Infiniti F50. Manual - part 83

DTC P1815 MANUAL MODE SWITCH

AT-217

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Diagnostic Procedure

ECS0088E

1. 

CHECK MANUAL MODE SWITCH CIRCUIT (WITH CONSULT-II)

 With CONSULT-II

1.

Turn ignition switch to “ON” position. (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 the “MANU MODE SW”,
“NON M-MODE SW”, “UP SW LEVER”, “DOWN SW LEVER”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

2. 

CHECK MANUAL MODE SWITCH CIRCUIT (WITHOUT CONSULT-II)

 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 items.

●

Power supply. Refer to 

DI-7, "COMBINATION METERS"

 .

●

Manual mode switch. Refer to 

AT-218, "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).

OK or NG

OK

>> GO TO 4

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform DTC confirmation procedure. Refer to 

AT-215, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace the control device assembly.

PCIA0064E

AT-218

DTC P1815 MANUAL MODE SWITCH

Component Inspection

ECS0088F

MANUAL MODE SWITCH

Check continuity between terminals.

Position Indicator Lamp

ECS0088G

DIAGNOSTIC PROCEDURE

1. 

CHECK INPUT SIGNALS (WITH CONSULT-II)

 With CONSULT-II

1.

Start engine.

2.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for A/T with
CONSULT-II and read out the value of “GEAR”.

3.

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 select lever is shifted to the “+ (up)” or “-
(down)” side (1st 

⇔

 5th gear).

 OK or NG

OK

>> INSPECTION END

NG

>> Check the following items.

Position Indicator Lamp Symptom Chart

Item

Position

Connector 

No.

Terminal No.

(Unit side)

Continuity

Manual mode 
(select) switch

Auto

M97

4 - 5

Yes

Manual

1 - 4

UP switch

Up

3 - 4

DOWN switch

Down

2 - 4

SCIA1769E

PCIA0065E

Items

Presumed location of trouble

The actual gear position does not change, or shifting into the 
manual mode is not possible (no gear shifting in the manual mode 
possible).
The position indicator lamp is not indicated.

Manual mode switch 
Refer to 

AT-215, "DTC P1815 MANUAL MODE SWITCH"

 .

A/T main system (Fail-safe function actuated)

●

Refer to 

AT-87, "SELF-DIAGNOSTIC PROCEDURE (WITH 

CONSULT-II)"

 .

The actual gear position changes, but the position indicator lamp 
is not indicated.

Execute the self-diagnosis function.

●

Refer to 

AT-87, "SELF-DIAGNOSTIC PROCEDURE (WITH 

CONSULT-II)"

 .

The actual gear position and the indication on the position indica-
tor lamp do not coincide.

Execute the self-diagnosis function.

●

Refer to 

AT-87, "SELF-DIAGNOSTIC PROCEDURE (WITH 

CONSULT-II)"

 .

Only a specific position or positions is/are not indicated on the 
position indicator lamp.

Check the combination meter.
Refer to 

DI-7, "COMBINATION METERS"

 .

DTC P1841 ATF PRESSURE SWITCH 1

AT-219

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DTC P1841 ATF PRESSURE SWITCH 1

PFP:25240

Description

ECS0088H

Fail-safe function to detect front brake clutch solenoid valve condition.

On Board Diagnosis Logic

ECS0088I

●

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

●

Diagnostic trouble code “ATF PRES SW 1/CIRC” with CONSULT-II is detected, when TCM detects that
actual gear ratio is normal, and relation between gear position and condition of ATF pressure switch 1 is
irregular during depressing accelerator pedal. (Other than during shift change)

Possible Cause

ECS0088J

●

ATF pressure switch 1

●

Harness or connectors
(The switch circuit is open or shorted.)

DTC Confirmation Procedure

ECS0088K

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF”
and wait at least 10 seconds before conducting 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 condition.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position 
Gear position: 3rd 

Þ

 4th Gear   (FR/B ON/OFF) 

3.

Perform step “2” again.

4.

Turn ignition switch to “OFF” position, then perform step “1” to
“3” again.

5.

Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
If DTC (P1841) is detected, go to 

AT-221, "Diagnostic Proce-

dure"

 .

If DTC (P1757) is detected, go to 

AT-181, "Diagnostic Procedure"

 .

SAT014K

AT-220

DTC P1841 ATF PRESSURE SWITCH 1

Wiring Diagram — AT — FPSW1

ECS0088L

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

TCWM0028E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

35

B/Y

PSB2 (pressure 
switch 1)

When 

vehicle 

starts

When front brake solenoid valve “OFF”.

Battery voltage

When front brake solenoid valve“ ON”.

0V