Infiniti F50. Manual - part 84

 

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Infiniti F50. Manual - part 84

 

 

DTC P1841 ATF PRESSURE SWITCH 1

AT-221

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Diagnostic Procedure

ECS0088M

1. 

CHECK INPUT SIGNALS (WITH CONSULT-II)

 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 1”.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

2. 

CHECK INPUT SIGNALS (WITHOUT CONSULT-II)

 Without CONSULT-II

1.

Start engine.

2.

Accelerate vehicle in the “D” position (3rd 

Þ

 4th gear).

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3. 

CHECK POWER SOURCE CIRCUIT

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 4.

NG

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

PCIA0067E

Solenoid valve

Connector 

No.

Terminal No. 

(Wire color)

Voltage

Front brake solenoid 
valve

OFF

F104

35 (B/Y) - Ground

Battery voltage

ON

Approx. 0 V

PCIA0066E

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F104

35 (B/Y)

Yes

A/T unit assembly harness 
connector

F26

3 (B/Y)

SCIA3097E

AT-222

DTC P1841 ATF PRESSURE SWITCH 1

4. 

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 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.

5. 

CHECK DTC

Perform DTC confirmation procedure. Refer to  

AT-179, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6. 

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 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

3 (G)

Yes

Control valve assem-
bly harness connec-
tor

F302

12 (G)

SCIA3098E

DTC P1843 ATF PRESSURE SWITCH 3

AT-223

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DTC P1843 ATF PRESSURE SWITCH 3

PFP:25240

Description

ECS0088N

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

On Board Diagnosis Logic

ECS0088O

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

Diagnostic trouble code “ATF PRES SW 3/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 3 is
irregular during depressing accelerator pedal. (Other than during shift change)

Possible Cause

ECS0088P

ATF pressure switch 3

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

DTC Confirmation Procedure

ECS0088Q

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 (I/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 (P1843) is detected, go to 

AT-225, "Diagnostic Proce-

dure"

 .

If DTC (P1752) is detected, go to 

AT-172, "Diagnostic Procedure"

 .

SAT014K

AT-224

DTC P1843 ATF PRESSURE SWITCH 3

Wiring Diagram — AT — FPSW3

ECS0088R

TCM terminals and data are reference value.

TCWM0029E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

4

P/L

SEL3
(pressure switch 3)

40

Y/G

DATA BIT1

 

 

 

 

 

 

 

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