Infiniti QX4 (R50). Manual — part 65
SAT136K
21. TCM Self-diagnosis Does Not Activate (PNP,
Overdrive Control and Throttle Position
Switches Circuit Checks)
NBAT0204
SAT143K
SAT142K
SYMPTOM:
O/D OFF indicator lamp does not come on in TCM self-diag-
nostic procedure even the lamp circuit is good.
DESCRIPTION
NBAT0204S01
I
PNP switch
The PNP switch assemble includes a transmission range
switch. The transmission range switch detects the selector
position and sends a signal to the TCM.
I
Overdrive control switch
Detects the overdrive control switch position (ON or OFF) and
sends a signal to the TCM.
I
Throttle position switch
Consists of a wide open throttle position switch and a closed
throttle position switch.
The wide open throttle position switch sends a signal to the
TCM when the throttle valve is open at least 1/2 of the full
throttle position. The closed throttle position switch sends a
signal to the TCM when the throttle valve is fully closed.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks)
AT-257
DIAGNOSTIC PROCEDURE
=NBAT0204S03
NOTE:
The diagnostic procedure includes inspections for the overdrive
control and throttle position switch circuits.
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes (With CONSULT-II)
©
GO TO 2.
No (Without CONSULT-
II)
©
GO TO 3.
2
CHECK PNP SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “P”, “R”, “N”, “D”, “2” and “1” position switches moving selector lever to each position. Check the signal of the
selector lever position is indicated properly.
SAT643J
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont’d)
AT-258
3
CHECK PNP SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between TCM terminals 26, 27, 34, 35, 36 and ground while moving selector lever through each posi-
tion.
MTBL0205
SAT517J
Does battery voltage exist (B) or non-existent (0)?
Yes
©
GO TO 5.
No
©
GO TO 4.
4
DETECT MALFUNCTIONING ITEM
Check the following items:
I
PNP switch
Refer to “Component Inspection”, AT-263.
I
Harness for short or open between ignition switch and PNP switch (Main harness)
I
Harness for short or open between PNP switch and TCM (Main harness)
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont’d)
AT-259
5
CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Select “TCM INPUT SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Read out “OVERDRIVE SWITCH”. Check the signal of the overdrive control switch is indicated properly.
(Overdrive control switch “ON” displayed on CONSULT-II means overdrive “OFF”.)
SAT645J
Without CONSULT-II
1. Turn ignition switch to “ON” position.
(Do not start engine.)
2. Check voltage between TCM terminal 22 and ground when overdrive control switch is “ON” and “OFF”.
Voltage:
Switch position “ON”:
Battery voltage
Switch position “OFF”:
1V or less
SAT531J
OK or NG
OK (With CONSULT-II)
©
GO TO 7.
OK (Without CONSULT-
II)
©
GO TO 9.
NG
©
GO TO 6.
6
DETECT MALFUNCTIONING ITEM
Check the following items:
I
Overdrive control switch
Refer to “Component Inspection”, AT-263.
I
Harness for short or open between TCM and overdrive control switch (Main harness)
I
Harness for short or open of ground circuit for overdrive control switch (Main harness)
OK or NG
OK (With CONSULT-II)
©
GO TO 7.
OK (Without CONSULT-
II)
©
GO TO 9.
NG
©
Repair or replace damaged parts.
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont’d)
AT-260
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