Nissan Titan. Manual — part 604
P1772 LOW COAST BRAKE SOLENOID
TM-99
< DTC/CIRCUIT DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
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
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
TM-201, "Control Valve with TCM"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-98, "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
TM-100
< DTC/CIRCUIT DIAGNOSIS >
P1774 LOW COAST BRAKE SOLENOID
P1774 LOW COAST BRAKE SOLENOID
Description
INFOID:0000000009885852
• Low coast brake solenoid valve is turned “ON” or “OFF” by the TCM in response to signals sent from the
transmission range switch, output speed sensor and accelerator pedal position sensor (throttle position sen-
sor). 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 malfunc-
tion such as control valve sticking, improper solenoid valve operation.
CONSULT Reference Value in Data Monitor Mode
INFOID:0000000009885853
On Board Diagnosis Logic
INFOID:0000000009885854
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1774” with CONSULT or 7th judgment flicker without CONSULT 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
INFOID:0000000009885855
• Harness or connectors
(The solenoid and switch circuits are open or shorted.)
• Low coast brake solenoid valve
• ATF pressure switch 2
DTC Confirmation Procedure
INFOID:0000000009885856
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
1. Start engine.
2. Accelerate vehicle to maintain the following conditions.
Floor shift models:
SLCT LVR POSI: “1” or “2” position
GEAR: “1st” or “2nd” (LC/B ON/OFF)
Column shift models:
MANUAL MODE SW: ON
GEAR: “1st” or “2nd” (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 “TRANSMISSION” with CONSULT. If DTC (P1774) is detected,
If DTC (P1772) is detected, go to
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
P1774 LOW COAST BRAKE SOLENOID
TM-101
< DTC/CIRCUIT DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
WITH GST
Follow the procedure “With CONSULT”.
Diagnosis Procedure
INFOID:0000000009885857
1.
CHECK INPUT SIGNALS
With CONSULT
1. Start the engine.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.
3. Drive vehicle in the “1” or “2” position (“1
1
” or “2
2
” 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
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> Replace the control valve with TCM. Refer to
TM-201, "Control Valve with TCM"
NG
>> Repair or replace damaged parts.
4.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-100, "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
TM-102
< DTC/CIRCUIT DIAGNOSIS >
P1815 M-MODE SWITCH
P1815 M-MODE SWITCH
Description
INFOID:0000000009885858
When an impossible pattern of switch signals is detected, this is judged to be an irregularity.
CONSULT Reference Value in Data Monitor Mode
INFOID:0000000009885859
On Board Diagnosis Logic
INFOID:0000000009885860
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1815” with CONSULT is detected when TCM monitors Manual mode, Non manual
mode, Up or Down switch signal, and detects as irregular when impossible input pattern occurs 1 second or
more.
Possible Cause
INFOID:0000000009885861
• Harness or connectors
(The switch circuits are open or shorted.)
• Mode select switch (Into A/T shift selector)
• Position select switch (Into A/T shift selector)
DTC Confirmation Procedure
INFOID:0000000009885862
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
1. Turn ignition switch ON.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT.
3. Start engine.
4. Move selector lever to “M” position.
5. Drive vehicle and maintain the following conditions for at least 2 consecutive seconds.
MANU MODE SW: ON
6. If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000009885863
1.
CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Is a malfunction in the CAN communication indicated in the results?
Yes or No
Yes
>> Check CAN communication line. Refer to
No
>> GO TO 2.
2.
CHECK MANUAL MODE SWITCH CIRCUIT
Item name
Condition
Display Value
MANU MODE SW
Manual shift gate position (neutral)
ON
Other than the above
OFF
NON M-MODE SW
Manual shift gate position
OFF
Other than the above
ON
UP SW LEVER
Select lever: + side
ON
Other than the above
OFF
DOWN SW LEVER
Select lever: - side
ON
Other than the above
OFF
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