Infiniti M35/M45 Y50. Manual - part 61

DTC P1815 MANUAL MODE SWITCH

AT-167

D

E

F

G

H

I

J

K

L

M

A

B

AT

DTC P1815 MANUAL MODE SWITCH

PFP:34901

Description

NCS001OT

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

AT-186, "A/T INDICATOR CIRCUIT"

 .

CONSULT-II Reference Value

NCS001OU

On Board Diagnosis Logic

NCS001OV

●

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

NCS001OW

●

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

NCS001OX

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 “MAIN 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-170, "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

BCIA0030E

AT-168

DTC P1815 MANUAL MODE SWITCH

Wiring Diagram — AT — MMSW

NCS001OY

TCWT0347E

DTC P1815 MANUAL MODE SWITCH

AT-169

D

E

F

G

H

I

J

K

L

M

A

B

AT

TCWT0420E

AT-170

DTC P1815 MANUAL MODE SWITCH

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

Diagnostic Procedure

NCS001OZ

1. 

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Refer to 

AT-92, "SELF-DIAGNOSTIC RESULT MODE"

 .

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

YES

>> Check CAN communication line. Refer to 

AT-105, "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-171, "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).

●

Unified meter and A/C amp. Refer to 

DI-5, "COMBINATION METERS"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

Terminal

Item

Condition

Data (Approx.)

3

CAN-H

–

–

8

CAN-L

–

–

9

Starter relay

Selector lever in “N”, “P” positions.

Battery voltage

Selector lever in “R”, “D” positions.

0 V

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