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DTC P1998: Shift sensor(sub) circuit high
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets this DTC when the sub signal circuit in the shift sensor fails.
 
 
 
PROBABLE CAUSES
  • The selector lever assembly fails (shift sensor fails).
  • Damaged harness or connector.
  • 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 the data list. <PHEV-ECU>
Check that the following data list display contents are normal (Refer to ).
Data list
  • Item No.148: Shift sensor 2
 
Check conditionNormal condition
The selector lever is at the R position with the power supply mode of the electric motor switch turned on.3.7 - 4.2 V
The selector lever is at the H (home)/N position with the power supply mode of the electric motor switch turned on.2.3 - 2.7V
The selector lever is at the D/B position with the power supply mode of the electric motor switch turned on.0.79 - 1.29 V
Is the check result normal?
Go to Step 4.
Go to Step 2.
 
STEP 2. Check of short to power supply circuit in the signal line (Selector lever assembly and PHEV-ECU).
Check the wiring harness selector lever assembly connector (terminals No.10, No.3) and PHEV-ECU connector (terminals SFVS, SFSS).
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 Check .
Is the check result normal?
Go to Step 4.
Replace the selector lever assembly (Refer to GROUP 22A - Selector Lever Assembly ).
 
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 ).