Infiniti QX4 (R50). Manual — part 53
Wiring Diagram — AT — LAN
NBAT0229
MAT922A
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC A/T COMMUNICATION LINE
Wiring Diagram — AT — LAN
AT-209
Diagnostic Procedure
NBAT0230
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, “DESCRIPTION”.
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, “System Description” and “Component Description”.
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
Description
NBAT0207
The 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 LOGIC
NBAT0207S01
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
NBAT0207S02
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
for A/T with CONSULT-II.
2)
Start engine.
3)
Run engine for at least 2 seconds at idle speed.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Description
AT-211
Diagnostic Procedure
=NBAT0208
1
CHECK DTC
With CONSULT-II
1. Turn ignition switch “ON” and select “SELF DIAG RESULTS” mode for A/T with CONSULT-II.
2. Touch “ERASE”.
PERFORM DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
See previous page.
Is the “CONTROL UNIT (RAM) or CONTROL UNIT (ROM)” displayed again?
Yes
©
Replace TCM.
No
©
INSPECTION END
DTC CONTROL UNIT (RAM), CONTROL UNIT (ROM)
Diagnostic Procedure
AT-212
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