Infiniti I30 (A33). Manual — part 217
5
CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect throttle position sensor harness connector.
SEC001C
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 open circuit or short to ground or short to power in harness or connectors.
6
CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between sensor terminal 1 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK
©
GO TO 8.
NG
©
GO TO 7.
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 TCM (Transmission Control Module) and throttle position sensor
©
Repair open circuit or short to power in harness or connectors.
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DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-183
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. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT-II.
5. 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.
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. Turn ignition switch ON.
4. 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.
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-184
11
ADJUST CLOSED THROTTLE POSITION SWITCH
Adjust closed throttle position switch. Refer to “Basic Inspection”, EC-109.
MTBL0595
OK or NG
OK
©
GO TO 12.
NG
©
Replace throttle position sensor. To adjust it, perform “Basic Inspection”, EC-109.
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-344, 524.
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-518.
OK or NG
OK
©
GO TO 15.
NG
©
Replace crankshaft position sensor (REF).
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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.
SEF964XA
OK or NG
OK
©
GO TO 16.
NG
©
Replace fuel injector.
16
CHECK THROTTLE POSTION SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect joint connector-18
3. Check the following
I
Continuity between joint connector terminal 2 and ground
I
Joint connector
(Refer to EL-525, “HARNESS LAYOUT”.)
Continuity should exist.
I
Also check harness for short to power.
I
Then reconnect joint connector-18.
OK or NG
OK
©
GO TO 17.
NG
©
Repair open circuit or short to power in harness or connectors.
17
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-186
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