Infiniti Q45. Manual - part 62

DTC P1815 MANUAL MODE SWITCH

AT-161

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DTC P1815 MANUAL MODE SWITCH

PFP:34901

Description

NCS000Z8

Manual mode switch is installed in A/T device. It sends manual mode switch, shift-up and shift-down switch
signals to the TCM.
The 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-179, "A/T INDICATOR CIRCUIT"

 .

CONSULT-II Reference Value

NCS000Z9

On Board Diagnosis Logic

NCS000ZA

●

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

NCS000ZB

●

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

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Manual mode select switch (Into control device)

●

Manual mode position select switch (Into control device)

DTC Confirmation Procedure

NCS000ZC

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 “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-163, "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

AT-162

DTC P1815 MANUAL MODE SWITCH

Wiring Diagram — AT — MMSW

NCS000ZD

TCWM0307E

DTC P1815 MANUAL MODE SWITCH

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Diagnostic Procedure

NCS000ZE

1. 

CHECK CAN COMMUNICATION LINE

Perform the self-diagnosis. Refer to 

AT-87, "SELF-DIAGNOSTIC RESULT MODE"

 .

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

YES

>> Check CAN communication line. Refer to 

AT-99, "DTC U1000 CAN COMMUNICATION LINE"

 .

NO

>> GO TO 2.

2. 

CHECK MANUAL MODE SWITCH CIRCUIT

 With CONSULT-II

1.

Turn ignition switch ON. (Do not start engine.)

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-164, "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 meters. Refer to 

DI-16, "Trouble Diagnosis"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-161, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

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

AT-164

DTC P1815 MANUAL MODE SWITCH

5. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace damaged parts.

6. 

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-

perature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

Component Inspection

NCS000ZF

MANUAL MODE SWITCH

Check continuity between terminals.

Item

Position

Connector No.

Terminal No. 

(Unit side)

Continuity

Manual mode 
select switch

Auto

M97

4 - 5

Yes

Manual

1 - 4

Manual mode 
position select 
switch

Up

3 - 4

Down

2 - 4

SCIA4626E