Infiniti Q45 (FY33). Manual — part 40
A/T Communication Line
DESCRIPTION
The 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 VALUE
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
47*
R/L
LAN
—
—
*: This terminal is connected to the ECM.
ON BOARD DIAGNOSIS LOGIC
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.
Harness or connector
: 12th judgement flicker
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR A/T COMM LINE
AT-157
SAT014K
SAT971J
SAT682I
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode for “A/T” with CON-
SULT-II.
3) Wait at least 6 seconds or start engine and wait for at
least 6 seconds.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Turn ignition switch “ON”.
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-49.
TROUBLE DIAGNOSIS FOR A/T COMM LINE
A/T Communication Line (Cont’d)
AT-158
SAT060JA
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK CIRCUIT BETWEEN TCM AND
ECM.
1. Turn ignition switch to “OFF” position.
2. Check continuity between TCM terminal
q
47
and ECM terminal
q
99
.
Continuity should exist.
OK
E
NG
Repair or replace harness
and connector between
TCM and ECM.
Perform self-diagnosis for engine control.
Refer to EC section [“Malfunction Indicator
Lamp (MIL)”, “ON BOARD DIAGNOSTIC
SYSTEM DESCRIPTION”].
OK
E
NG
Check ECM. Refer to EC
section “TROUBLE DIAG-
NOSIS FOR DTC P0600,
P1605”.
Perform DIAGNOSTIC TROUBLE CODE
(DTC) CONFIRMATION PROCEDURE,
AT-158.
OK
E
NG
If NG, recheck TCM pin
terminals for damage or
loose connection with har-
ness connector.
INSPECTION END
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR A/T COMM LINE
A/T Communication Line (Cont’d)
H
H
H
H
AT-159
SEC220B
TCM (Transmission Control Module)
DESCRIPTION
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
Diagnostic trouble code
Malfunction is detected when ...
Check item
(Possible cause)
:
CONTROL UNIT (RAM)
TCM memory (RAM) or (ROM) is mal-
functioning.
TCM
CONTROL UNIT (ROM)
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
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.
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.
CONTROL UNIT (RAM), CONTROL UNIT (ROM)
AT-160
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