Infiniti Q45. Manual — part 61
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-157
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DTC P1772 LOW COAST BRAKE SOLENOID VALVE
PFP:31940
Description
NCS000YW
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.
CONSULT-II Reference Value
NCS000YX
On Board Diagnosis Logic
NCS000YY
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1772 LC/B SOLENOID/CIRC” with CONSULT-II or 7th judgement flicker with-
out CONSULT-II is detected when TCM detects an improper voltage drop when it tries to operate the sole-
noid valve.
Possible Cause
NCS000YZ
●
Harness or connectors
(Solenoid circuit is open or shorted.)
●
Low coast brake solenoid valve
DTC Confirmation Procedure
NCS000Z0
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing 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 “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “MANU MODE
SW” and “GEAR”.
3.
Touch “START”.
4.
Start engine.
5.
Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
MANU MODE SW: ON
GEAR: “1” or “2” (LC/B ON/OFF)
6.
AT-158, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
BCIA0031E
AT-158
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
Diagnostic Procedure
NCS000Z1
1.
CHECK INPUT SIGNAL
With CONSULT-II
1.
Turn ignition switch ON. (Do not start engine.)
2.
Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.
3.
Start engine.
4.
Read out the value of “ON OFF SOL” while driving.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-173, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-225, "Control Valve with TCM and A/T Fluid Tem-
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-157, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
SCIA4794E
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
AT-159
D
E
F
G
H
I
J
K
L
M
A
B
AT
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
PFP:31940
Description
NCS000Z2
●
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
NCS000Z3
On Board Diagnosis Logic
NCS000Z4
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-II or 7th judgement flicker with-
out 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
NCS000Z5
●
Harness or connectors
(Solenoid and switch circuits are open or shorted.)
●
Low coast brake solenoid valve
●
ATF pressure switch 2
DTC Confirmation Procedure
NCS000Z6
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing 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 conditions.
MANU MODE SW: ON
GEAR: “1” or “2” (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, go to
.
If DTC (P1772) is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
ATF PRES SW 2
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
BCIA0031E
AT-160
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
Diagnostic Procedure
NCS000Z7
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.
Drive vehicle in the manual mode (1st or 2nd gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 2” and “ON OFF
SOL”.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
AT-173, "MAIN POWER SUPPLY AND GROUND CIR-
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following.
●
The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
AT-225, "Control Valve with TCM and A/T Fluid Tem-
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-159, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
Item name
Condition
Display value
ON OFF SOL
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
ATF PRES SW 2
Low coast brake engaged. Refer to
.
ON
Low coast brake disengaged. Refer to
.
OFF
SCIA4794E
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