and engine ground. Refer to the Wiring Dia-
gram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK©GO TO 5.
NG©GO TO 4.
DTC P0112, P0113 IAT SENSORKA24DE (EURO OBD)
Diagnostic Procedure
EC-3163

SEF594K
Component DescriptionNEEC0072The engine coolant temperature sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the
engine coolant temperature input. The sensor uses a thermistor
which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.
SEF012P

Engine coolant temperature
ÉC (ÉF)Voltage*
VResistance
kW
þ10 (14) 4.4 7.0 - 11.4
20 (68) 3.5 2.1 - 2.9
50 (122) 2.2 0.68 - 1.00
90 (194) 0.9 0.236 - 0.260
*: These data are reference values and are measured between ECM terminal 59
(Engine coolant 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.
CONSULT-II Reference Value in Data Monitor
Mode
NEEC0073
MONITOR ITEM CONDITION SPECIFICATION
COOLAN TEMP/S+Engine: After warming up More than 70ÉC (158ÉF)
ECM Terminals and Reference ValueNEEC1557
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
43 B Sensors' ground[Engine is running]
+Idle speedApproximately 0V
59 LG/REngine coolant tempera-
ture sensor[Engine is running]Approximately 0 - 4.8V
Output voltage varies with
engine coolant tempera-
ture.
DTC P0117, P0118 ECT SENSORKA24DE (EURO OBD)
Component Description
EC-3165

On Board Diagnosis LogicNEEC0074
DTC No.Trouble diag-
nosis nameDTC detecting condition Possible cause
P0117
0117Engine cool-
ant tempera-
ture sensor
circuit low
inputAn excessively low voltage from the sensor is sent
to ECM.+Harness or connectors
(The sensor circuit is open or shorted.)
+Engine coolant temperature sensor
P0118
0118Engine cool-
ant tempera-
ture sensor
circuit high
inputAn excessively high voltage from the sensor is sent
to ECM.
FAIL-SAFE MODENEEC0074S01When the malfunction is detected, the ECM enters fail-safe mode and the MI lights up.
Detected items Engine operating condition in fail-safe mode
Engine coolant tempera-
ture sensor circuitEngine coolant temperature will be determined by ECM based on the time after turning ignition switch
to ON or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
ConditionEngine coolant temperature decided (CONSULT-II
display)
Just as ignition switch is turned to ON or Start 40ÉC (104ÉF)
More than approx. 4 minutes after ignition ON or
Start80ÉC (176ÉF)
Except as shown above40 - 80ÉC (104 - 176ÉF)
(Depends on the time)
SEF058Y
DTC Confirmation ProcedureNEEC0075NOTE:
If ªDTC Confirmation Procedureº has been previously conducted,
always turn ignition switch OFF and wait at least 5 seconds before
conducting the next test.
With CONSULT-II
1) Turn ignition switch ON.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 5 seconds.
4) If 1st trip DTC is detected, go to ªDiagnostic Procedureº,
EC-3168.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0117, P0118 ECT SENSORKA24DE (EURO OBD)
On Board Diagnosis Logic
EC-3166