Code No. P0705: Inhibitor Switch System












DIAGNOSIS CODE SET CONDITIONS


When the battery voltage is 2V or more

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Check the A/T-ECU terminal voltage.
[C-138 A/T-ECU connector (vehicle side, connected)]
Turn ON the ignition switch, and check by shifting to each range.

  • "P" range: Terminal No. 6 to body earth → System voltage
  • "R" range: Terminal No. 7 to body earth → System voltage
  • "N" range: Terminal No. 21 to body earth → System voltage
  • "D" range: Terminal No. 8 to body earth → System voltage

Q. Is the check result normal?
Go to Step 6.
Go to Step 2.

STEP 2. Check the path between the ignition switch and the inhibitor switch.
Turn OFF the ignition switch, and check the following items.

  • Open/short circuit of wiring harness between the ignition switch and B-121 inhibitor switch connector terminal No. 3.
  • Blown fuse

Q. Is the check result normal?
Go to Step 3.
Repair or replace the failure section.

STEP 3. Check the wiring harness between the inhibitor switch and A/T-ECU.
Check for continuity between B-121 inhibitor switch terminals and C-138 A/T-ECU terminals.

  • Between B-121 terminal No. 2 and C-138 terminal No. 6: At the "P" range, continuity exists.
  • Between B-121 terminal No. 9 and C-138 terminal No. 7: At the "R" range, continuity exists.
  • Between B-121 terminal No. 8 and C-138 terminal No. 21: At the "N" range, continuity exists.
  • Between B-121 terminal No. 5 and C-138 terminal No. 8: At the "D" range, continuity exists.
When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness.

Q. Is the check result normal?
Go to Step 4.
Repair or replace the failure section.

STEP 4. Check the inhibitor switch as a single unit.
Refer to .

Q. Is the check result normal?
Go to Step 5.
Go to Step 7.

STEP 5. Check the A/T-ECU connector pin terminal and the connection status.

Q. Is there a failure point?
Repair or replace the failure section.
Replace the A/T-ECU.

STEP 6. Erase the diagnosis code, and drive the vehicle for a while.
Check that the normal code is displayed.

Q. Is the check result normal?
The procedure is complete.
Replace the A/T-ECU.

STEP 7. Adjust the inhibitor switch.
Refer to .
After adjustment, check the continuity between the terminals again.

Q. Is the check result normal?
Go to Step 8.
Replace the inhibitor switch.

STEP 8. Erase the diagnosis code, and drive the vehicle for a while.
Check that the normal code is displayed.

Q. Is the check result normal?
The procedure is complete.
Return to START.