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DTC P1112: Stoplight ON circuit (PHEV-ECU)
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
DTC SET CONDITIONS
The PHEV-ECU sets the DTC when it detects a malfunction of stop light illuminate circuit.
 
 
 
PROBABLE CAUSES
  • Damaged harness or connector.
  • Malfunction of the ETACS-ECU.
  • Malfunction of the PHEV-ECU.
 
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Check the stop light switch.
The stop lights should illuminate when the brake pedal is depressed.
Is the check result normal?
Go to Step 2.
Carry out troubleshooting for the stop lights (Refer to GROUP 54A - Rear Combination light ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the actuator test.
When the actuator test is performed, the stop lights should illuminate (Refer to ).
  • Item No. 21: Stop light actuate
 
Inspection conditionDrive contentItem
  • Power supply mode of electric motor switch: ON
  • Vehicle speed: 0 km/h (0 mph)
When the actuator test is started, the stop light illuminates.ON/OFF
Is the check result normal?
Go to Step 4.
Go to Step 3.
 
STEP 3. Check of short to power supply circuit, short to ground circuit, and open circuit in SLPD line between PHEV-ECU connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Check of short to power supply circuit, short to ground circuit, and open circuit in EMVS line between PHEV-ECU connector and stop light connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. 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) Execute the actuator test (Refer to ).
  • Item No. 21: Stop light actuate
 
Inspection conditionDrive contentItem
  • Power supply mode of electric motor switch: ON
  • Vehicle speed: 0 km/h (0 mph)
When the actuator test is started, the stop light illuminates.ON/OFF
(5) Check the DTC.
Is the DTC set?
Replace the PHEV-ECU (Refer to ).
This diagnosis is complete.