Infiniti QX4 (R50). Manual — part 179
8
CHECK THROTTLE POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 91 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 (With CONSULT-II)
©
GO TO 9.
OK (Without CONSULT-
II)
©
GO TO 10.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
9
CHECK THROTTLE POSITION SENSOR
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine (ignition switch OFF).
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than –40.0kPa (–300mmHg, –11.81inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
SEF793W
6. Turn ignition switch ON.
7. Select “DATA MONITOR” mode with CONSULT-II.
8. Check voltage of “THRTL POS SEN” under the following conditions.
Voltage measurement must be made with throttle position sensor installed in vehicle.
SEF062Y
OK or NG
OK
©
GO TO 12.
NG
©
GO TO 11.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-183
10
CHECK THROTTLE POSITION SENSOR
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine (ignition switch OFF).
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81 inHg)] until the throttle drum becomes free from the rod of
the throttle opener.
SEF793W
6. Turn ignition switch ON.
7. Check voltage between ECM terminal 91 (Throttle position sensor signal) and ground.
Voltage measurement must be made with throttle position sensor installed in vehicle.
MTBL0231
OK or NG
OK
©
GO TO 12.
NG
©
GO TO 11.
11
ADJUST CLOSED THROTTLE POSITION SWITCH
Adjust closed throttle position switch. Refer to “Basic Inspection”, EC-101.
MTBL0655
OK or NG
OK
©
GO TO 12.
NG
©
Replace throttle position sensor. To adjust it, perform “Basic Inspection”, EC-101.
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-184
12
CHECK MASS AIR FLOW SENSOR
1. Reconnect harness connectors disconneted.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 61 (Mass air flow sensor signal) and ground.
SEF298X
4. If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again.
Then repeat above check.
OK or NG
OK
©
GO TO 13.
NG
©
Replace mass air flow sensor.
13
CHECK CRANKSHAFT POSITION SENSOR (POS)
1. Install all removed parts.
2. Perform “DTC Confirmation Procedure” for DTC P0335 and P1336. Refer to EC-336, 519.
OK or NG
OK
©
GO TO 14.
NG
©
Replace crankshaft position sensor (POS).
14
CHECK CRANKSHAFT POSITION SENSOR (REF)
Perform “DTC Confirmation Procedure” for DTC P1335. Refer to EC-511.
OK or NG
OK
©
GO TO 15.
NG
©
Replace crankshaft position sensor (REF).
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-185
15
CHECK FUEL INJECTOR
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
SEF964XC
OK or NG
OK
©
GO TO 16.
NG
©
Replace fuel injector.
16
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-186
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