INFINITI QX4 2001 Factory Service Manual

20. Vehicle Does Not Decelerate By Engine
Brake
NBAT0092SYMPTOM:
Vehicle does not decelerate by engine brake when shifting
from 2
2(12)to11.
1 CHECK SYMPTOM
Is ª6. Vehicle Does Not Creep Backward In ªRº Positionº OK?
YesorNo
Ye s©Go to ª15. Engine Speed Does Not Return To Idle (Light Braking D
4,D3)º, AT-250.
No©Go to ª6. Vehicle Does Not Creep Backward In ªRº Positionº, AT-227.
TROUBLE DIAGNOSES FOR SYMPTOMS
20. Vehicle Does Not Decelerate By Engine Brake
AT-256

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.
DESCRIPTIONNBAT0204S01IPNP 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.
IOverdrive control switch
Detects the overdrive control switch position (ON or OFF) and
sends a signal to the TCM.
IThrottle 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.
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TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks)
AT-257

DIAGNOSTIC PROCEDURE=NBAT0204S03NOTE:
The diagnostic procedure includes inspections for the overdrive
control and throttle position switch circuits.
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
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 ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out ªPº, ªRº, ªNº, ªDº, ª2º and ª1º 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 ªONº 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)?
Ye s©GO TO 5.
No©GO TO 4.
4 DETECT MALFUNCTIONING ITEM
Check the following items:
IPNP switch
Refer to ªComponent Inspectionº, AT-263.
IHarness for short or open between ignition switch and PNP switch (Main harness)
IHarness for short or open between PNP switch and TCM (Main harness)
OK or NG
OK©GO TO 5.
NG©Repair or replace damaged parts.
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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 ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out ªOVERDRIVE SWITCHº. Check the signal of the overdrive control switch is indicated properly.
(Overdrive control switch ªONº displayed on CONSULT-II means overdrive ªOFFº.)
SAT645J
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminal 22 and ground when overdrive control switch is ªONº and ªOFFº.
Voltage:
Switch position ªONº:
Battery voltage
Switch position ªOFFº:
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:
IOverdrive control switch
Refer to ªComponent Inspectionº, AT-263.
IHarness for short or open between TCM and overdrive control switch (Main harness)
IHarness 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

7 CHECK THROTTLE POSITION SWITCH CIRCUIT (With CONSULT-II)
With CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Apply vacuum to the throttle opener, then check the following. Refer to steps 1 and 2 of ªPreparationº, ªTCM SELF-
DIAGNOSTIC PROCEDURE (No Tools)º, AT-46.
4. Read out ªCLOSED THL/SWº and ªW/O THRL/P-SWº depressing and releasing accelerator pedal.
Check the signal of throttle position switch is indicated properly.
MTBL0011
SAT646J
OK or NG
OK©GO TO 10.
NG©GO TO 8.
8 DETECT MALFUNCTIONING ITEM
Check the following items:
IThrottle position switch
Refer to ªComponent Inspectionº, AT-264.
IHarness for short or open between ignition switch and throttle position switch (Main harness)
IHarness for short or open between throttle position switch and TCM (Main harness)
OK or NG
OK©GO TO 10.
NG©Repair or replace damaged parts.
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TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-261

9 CHECK THROTTLE POSITION SWITCH CIRCUIT (Without CONSULT-II)
Without CONSULT-II
1. Turn ignition switch to ªONº position.
(Do not start engine.)
2. Check voltage between TCM terminals 16, 17 and ground while depressing, and releasing accelerator pedal slowly.
(after warming up engine)
[Refer to ªPreparationº, ªTCM SELF-DIAGNOSTIC PROCEDURE (No Tools)º, AT-46.]
MTBL0519
SAT526J
OK or NG
OK©GO TO 10.
NG©GO TO 8.
10 CHECK DTC
Perform Diagnostic procedure, AT-258.
OK or NG
OK©INSPECTION END
NG©GO TO 11.
11 CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK©INSPECTION END
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-262

SAT144K
COMPONENT INSPECTIONNBAT0204S04Overdrive Control SwitchNBAT0204S0401ICheck continuity between two terminals.
Continuity:
Switch position ªONº:
No
Switch position ªOFFº:
Ye s
SAT517GB
SAT843BG
Park/Neutral Position SwitchNBAT0204S04021. Check continuity between terminals 1 and 2 and between ter-
minals 3 and 4, 5, 6, 7, 8, 9 while moving manual shaft through
each position.
Lever position Terminal No.
P 1-2 3-4
R 3-5
N 1-2 3-6
D 3-7
2 3-8
1 3-9
SAT807B
2. If NG, check again with manual control linkage disconnected
from manual shaft of A/T assembly. Refer to step 1.
3. If OK on step 2, adjust manual control linkage. Refer to AT-276.
SAT386HC
4. If NG on step 2, remove PNP switch from A/T and check con-
tinuity of PNP switch terminals. Refer to step 1.
5. If OK on step 4, adjust PNP switch. Refer to AT-276.
6. If NG on step 4, replace PNP switch.
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TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-263

SAT132K
Throttle Position SwitchNBAT0204S0403Closed Throttle Position Switch (Idle Position)
ICheck continuity between terminals 5 and 6.
[Refer to ªPreparationº, ªTCM SELF-DIAGNOSTIC PROCE-
DURE (No Tools)º, AT-46.]
Accelerator pedal condition Continuity
Released Yes
Depressed No
ITo adjust closed throttle position switch, refer to EC-431, ªSystem
Descriptionº.
SAT137K
Wide Open Throttle Position Switch
ICheck continuity between terminals 4 and 5.
Accelerator pedal condition Continuity
Released No
Depressed Yes
SAT251JA
A/T Fluid Temperature SwitchNBAT0204S04041. Make sure the A/T fluid warning lamp lights when the key is
inserted and turned to ªONº.
2. Make sure the A/T fluid warning lamp goes off when turning the
ignition switch to ªONº.
3. Check resistance between terminal 10 and ground while
changing temperature as shown at left.
Temperature ÉC (ÉF) Resistance
140 (284) or more Yes
140 (284) or less No
TROUBLE DIAGNOSES FOR SYMPTOMS
21. TCM Self-diagnosis Does Not Activate (PNP, Overdrive Control and Throttle Position Switches Circuit Checks) (Cont'd)
AT-264

DescriptionNBAT0093IThe mechanical key interlock mechanism also operates as a
shift lock:
With the key switch turned to ªONº, the selector lever cannot
be shifted from ªPº (parking) to any other position unless the
brake pedal is depressed.
With the key removed, the selector lever cannot be shifted
from ªPº to any other position.
The key cannot be removed unless the selector lever is placed
in ªPº.
IThe shift lock and key interlock mechanisms are controlled by
the ON-OFF operation of the shift lock solenoid and by the
operation of the rotator and slider located inside the key
cylinder, respectively.
SAT145K
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A/T SHIFT LOCK SYSTEM
Description
AT-265