Nissan Terrano r20e. Manual — part 183
ACCELERATOR POSITION SWITCH
The accelerator position switch detects OFF-accelerator switch sig-
nal and Full-accelerator switch signal and sends these signals to
the ECM. The ECM will then determine engine idle conditions.
These signals are also used for diagnosing the accelerator position
sensor.
INSPECTION START
CHECK OVERALL FUNCTION.
With CONSULT-II
1. Turn ignition switch to “ON” position.
2. Select “FULL ACCELL SW” and “OFF
ACCEL SW” in “DATA MONITOR” mode
with CONSULT-II.
3. Check “FULL ACCEL SW” and “OFF
ACCEL SW” signal under the following
conditions.
OFF ACCEL SW:
Accelerator pedal released
— ON
Accelerator pedal depressed
— OFF
FULL ACCEL SW:
Accelerator pedal fully depressed
— ON
Without CONSULT-II
1. Turn ignition switch to “ON” position.
2. Check voltage between ECM terminal
435
and body ground under the following condi-
tions:
Voltage:
Accelerator pedal released
Approximately 0V
Accelerator pedal fully depressed
Approximately 5V
NG
E
OK
INSPECTION END
q
A
MEC969D
MEC955D
H
H
DTC P0120 ACCEL POS SENSOR
TD27Ti
Diagnostic Procedure (Cont’d)
EC-369
q
A
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect accelerator work unit har-
ness connector and ECM harness con-
nector.
3. Check harness continuity between
accelerator work unit terminal
q
3
and
ECM terminal
435
. Refer to wiring
diagram.
Continuity should exist.
Check harness for short-circuit.
OK
E
NG
Check the following:
I
10A fuse in fuse box
I
75A fusible link in fusible
link box
I
Harness continuity
between ECM relay and
battery positive supply
I
Harness for open or
short-circuit between
ECM relay and accelera-
tor position switch.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector.
3. Check harness continuity between
accelerator work unit connector termi-
nal
q
1
and ECM connector terminal
426
. Refer to wiring diagram.
Continuity should exist.
If OK; check harness for short-circuit.
If OK, re-connect harness connectors.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT.
(Accelerator position switch.)
Refer to “COMPONENT INSPECTION” on
page EC-371.
OK
E
NG
Replace accelerator pedal.
Disconnect and reconnect harness con-
nectors in the circuits. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
SEF628S
H
H
H
H
H
H
DTC P0120 ACCEL POS SENSOR
TD27Ti
Diagnostic Procedure (Cont’d)
EC-370
Component Inspection
ACCELERATOR POSITION SENSOR
1. Disconnect accelerator work unit harness connector.
2. Make sure that resistance between terminals
q
2
and
q
4
changes
when opening throttle valve manually.
Throttle valve conditions
Resistance [at 25°C (77°F)]
Completely closed
Approximately 1.2 k
Ω
Partially open
1.2 - 1.9 k
Ω
Completely open
Approximately 1.9 k
Ω
If NG, replace accelerator pedal assembly.
CAUTION
I
Do not disassemble accelerator pedal assembly.
ACCELERATOR POSITION SWITCH
1. Disconnect accelerator work unit harness connector.
2. Check continuity between terminals
q
1
and
q
3
.
Conditions
Continuity
Accelerator pedal released
No
Accelerator pedal depressed
Yes
If NG, replace accelerator pedal assembly.
CAUTION:
I
Do not disassemble accelerator pedal assembly.
MEC960D
MEC961D
DTC P0120 ACCEL POS SENSOR
TD27Ti
EC-371
Component Description
FUEL TEMPERATURE SENSOR (FTS)
The fuel temperature sensor is used to detect the fuel temperature
in the injection pump. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the fuel tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.
The sensor is built into the inside electrical circuit of the injection
pump.
On Board Diagnosis Logic
DTC
Malfunction is detected when ...
Check Items
(Possible Cause)
P0180
0402
I
An excessively high or low voltage from the sensor is
detected by ECM.
I
Harness or connectors
(The sensor circuit is open or short-circuited.)
I
Fuel temperature sensor
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to “ON” position.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 5 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to “ON” position and wait at least 5 sec-
onds.
2) Turn ignition switch to “LOCK” position, wait at least 5 seconds
and then turn to “ON” position.
3) Perform “Diagnostic Test Mode II” (Self-diagnostic results).
DTC P0180 FUEL TEMP SENSOR
TD27Ti
EC-372
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