2001 INFINITI QX4 check engine

SAT341H
DescriptionNBAT0068The overrun clutch solenoid valve is activated by the TCM in
response to signals sent from the inhibitor switch, overdrive con-
trol switch, vehicle speed and throttle position sensors. The over-
run clutch operation will then be controlled.
TCM TERMINALS AND REFERENCE VALUENBAT0068S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
20 L/BOverrun clutch
solenoid valve
When overrun clutch solenoid valve operates.Battery volt-
age
When overrun clutch solenoid valve does not
operate.0V
ON BOARD DIAGNOSIS LOGICNBAT0068S03
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: O/R CLTCH SOL/CIRCTCM detects an improper voltage drop
when it tries to operate the solenoid
valve.IHarness or connectors
(The solenoid circuit is open or shorted.)
IOverrun clutch solenoid valve
: P1760
SAT014K
SAT020K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0068S01CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
Always drive vehicle on a level road to improve accuracy of
test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªENGINEº with CONSULT-II.
2) Start engine.
3) Accelerate vehicle to a speed of more than 10 km/h (6MPH)
in ªDº position (OD ªONº).
4) Release accelerator pedal completely in ªDº position (OD
ªOFFº).
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DTC P1760 OVERRUN CLUTCH SOLENOID VALVE
Description
AT-185

ON BOARD DIAGNOSIS LOGICNBAT0172S04
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: BATT/FLUID TEMP SEN
TCM receives an excessively low or high
voltage from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
IA/T fluid temperature sensor
: 8th judgement flicker
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0172S01After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Start engine.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher than 20
km/h (12 MPH).
SAT674I
No Tools
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº position, vehicle speed higher than 20
km/h (12 MPH).
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Description (Cont'd)
AT-191

Diagnostic ProcedureNBAT0173
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 6.
2 CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out the value of ªFLUID TEMP SEº.
Voltage:
Cold [20ÉC (68ÉF)]®Hot [80ÉC (176ÉF)]:
Approximately 1.5V®0.5V
SAT614J
OK or NG
OK©GO TO 4.
NG©GO TO 3.
3 DETECT MALFUNCTIONING ITEM
Check the following items:
IHarness for short to ground or short to power or open between TCM, ECM and terminal cord assembly (Main harness)
IGround circuit for ECM.
Refer to EC-174, ªWiring Diagramº.
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure
AT-193

4 CHECK A/T FLUID TEMPERATURE SENSOR WITH TERMINAL CORD ASSEMBLY
1. Turn ignition switch to ªOFFº position.
2. Disconnect terminal cord assembly connector on the right side of transfer assmebly.
3. Check resistance between terminals 8 and 9 when A/T is cold [20ÉC (68ÉF)].
SAT697I
Is resistance approx. 2.5 kW?
Ye s©GO TO 7.
No©GO TO 5.
5 DETECT MALFUNCTIONING ITEM
1. Remove oil pan.
2. Check the following items:
IA/T fluid temperature sensor
Refer to ªComponent Inspectionº, AT-110.
IHarness of terminal cord assembly for short or open
OK or NG
OK©GO TO 7.
NG©Repair or replace damaged parts.
6 CHECK INPUT SIGNAL OF A/T FLUID TEMPERATURE SENSOR (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 47 and ground while warming up A/T.
Voltage:
Cold [20ÉC (68ÉF)]®Hot [80ÉC (176ÉF)]:
Approximately 1.5V®0.5V
SAT518J
OK or NG
OK©GO TO 4.
NG©GO TO 3.
DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-194

7 CHECK TCM POWER SOURCE STEP 1
1. Turn ignition switch to ON position.
(Do not start engine.)
2. Check voltage between TCM terminals 10, 19, 28 and ground.
SAT611J
OK or NG
OK©GO TO 8.
NG©GO TO 9.
8 CHECK TCM POWER SOURCE STEP 2
1. Turn ignition switch to OFF position.
2. Check voltage between TCM terminal 28 and ground.
SAT612JC
OK or NG
OK©GO TO 10.
NG©GO TO 9.
9 DETECT MALFUNCTIONING ITEM
Check the following items:
IHarness for short or open between ignition switch and TCM terminals 10, 19 and 28 (Main harness)
IIgnition switch and 10A or 7.5A fuse [No. 18 or 24, located in the fuse block (J/B)]
Refer to EL-9, ªSchematicº.
OK or NG
OK©GO TO 10.
NG©Repair or replace damaged parts.
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DTC BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-195

DescriptionNBAT0071The vehicle speed sensor´MTR is built into the speedometer
assembly. The sensor functions as an auxiliary device to the revo-
lution sensor when it is malfunctioning. The TCM will then use a
signal sent from the vehicle speed sensor´MTR.
TCM TERMINALS AND REFERENCE VALUENBAT0071S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
40 W/LVehicle speed
sensor
When moving vehicle at 2 to 3 km/h (1 to 2
MPH) for1m(3ft)ormore.Voltage varies
between less
than 1V and
more than
4.5V
ON BOARD DIAGNOSIS LOGICNBAT0071S03
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: VHCL SPEED SEN´MTR
TCM does not receive the proper voltage
signal from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
IVehicle speed sensor
: 2nd judgement flicker
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0071S01CAUTION:
IAlways drive vehicle at a safe speed.
IIf conducting this ªDTC CONFIRMATION PROCEDUREº
again, always turn ignition switch ªOFFº and wait at least
5 seconds before continuing.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for ªA/Tº with CONSULT-II.
2) Start engine and accelerate vehicle from 0 to 25 km/h (0 to 6
MPH).
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DTC VEHICLE SPEED SENSOR´MTR
Description
AT-197

Diagnostic ProcedureNBAT0072
1 CHECK INPUT SIGNAL.
With CONSULT-II
1. Start engine.
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3. Read out the value of ªVHCL/S SE´MTRº while driving.
Check the value changes according to driving speed.
SAT614J
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 40 and ground while driving at 2 to 3 km/h (1 to 2 MPH) for1m(3ft)ormore.
SAT528J
Does battery voltage vary between less than 1V and more than 4.5V?
Ye s©GO TO 3.
No©GO TO 2.
2 DETECT MALFUNCTIONING ITEM
Check the following items:
IVehicle speed sensor and ground circuit for vehicle speed sensor
Refer to EL-94, ªComponent Parts and Harness Connector Locationº.
IHarness for short or open between TCM and vehicle speed sensor (Main harness)
OK or NG
OK©GO TO 3.
NG©Repair or replace damaged parts.
3 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-197.
OK or NG
OK©INSPECTION END
NG©GO TO 4.
DTC VEHICLE SPEED SENSOR´MTR
Diagnostic Procedure
AT-200

SAT136K
DescriptionNBAT0224The turbine revolution sensor detects input shaft rpm (revolutions
per minute). It is located on the input side of the automatic trans-
mission. The vehicle speed sensor A/T (Revolution sensor) is
located on the output side of the automatic transmission. With the
two sensors, input and output shaft rpms are accurately detected.
The result is optimal shift timing during deceleration and improved
shifting.
TCM TERMINALS AND REFERENCE VALUENBAT0224S01Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
38 WTurbine revolution
sensor
(Measure in AC
range)
When engine is running at 1,000 rpm1.2V
Voltage rises
gradually in
response to
engine speed.
42 BThrottle position
sensor (Ground)
Ð0V
ON BOARD DIAGNOSIS LOGICNBAT0224S02
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: TURBINE REV
TCM does not receive the proper voltage
signal from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
ITurbine revolution sensor
: 10th judgement flicker
DTC TURBINE REVOLUTION SENSOR
Description
AT-202