Infiniti G35 (V35). Manual - part 42

DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION

AT-159

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Diagnostic Procedure

NCS000GR

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start the 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-172, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> Replace control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Temper-

ature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform 

AT-158, "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 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

ATF PRES SW 2

Low coast brake engaged. Refer to 

AT-19

 

.

ON

Low coast brake disengaged. Refer to 

AT-19

 

.

OFF

SCIA4794E

AT-160

DTC P1815 MANUAL MODE SWITCH

DTC P1815 MANUAL MODE SWITCH

PFP:34901

Description

NCS000GS

Manual mode switch is installed in A/T control device. It sends manual mode switch, shift-up and shift-down
switch signals to TCM.
TCM sends the switch signals to combination meter. By CAN communication line. Then manual mode switch
position is indicated on the A/T position indicator. For inspection, refer to 

AT-178, "A/T INDICATOR CIRCUIT"

 .

CONSULT-II Reference Value

NCS000GT

On Board Diagnosis Logic

NCS000GU

●

This is not an OBD-II self-diagnostic item. 

●

Diagnostic trouble code “P1815 MANU MODE SW/CIRC” with CONSULT-II is detected when TCM moni-
tors Manual mode, Non manual mode, Up or Down switch signal, and detects as irregular when impossi-
ble input pattern occurs 1 second or more.

Possible Cause

NCS000GV

●

Harness or connectors.
(These switches circuit is open or shorted.)

●

Manual mode select switch. (Into control device.)

●

Manual mode position select switch. (Into control device.)

DTC Confirmation Procedure

NCS000GW

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.

2.

Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.

3.

Start engine.

4.

Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
MANU MODE SW: ON

5.

If DTC is detected, go to 

AT-162, "Diagnostic Procedure"

 .

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

Selector lever: + side

ON

Other than the above

OFF

DOWN SW LEVER

Selector lever: - side

ON

Other than the above

OFF

BCIA0031E

DTC P1815 MANUAL MODE SWITCH

AT-161

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Wiring Diagram — AT — MMSW

NCS000GX

TCWM0467E

AT-162

DTC P1815 MANUAL MODE SWITCH

TCM terminals and data are reference value. Measured between each terminal and ground.

Diagnostic Procedure

NCS000GY

1. 

CHECK CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

AT-86, "SELF-DIAGNOSTIC RESULT MODE"

 .

Is a malfunction in the CAN communication indicated in the results?

YES

>> Check CAN communication line. Refer to 

AT-98, "DTC U1000 CAN COMMUNICATION LINE"

 .

NO

>> GO TO 2.

2. 

CHECK MANUAL MODE SWITCH CIRCUIT

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.

3.

Read out ON/OFF switching action of “MANU MODE SW”,
“NON M-MODE SW”, “UP SW LEVER”, “DOWN SW LEVER”.

 Without CONSULT-II

Drive vehicle in the manual mode, and confirm that the actual gear position and the meter's indication of the
position mutually coincide when the selector lever is shifted to the “+ (up)” or “- (down)” side (1st 

⇔

 5th gear).

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Manual mode switch. Refer to 

AT-163, "Component Inspection"

 .

●

Pin terminals for damage or loose connection with harness connector.

●

Open circuit or short to ground or short to power in harness or connector for A/T device (manual mode
switch).

●

Combination meter. Refer to 

DI-4, "COMBINATION METERS"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

Terminal

Wire 

color

Item

Condition

Data (Approx.)

3

L

CAN-H

–

–

8

P

CAN-L

–

–

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

Selector lever: +side

ON

Other than the above

OFF

DOWN SW LEVER

Selector lever: -side

ON

Other than the above

OFF

SCIA4988E