Infiniti M45 (Y34). Manual — part 73
DTC P1731 A/T 1ST ENGINE BRAKING
AT-177
D
E
F
G
H
I
J
K
L
M
A
B
AT
2.
CHECK HARNESS BETWEEN TCM AND A/T UNIT ASSEMBLY HARNESS CONNECTOR
1.
Turn ignition switch OFF.
2.
Disconnect TCM connector.
3.
Check continuity between A/T unit assembly harness connector
and TCM connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
2.
Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3.
Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> Replace the control valve assembly. Refer to
.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
Item
Connector No.
Terminal No.
(Wire color)
Continuity
TCM
F103
16 (W/G)
Yes
A/T unit assembly harness
connector
F26
5 (W/G)
TCM
F104
40 (Y/G)
Yes
A/T unit assembly harness
connector
F26
2 (Y/G)
TCM
F103
13 (W/L)
Yes
A/T unit assembly harness
connector
F27
2 (W/L)
SCIA3095E
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F26
2 (R)
Yes
Control valve assem-
bly harness connector
F302
10 (R)
A/T unit assembly
harness connector
F26
5 (L)
Yes
Control valve assem-
bly harness connector
F302
13 (L)
A/T unit assembly
harness connector
F27
2 (B/R)
Yes
Control valve assem-
bly harness connector
F301
4 (B/R)
SCIA3107E
AT-178
DTC P1731 A/T 1ST ENGINE BRAKING
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-174, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 5.
5.
CHECK TCM
1.
Check TCM input/output signal. Refer to
AT-86, "TCM Input/Output Signal Reference Values"
.
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.
DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-179
D
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A
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AT
DTC P1752 INPUT CLUTCH SOLENOID VALVE
PFP:31940
Description
ACS0048Q
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference Value
ACS004PH
On Board Diagnosis Logic
ACS0048R
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “I/C SOLENOID/CIRC” with CONSULT-II or P1752 without CONSULT-II is
detected under the following conditions.
–
When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–
When TCM detects as irregular by comparing target value with monitor value.
Possible Cause
ACS0048S
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Input clutch solenoid valve
DTC Confirmation Procedure
ACS0048T
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 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 ON. (Do not start engine.)
2.
Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Start engine.
4.
Maintain the following conditions for at least 5 consecutive sec-
onds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
Þ
4th Gear (I/C ON/OFF)
5.
If DTC is detected go to “
AT-181, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “With CONSULT-II”.
Item name
Condition
Display value (Approx.)
I/C SOLENOID
Input clutch solenoid valve operates.
0.6 - 0.8 A
Other conditions
0 - 0.05 A
SAT014K
AT-180
DTC P1752 INPUT CLUTCH SOLENOID VALVE
Wiring Diagram — AT — I/C
ACS0048U
TCWA0125E
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