Code No. P081D: Neutral Position Switch Circuit




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. item 8: Neutral position switch

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Continuity check on B-129 neutral position switch connector.



  • Disconnect connector, and check at switch side.
  • Continuity check between terminals.
OK:
    Continuity (Gearshift lever position: Neutral)
    No continuity (Gearshift lever position: Except neutral)

Q. Is the check result normal?

Go to Step 5.
Go to Step 3.

STEP 3. Check the installation state of the neutral position switch.


Q. Is the check result normal?

Go to Step 4.
Repair.

STEP 4. Check the neutral position switch itself.



  • Check the neutral position switch itself (Refer to GROUP 22A - On-vehicle service - Neutral Position Switch Check ).

Q. Is the check result normal?

The area affecting the neutral position switch inside the transmission can possibly be abnormal. Overhaul and repair the transmission, or change the transmission.
Replace the neutral position switch.

STEP 5. Perform voltage measurement at B-129 neutral position switch connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal ETACS-ECU +B1 terminal and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6.
Repair the connector(s), or check short to earth, and open circuit in +B1 line between ETACS-ECU connector and neutral position switch connector.

STEP 6. Check of harness damage in +B1 line between ETACS-ECU connector and neutral position switch connector.


Q. Is the check result normal?

Go to Step 7.
Repair the connector(s) or wiring harness.

STEP 7. Check of short to earth, open circuit and harness damage in NTSW line between neutral position switch connector and AS&G-ECU connector.



  • Check output line for open/short circuit and damage.

Q. Is the check result normal?

Go to Step 8.
Repair the damaged harness wire.

STEP 8. M.U.T.-III diagnosis code



  • Reconfirmation of the diagnosis code.

Q. Is the diagnosis code set?

Replace the AS&G-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).