Inspection Procedure 6: Vehicle power cannot be turned OFF when the shift position is in "P." (Power supply mode ON to ACC is possible)


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Damaged wiring harness or connector (short to earth in PDSW line)
  • Malfunction of selector lever assembly (ON seizure of P range detection switch)
  • Malfunction of OSS-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 2. Check of short to earth in PDSW line between selector lever assembly connector and OSS-ECU connector


note Because the conformity cannot be determined even when the digital tester is used to measure the voltage of PDSW line between the selector lever assembly connector and OSS-ECU connector, be sure to use the oscilloscope. (Outputs the sawtooth waveform of 0 to 5 V with intervals of 10 ms.)

Q. Is the check result normal?





STEP 3. Check of selector lever assembly (P range detection switch)



Terminal No.
 Operation state
 Normal conditions
4 - 6
 Selector lever: P position
 No continuity
Selector lever: Other than P position
 Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 4. M.U.T.-III data list




  • Operate the selector lever.
Operation state
 Item No.
 Check item
 Display
Selector lever: P position
 8
 P range detect SW
 Outside park
Selector lever: Other than P position
 Park
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?