Nissan Terrano model r20 series 2004. Instruction — part 167
Wiring Diagram
YEC676A
DTC P0120 ACCEL POS SENSOR
TD27Ti
EC-390
Diagnostic Procedure
ACCELERATOR POSITION SENSOR
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect accelerator work unit har-
ness connector.
3. Turn ignition switch to “ON” position.
4. Check voltage between accelerator
work unit connector terminal
q
2
and
engine ground with CONSULT-II or
tester.
Voltage: Approximately 5V
OK
E
NG
Check the following:
I
Harness for open or
short-circuit between
ECM and accelerator
work unit.
If NG, repair harness or
connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Loosen and retighten engine ground
screws.
3. Check harness continuity between
accelerator work unit connector termi-
nal
q
4
and ECM connector terminal
434
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open-circuit
between ECM and
accelerator work unit
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM terminal
425
and accelerator
position sensor connector terminal
q
3
.
Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT
(Accelerator position sensor).
Refer to “COMPONENT INSPECTION” on
page EC-394.
OK
E
NG
Replace accelerator pedal
assembly.
Disconnect and reconnect harness con-
nectors in the circuit. 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
NEF700
NEF591
YEC698A
H
H
H
H
H
H
H
DTC P0120 ACCEL POS SENSOR
TD27Ti
EC-391
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-392
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-394.
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-393
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