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Inspection Procedure 15: Vehicle power cannot be turned "OFF" when the shift position is in "P" (Power supply mode "ON" to "ACC" is possible)
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
When the shift position is judged to be in the P position based on the input of P range detection switch, KOS&OSS-ECU can turn "OFF" the vehicle power supply. If the vehicle power cannot be turned "OFF" (power supply mode ON to ACC is possible) when the shift is in P position, the P range detection switch or KOS&OSS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector (short to ground in PDSW line)
  • Malfunction of selector lever assembly (ON seizure of P range detection switch)
  • Malfunction of KOS&OSS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Check if the DTC is set in the KOS&OSS-ECU.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Refer to diagnostic trouble code chart .
Go to Step 2.
 
STEP 2. Check of short to ground in PDSW line between selector lever assembly connector and KOS&OSS-ECU connector.
noteBecause 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 KOS&OSS-ECU connector, be sure to use the oscilloscope (Outputs the sawtooth waveform of 0 to 5 V with intervals of 10 ms).
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check of selector lever assembly (P range detection switch).
Disconnect the selector lever assembly connector, and check the continuity at the equipment side.
 
Operation stateTerminal No.Normal conditions
Selector lever: P position4 - 6No continuity
Selector lever: Other than P positionContinuity exists (2 ohms or less)
Is the check result normal?
Go to Step 4.
Replace the selector lever assembly.
 
STEP 4. Using scan tool (M.U.T.-III), check data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect the Scan Tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "OFF".
(3) Check the KOS&OSS-ECU data list.
  • Operate the selector lever.
 
Item No.Check itemOperation stateDisplay
24P range detect SWSelector lever: P positionOutside park
Selector lever: Other than P positionPark
OK: Operation state and data list display agree with each other.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the KOS&OSS-ECU and register the VIN (Refer to ).