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DTC P0820: Shift lever POS.(main) circuit
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets this DTC when it detects an unfeasible shift position.
 
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of selector lever assembly (Shift sensor or select sensor).
  • Malfunction of the PHEV-ECU.
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the selector lever assembly related DTC is set in the PHEV-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 2.
 
STEP 2. Check the signal line for open circuit and short circuit. (PHEV-ECU and selector lever assembly).
Check the wiring harness PHEV-ECU connectors (terminals SLS, SFV, SFG, SFS) and selector lever assembly (terminals No.5, No.9, No.8, No.7).
Is the check result normal?
Go to Step 3.
Repair the connector or wiring harness.
 
STEP 3. Selector lever assembly check
Refer to GROUP 22A - Selector Lever Assembly Operation Check .
Is the check result normal?
Go to Step 4.
Replace the selector lever assembly (Refer to GROUP 22A - Selector Lever ).
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).