ignition INFINITI QX4 2001 Factory Workshop Manual

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

10 CHECK TCM GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between TCM terminals 25, 48 and ground. Refer to wiring diagram Ð AT Ð MAIN.
Continuity should exist.
If OK, check harness for short to ground and short to power.
OK or NG
OK©GO TO 11.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
11 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-106.
OK or NG
OK©INSPECTION END
NG©GO TO 12.
12 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 InspectionNBAT0174A/T FLUID TEMPERATURE SENSORNBAT0174S01IFor 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 BATT/FLUID TEMP SEN (A/T FLUID TEMP SENSOR CIRCUIT AND TCM
POWER SOURCE)
Diagnostic Procedure (Cont'd)
AT-196

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

SAT014K
SAT971J
SAT635I
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0224S03CAUTION:
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) Start engine.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Drive vehicle under the following conditions:
Selector lever in ªDº, vehicle speed higher than 40 km/h (25
MPH), engine speed higher than 1,500 rpm, throttle opening
greater than 1.0/8 of the full throttle position and driving for
more than 5 seconds.
No Tools
1) Start engine.
2) Drive vehicle under the following conditions:
Selector lever in ªDº, vehicle speed higher than 40 km/h (25
MPH), engine speed higher than 1,500 rpm, throttle opening
greater than 1/8 of the full throttle position and driving for more
than 5 seconds.
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
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DTC TURBINE REVOLUTION SENSOR
Description (Cont'd)
AT-203

DescriptionNBAT0228The ECM and TCM provide mutual communication in relation to
engine output control signal (ignition timing retard signal) during
rapid standing starts/acceleration. With this consistent real-time
control, the shifting feel is substantially improved.
TCM TERMINALS AND REFERENCE VALUENBAT0228S01Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement
standard
(Approx.)
33 G/R LAN
ÐÐ
*: This terminal is connected to the ECM.
ON BOARD DIAGNOSIS LOGICNBAT0228S02
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: A/T COMM LINE
The ECM-A/T communication line is
open or shorted.IHarness or connector
: 12th judgement flicker
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DTC A/T COMMUNICATION LINE
Description
AT-207

SAT014K
SAT971J
SAT682I
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0228S03After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode for ªA/Tº with CONSULT-II.
3) Wait at least 6 seconds or start engine and wait for at least 6
seconds.
No Tools
1) Turn ignition switch ªONº.
2) Wait at least 6 seconds or start engine and wait for at least 6
seconds.
3) Perform self-diagnosis.
Refer to TCM SELF-DIAGNOSTIC PROCEDURE (No Tools),
AT-46.
DTC A/T COMMUNICATION LINE
Description (Cont'd)
AT-208

Diagnostic ProcedureNBAT0230
1 CHECK CIRCUIT BETWEEN TCM AND ECM
1. Turn ignition switch to OFF position.
2. Check continuity between TCM terminal 33 and ECM terminal 114.
SAT640JA
OK or NG
OK©GO TO 2.
NG©Repair or replace harness and connector between TCM and ECM.
2 CHECK DTC WITH ECM STEP 1
Perform self-diagnosis for engine control. Refer to EC-74, ªDESCRIPTIONº.
OK or NG
OK©GO TO 4.
NG©GO TO 3.
3 CHECK DTC WITH ECM STEP 2
Check ECM. Refer to EC-440 and EC-603, ªSystem Descriptionº and ªComponent Descriptionº.
OK or NG
OK©GO TO 4.
NG©Repair or replace damaged parts.
4 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-208.
OK or NG
OK©INSPECTION END
NG©GO TO 5.
5 CHECK TCM INSPECTION
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.
DTC A/T COMMUNICATION LINE
Diagnostic Procedure
AT-210

SAT574J
DescriptionNBAT0207The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGICNBAT0207S01
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: CONTROL UNIT (RAM)
: CONTROL UNIT (ROM)TCM memory (RAM) or (ROM) is mal-
functioning.TCM
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0207S02NOTE:
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.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for A/T with CONSULT-II.
2) Start engine.
3) Run engine for at least 2 seconds at idle speed.
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DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Description
AT-211

Diagnostic Procedure=NBAT0208
1 CHECK DTC
With CONSULT-II
1. Turn ignition switch ªONº and select ªSELF DIAG RESULTSº mode for A/T with CONSULT-II.
2. Touch ªERASEº.
PERFORM DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
See previous page.
Is the ªCONTROL UNIT (RAM) or CONTROL UNIT (ROM)º displayed again?
Ye s©Replace TCM.
No©INSPECTION END
DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Diagnostic Procedure
AT-212

SAT574J
DescriptionNBAT0215The TCM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the A/T.
ON BOARD DIAGNOSIS LOGICNBAT0215S01
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: CONT UNIT (EEP ROM)TCM memory (EEP ROM) is malfunc-
tioning.TCM
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0215S02NOTE:
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.
With CONSULT-II
1) Turn ignition switch ªONº and select ªDATA MONITORº mode
for A/T with CONSULT-II.
2) Start engine.
3) Run engine for at least 2 seconds at idle speed.
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DTC CONTROL UNIT (EEP ROM)
Description
AT-213