Page 1145 of 3189
Wiring DiagramNJEC0684
YEC012A
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 ACCEL POS SENSORYD
Wiring Diagram
EC-91
Page 1146 of 3189
Diagnostic ProcedureNJEC0685
1 CHECK ACCELERATOR POSITION SENSOR FUNCTION
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “ACCEL POS SEN” in “DATA MONITOR” mode with CONSULT-II.
3. Check “ACCEL POS SEN” signal under the following conditions.
SEF436Z
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 434 and ground under the following conditions.
SEF437Z
OK or NG
OK GO TO 2.
NG GO TO 3.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure
EC-92
Page 1147 of 3189
2 CHECK ACCELERATOR POSITION SWITCH FUNCTION
With CONSULT-II
1. Select “OFF ACCEL SW” in “DATA MONITOR” mode with CONSULT-II.
2. Check “OFF ACCEL SW” signal under the following conditions.
SEF910Y
Without CONSULT-II
Check voltage between ECM terminal 435 and ground under the following conditions.
SEF911Y
OK or NG
OK GO TO 16.
NG GO TO 11.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-93
Page 1148 of 3189
3 CHECK ACCELERATOR POSITION SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
SEF886Y
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminal 5 and ground with CONSULT-II or tester.
SEF897Y
OK or NG
OK GO TO 5.
NG GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair harness or connectors.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-94
Page 1149 of 3189

5 CHECK ACCELERATOR POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screw.
SEF380Y
3. Check harness continuity between accelerator work unit terminal 4 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 7.
NG GO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
7 CHECK ACCELERATOR POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 434 and accelerator workunit terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 9.
NG GO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-95
Page 1150 of 3189
9 CHECK ACCELERATOR POSITION SENSOR
With CONSULT-II
1. Reconnect all disconnected harness connectors.
2. Turn ignition switch “ON”.
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check the indication of “ACCEL POS SEN” under the following conditions.
SEF436Z
OK or NG
OK GO TO 16.
NG Replace accelerator pedal assembly.
10 CHECK ACCELERATOR POSITION SENSOR
Without CONSULT-II
1. Reconnect all disconnected harness connectors.
2. Turn ignition switch “ON”.
3. Check voltage between ECM terminal 434 and ground under the following conditions.
SEF437Z
OK or NG
OK GO TO 16.
NG Replace accelerator pedal assembly.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-96
Page 1151 of 3189

11 CHECK ACCELERATOR POSITION SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
SEF886Y
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminal 3 and ground with CONSULT-II or tester.
SEF912Y
OK or NG
OK GO TO 13.
NG GO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M74, F112
Harness for open or short between accelerator work unit and ECM
Repair harness or connectors.
13 CHECK ACCELERATOR POSITION SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between accelerator work unit terminal 1 and ECM terminal 426. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 15.
NG GO TO 14.
14 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M74, F112
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-97
Page 1152 of 3189
15 CHECK ACCELERATOR POSITION SWITCH
Check continuity between accelerator position switch terminals 1 and 3 under the following conditions.
SEF913Y
OK or NG
OK GO TO 16.
NG Replace accelerator pedal assembly.
16 CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
INSPECTION END
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-98