Infiniti F50. Manual - part 85

DTC P1843 ATF PRESSURE SWITCH 3

AT-225

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Diagnostic Procedure

ECS0088S

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

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

3.

Accelerate vehicle in the “D” position (3rd 

Þ

 4th gear), and con-

firm the ON/OFF actuation of the “ATF PRES SW 3”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK HARNESS BETWEEN TCM AND A/T UNIT ASSEMBLY HARNESS CONNECTOR

1.

Turn ignition switch to “OFF” position.

2.

Disconnect TCM connector.

3.

Check continuity between A/T unit assembly harness connector
and TCM connector.

4.

If OK, check harness for short to ground and short to power.

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

PCIA0067E

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F103

4 (P/L)

Yes

A/T unit assembly harness 
connector

F26

7 (P/L)

TCM

F104

40 (Y/G)

Yes

A/T unit assembly harness 
connector

F26

2 (Y/G)

SCIA3099E

AT-226

DTC P1843 ATF PRESSURE SWITCH 3

3. 

CHECK TERMINAL CORD ASSEMBLY

1.

Remove oil pan. Refer to 

AT-289, "Control Valve Assembly"

 .

2.

Disconnect A/T unit assembly harness connector and control valve assembly harness connector.

3.

Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.

4.

If OK, check harness for short to ground and short to power.

OK or NG

OK

>> Replace the control valve assembly. Refer to 

AT-289, "Control Valve Assembly"

 .

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

4. 

CHECK DTC

Perform DTC confirmation procedure. Refer to  

AT-223, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5. 

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

2.

If NG, recheck TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> Replace the control valve assembly. Refer to 

AT-289, "Control Valve Assembly"

 .

NG

>> Repair or replace damaged parts.

Item

Connector No.

Terminal No. (Wire color)

Continuity

A/T unit assembly 
harness connector

F26

2 (R)

Yes

Control valve assem-
bly harness connec-
tor

F302

10 (R)

A/T unit assembly 
harness connector

F26

7 (W)

Yes

Control valve assem-
bly harness connec-
tor

F302

15 (W)

SCIA3100E

DTC P1845 ATF PRESSURE SWITCH 5

AT-227

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DTC P1845 ATF PRESSURE SWITCH 5

PFP:25240

Description

ECS0088T

Fail-safe function to detect direct clutch solenoid valve condition.

On Board Diagnosis Logic

ECS0088U

●

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

●

Diagnostic trouble code “ATF PRES SW 5/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 5 is
irregular during depressing accelerator pedal. (Other than during shift change)

Possible Cause

ECS0088V

●

ATF pressure switch 5

●

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

DTC Confirmation Procedure

ECS0088W

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: 1st 

Þ

 2nd Gear (D/C 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 (P1845) is detected, go to 

AT-229, "Diagnostic Proce-

dure"

 .

If DTC (P1762) is detected, go to 

AT-190, "Diagnostic Procedure"

 .

SAT014K

AT-228

DTC P1845 ATF PRESSURE SWITCH 5

Wiring Diagram — AT — FPSW5

ECS0088X

TCM terminals and data are reference value.

TCWM0030E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

22

P/B

SEL2
(pressure switch 5)

–

–

40

Y/G

DATA BIT1

–

–