Infiniti M45 (Y34). Manual — part 84
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-221
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — LC/B
ACS004AA
TCWA0133E
AT-222
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
TCM terminal and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS004AB
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Read out the value of “ON OFF SOL” while driving.
Without CONSULT-II
1.
Start engine.
2.
Check voltage between TCM connector and ground.
OK or NG
OK >> GO
TO
6.
NG
>> GO TO 2.
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
Item name
Condition
Display value
ON OFF SOL
Low coast brake solenoid
valve operates.
ON
Other conditions
OFF
SCIA4575E
Item
Con-
nector
No.
Terminal
No.
Condition
Data
(Approx.)
Low
coast
brake
solenoid
valve
F103
13 (W/L)
- Ground
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
SCIA4578E
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-223
D
E
F
G
H
I
J
K
L
M
A
B
AT
2.
CHECK LOW COAST BRAKE SOLENOID VALVE CIRCUIT
1.
Turn ignition switch OFF.
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
5.
NG
>> GO TO 3.
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.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK VALVE RESISTANCE
Check valve resistance
●
Refer to
AT-224, "Component Inspection"
OK or NG
OK >> GO
TO
6.
NG
>> Replace the control valve assembly. Refer to
AT-312, "Control Valve Assembly"
.
Solenoid valve
Connector No.
Terminal No.
Resistance (Approx.)
Low coast brake
solenoid valve
F27
2 - 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
AT-224
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
5.
CHECK POWER SOURCE CIRCUIT
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 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-220, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
7.
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.
Component Inspection
ACS004AC
LOW COAST BRAKE SOLENOID VALVE
Resistance Check
1.
Turn ignition switch OFF.
2.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
3.
Disconnect control valve assembly harness connector.
4.
Check resistance between terminal and ground.
5.
If NG, replace control valve assembly. Refer to
Item
Connector No.
Terminal No.
(Wire color)
Continuity
TCM
F103
13 (W/L)
Yes
A/T unit assembly harness
connector
F27
2 (W/L)
SCIA1836E
Solenoid Valve
Connector No.
Terminal No.
(Wire color)
Resistance
(Approx.)
Low coast brake sole-
noid valve
F301
4 (W) - Ground
20 - 40
Ω
SCIA3093E
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