Infiniti G20 (P11). Manual — part 50
Diagnostic Procedure
NCAT0071
1
CHECK DTC WITH ECM
Perform diagnostic test mode II (self-diagnostic results) for engine control.
Refer to EC-81, “Malfunction Indicator Lamp (MIL)”.
OK or NG
OK (With CONSULT-II)
©
GO TO 2.
OK (Without CONSULT-
II)
©
GO TO 3.
NG
©
Check throttle position sensor circuit for engine control. Refer to EC-177, “DTC P0120
THROTTLE POSITION SENSOR”.
2
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Apply vacuum to the throttle opener then check the following. Refer from step 1 to 5 of “Preparation”, “TCM SELF-DI-
AGNOSTIC PROCEDURE (No Tools)”, AT-49.
2. Turn ignition switch to “ON” position.
(Do not start engine.)
3. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
SAT014K
4. Read out the value of “THRTL POS SEN”.
Voltage:
Fully-closed throttle:
Approximately 0.5V
Fully-open throttle:
Approximately 4V
SAT614J
OK or NG
OK
©
GO TO 4.
NG
©
Check harness for short or open between ECM and TCM regarding throttle position sen-
sor circuit. (Main harness)
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure
AT-197
3
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Apply vacuum to the throttle opener then check the following. Refer to steps 1 to 5 of “Preparation”, “TCM SELF-DIAG-
NOSTIC PROCEDURE (No Tools)”, AT-49.
2. Turn ignition switch to “ON” position.
(Do not start engine.)
3. Check voltage between TCM terminals 41 and 42 while accelerator pedal is depressed slowly.
Voltage:
Fully-closed throttle valve:
Approximately 0.5V
Fully-open throttle valve:
Approximately 4V
(Voltage rises gradually in response to throttle position)
SAT453J
OK or NG
OK
©
GO TO 5.
NG
©
Check harness for short or open between ECM and TCM regarding throttle position sen-
sor circuit. (Main harness)
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
AT-198
4
CHECK THROTTLE POSITION SWITCH CIRCUIT (WITH CONSULT-II)
With CONSULT-II
1. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 to 5 of “Preparation”, “TCM SELF-DIAG-
NOSTIC PROCEDURE (No Tools)”, AT-49.
2. Turn ignition switch to “ON” position.
(Do not start engine.)
3. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
4. Read out “CLOSED THL/SW” and “W/O THRL/P-SW” depressing and releasing accelerator pedal.
Check the signal of throttle position switch is indicated properly.
MTBL0011
SAT702J
OK or NG
OK
©
GO TO 6.
NG
©
Check the following items:
I
Throttle position switch — Refer to “Components Inspection”, AT-201.
I
Harness for short or open between ignition switch and throttle position switch (Main
harness)
I
Harness for short or open between throttle position switch and TCM (Main harness)
GI
MA
EM
LC
EC
FE
CL
MT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
AT-199
5
CHECK THROTTLE POSITION SWITCH CIRCUIT (WITHOUT CONSULT-II)
Without CONSULT-II
1. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 to 5 of “Preparation”, “TCM SELF-DIAG-
NOSTIC PROCEDURE (No Tools)”, AT-49.
2. Turn ignition switch to “ON” position.
(Do not start engine.)
3. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly.
(After warming up engine)
MTBL0137
SAT454J
OK or NG
OK
©
GO TO 6.
NG
©
Check the following items:
I
Throttle position switch — Refer to “Components Inspection”, AT-201.
I
Harness for short or open between ignition switch and throttle position switch (Main
harness)
I
Harness for short or open between throttle position switch and TCM (Main harness)
6
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-194.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
DTC P1705 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
AT-200
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