Infiniti F50. Manual — part 80
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
AT-205
D
E
F
G
H
I
J
K
L
M
A
B
AT
4.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-289, "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.
5.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-202, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
6.
PERFORM 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.
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F26
4 (Y)
Yes
Control valve assem-
bly harness connec-
tor
F302
11 (Y)
A/T unit assembly
harness connector
F27
3 (B/W)
Yes
Control valve assem-
bly harness connec-
tor
F301
5 (B/W)
SCIA3091E
AT-206
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
PFP:31940
Description
ECS0087W
Low coast brake solenoid valve is turned “ON” or “OFF” 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.
On Board Diagnosis Logic
ECS0087X
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “LC/B SOLENOID/CIRC” with CONSULT-II or P1772 without CONSULT-II is
detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.
Possible Cause
ECS0087Y
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Low coast brake solenoid valve
DTC Confirmation Procedure
ECS0087Z
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 to “ON” position. (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.
Selector lever: “M” position
Gear position: “M1-1st” or “M2-2nd” gear (LC/B ON/OFF)
5.
If DTC is detected, go to
AT-208, "Diagnostic Procedure"
WITH GST
Follow the procedure “With CONSULT-II”.
SAT014K
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-207
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — LC/B
ECS00880
TCM terminal and data are reference value. Measured between each terminal and ground.
TCWM0025E
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
13
W/L
Low coast brake
solenoid valve
When
vehicle
cruises
When the solenoid valve is operating (when running in
M1-1 gear or M2-2 gear)
Battery voltage
When the solenoid valve is not operating (when running in
“D”)
0V
AT-208
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
Diagnostic Procedure
ECS00881
1.
CHECK LOW COAST BRAKE SOLENOID VALVE CIRCUIT
1.
Turn ignition switch to “OFF” position.
2.
Disconnect A/T unit assembly harness connector at the trans-
mission right side.
3.
Check the resistance between terminal and ground.
OK or NG
OK >> GO
TO
4.
NG
>> GO TO 2.
2.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-289, "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.
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 VALVE RESISTANCE
Check valve resistance
●
Refer to
AT-210, "Component Inspection"
OK or NG
OK >> GO
TO
4.
NG
>> Replace the control valve assembly. Refer to
AT-289, "Control Valve Assembly"
Solenoid valve
Connector No.
Terminal No.
(Wire color)
Resistance (Approx.)
Low coast brake
solenoid valve
F27
2 (W/L) - Ground
20 - 40
Ω
SCIA1835E
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F27
2 (B/R)
Yes
Control valve assem-
bly harness connec-
tor
F301
4 (B/R)
SCIA3092E
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