INFINITI QX4 2001 Factory Service Manual

SAT014K
SAT020K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0031S01CAUTION:
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.
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 and maintain the following conditions for at least
10 minutes (Total). (It is not necessary to maintain continu-
ously.)
CMPS´RPM (REF): 450 rpm or more
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD ªONº)
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Description (Cont'd)
AT-106

Wiring Diagram Ð AT Ð FTSNBAT0187
MAT909A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Wiring Diagram Ð AT Ð FTS
AT-107

Diagnostic ProcedureNBAT0032
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 item:
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-142, ªWiring Diagramº.
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Diagnostic Procedure
AT-108

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.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Diagnostic Procedure (Cont'd)
AT-109

7 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-106.
OK or NG
OK©INSPECTION END
NG©GO TO 8.
8 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.
SAT687I
Component InspectionNBAT0033A/T FLUID TEMPERATURE SENSORNBAT0033S01IFor removal, refer to AT-273.
ICheck resistance between terminals 8 and 9 while changing
temperature as shown at left.
Temperature ÉC (ÉF) Resistance
20 (68) Approximately 2.5 kW
80 (176) Approximately 0.3 kW
DTC P0710 A/T FLUID TEMPERATURE SENSOR CIRCUIT
Diagnostic Procedure (Cont'd)
AT-110

SAT136K
DescriptionNBAT0034The revolution sensor detects the revolution of the out put shaft
parking pawl lock gear and emits a pulse signal. The pulse signal
is sent to the TCM which converts it into vehicle speed.
TCM TERMINALS AND REFERENCE VALUENBAT0034S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
29 WRevolution sensor
(Measure in AC
range)
When vehicle cruises at 30 km/h (19 MPH).1V or more
Voltage rises
gradually in
response to
vehicle speed.
When vehicle parks. 0V
42 BThrottle position
sensor
(Ground)
Ð0V
ON BOARD DIAGNOSIS LOGICNBAT0034S03
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: VEH SPD SEN/CIR AT
TCM does not receive the proper voltage
signal from the sensor.IHarness or connectors
(The sensor circuit is open or shorted.)
IRevolution sensor
: P0720
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0720 VEHICLE SPEED SENSOR´A/T (REVOLUTION SENSOR)
Description
AT - 111

SAT014K
SAT971J
SAT014K
SAT020K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0034S01CAUTION:
IAlways drive vehicle at a safe speed.
IBe careful not to rev engine into the red zone on the
tachometer.
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.
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) Drive vehicle and check for an increase of ªVHCL/S SE´MTRº
value.
If the check result is NG, go to ªDIAGNOSTIC PROCEDUREº,
AT-200.
If the check result is OK, go to following step.
3) Select ªDATA MONITORº mode for ªENGINEº with CONSULT-
II.
4) Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD ªONº)
Driving pattern: Driving the vehicle uphill (increased engine
load) will help maintain the driving conditions required for this
test.
If the check result is NG, go to ªDIAGNOSTIC PROCEDUREº,
AT-114.
If the check result is OK, go to following step.
5) Maintain the following conditions for at least 5 consecutive
seconds.
CMPS´RPM (REF): 3,500 rpm or more
THRTL POS SEN: More than 1.2V
Selector lever: D position (OD ªONº)
Driving pattern: Driving the vehicle uphill (increased engine
load) will help maintain the driving conditions required for this
test.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0720 VEHICLE SPEED SENSOR´A/T (REVOLUTION SENSOR)
Description (Cont'd)
AT-112

Wiring Diagram Ð AT Ð VSSA/TNBAT0188
MAT910A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0720 VEHICLE SPEED SENSOR´A/T (REVOLUTION SENSOR)
Wiring Diagram Ð AT Ð VSSA/T
AT-113

Diagnostic ProcedureNBAT0035
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Yes (With CONSULT-II)©GO TO 2.
No (Without CONSULT-
II)©GO TO 5.
2 CHECK INPUT SIGNAL (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 ªVHCL/S SE´A/Tº while driving.
Check the value changes according to driving speed.
SAT614J
OK or NG
OK©GO TO 3.
NG©GO TO 4.
3 CHECK REVOLUTION SENSOR
Refer to ªComponent Inspectionº, AT-115.
OK or NG
OK©GO TO 6.
NG©Repair or replace revolution sensor.
4 DETECT MALFUNCTIONING ITEM
Check the following items:
IHarness for short or open between TCM and revolution sensor (Main harness)
IHarness for short or open between revolution sensor and ECM (Main harness)
IGround circuit for ECM
Refer to EC-142, ªWIRING DIAGRAMº.
OK or NG
OK©GO TO 6.
NG©GO TO 3.
DTC P0720 VEHICLE SPEED SENSOR´A/T (REVOLUTION SENSOR)
Diagnostic Procedure
AT-114

5 CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 29 and ground while driving.
(Measure with AC range.)
Voltage:
At 0 km/h (0 MPH):
0V
At 30 km/h (19 MPH):
1V or more
(Voltage rises gradually in response to vehicle speed.)
SAT519J
OK or NG
OK©GO TO 3.
NG©GO TO 4.
6 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-112.
OK or NG
OK©INSPECTION END
NG©GO TO 7.
7 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.
SAT210IA
Component InspectionNBAT0036REVOLUTION SENSORNBAT0036S01IFor removal, refer to AT-273.
ICheck resistance between terminals 1, 2 and 3.
Terminal No. Resistance
1 2 500 - 650W
2 3 No continuity
1 3 No continuity
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0720 VEHICLE SPEED SENSOR´A/T (REVOLUTION SENSOR)
Diagnostic Procedure (Cont'd)
AT-115