Infiniti M45 (Y34). Manual — part 85
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-225
D
E
F
G
H
I
J
K
L
M
A
B
AT
Operation Check
●
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 4 and ground.
SCIA3094E
AT-226
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
PFP:31940
Description
ACS004AD
●
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.
●
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference Value
ACS004PQ
On Board Diagnosis Logic
ACS004AE
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “LC/B SOLENOID FNCT” with CONSULT-II or P1774 without CONSULT-II is
detected under the following conditions.
–
When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 2 is irregular during depressing accelerator pedal. (Other than during shift change)
–
When TCM detects that relation between gear position and condition of ATF pressure switch 2 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible Cause
ACS004AF
●
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
ACS004AG
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.
Start engine.
2.
Accelerate vehicle to maintain the following condition.
Selector lever: “M” position
Gear position: “M1-1st” or “M2-2nd” gear (LC/B ON/OFF)
3.
Perform step “2” again.
4.
Turn ignition switch OFF, then perform step “1” to “3” again.
5.
Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1774) is detected, refer to
If DTC (P1772) is detected, go to
.
WITH GST
Follow the procedure “With CONSULT-II”.
Item name
Condition
Display value
ATF PRES SW 2
Low coast brake solenoid valve operates.
ON
Other conditions
OFF
SAT014K
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
AT-227
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — LC/BF
ACS004AH
TCWA0134E
AT-228
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
TCM terminals and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS004AI
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “ECU INPUT SIGNALS” or “MAIN SIGNALS” in “DATA
MONITOR” mode for “A/T” with CONSULT-II.
3.
Accelerate vehicle in the manual mode (“M1-1st” or “M2-2nd”
gear), and confirm the ON/OFF actuation of the “ATF PRES SW
2”.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
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.
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
16
W/G
SEL1 (ATF pres-
sure switch 2)
–
–
40
Y/G
DATA BIT1
–
–
Item name
Condition
Display value
ATF PRES SW 2
Low coast brake solenoid
valve operates.
ON
Other conditions
OFF
PCIA0067E
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
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