Infiniti G20 (P11). Manual — part 193
Wiring Diagram
NCEC0084
TEC701
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Wiring Diagram
EC-183
Diagnostic Procedure
NCEC0085
1
INSPECTION START
Which malfunction A, B or C is duplicated?
MTBL0066
Type A, B or C
Type A or B
©
GO TO 4.
Type C
©
GO TO 2.
2
ADJUST THROTTLE POSITION SENSOR
Perform “Basic Inspection”, EC-107.
OK or NG
OK
©
GO TO 3.
3
CHECK INTAKE SYSTEM
Check the followings for connection.
I
Air duct
I
Vacuum hoses
I
Intake air passage between air duct to intake manifold collector
OK or NG
OK
©
GO TO 4.
NG
©
Reconnect the parts.
4
RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF839X
©
GO TO 5.
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure
EC-184
5
CHECK POWER SUPPLY
1. Disconnect throttle position sensor harness connector.
SEF837X
2. Turn ignition switch “ON”.
3. Check voltage between throttle position sensor terminal 3 and ground with CONSULT-II or tester.
SEF306X
OK or NG
OK
©
GO TO 6.
NG
©
Repair harness or connectors.
6
CHECK GROUND CIRCUIT
1. Turn ignition switch “OFF”.
2. Check harness continuity between throttle position sensor terminal 1 and engine ground.
SEF210W
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-185
7
DETECT MALFUNCTIONING PART
Check the following.
I
Harness for open or short between ECM and throttle position sensor
I
Harness for open or short between throttle position sensor and TCM (Transmission control module)
©
Repair open circuit or short to power in harness or connectors.
8
CHECK INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 92 and throttle position sensor 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
©
Repair open circuit or short to ground or short to power in harness or connectors.
9
CHECK THROTTLE POSITION SENSOR
Refer to “Component Inspection”, EC-188.
OK or NG
OK (Type B in step1)
©
GO TO 10.
OK (Type A or C in
step1)
©
GO TO 13.
NG
©
Replace throttle position sensor. To adjust it, perform “Basic Inspection”, EC-107.
10
CHECK MASS AIR FLOW SENSOR
Refer to “Component Inspection”, EC-162.
OK or NG
OK
©
GO TO 11.
NG
©
Replace mass air flow sensor.
11
CHECK CAMSHAFT POSITION SENSOR
Refer to “Component Inspection”, EC-346.
OK or NG
OK
©
GO TO 12.
NG
©
Replace camshaft position sensor.
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-186
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