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DTC No. P1A4B-11 Parking Switch (Sub) Circuit-low
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON.
Judgment Criterion
  • The voltage of shift sensor 10 is low.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • Malfunction of the selector lever
  • Malfunction of the PHEV-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
1.Voltage measurement at selector lever connector (SF10 terminal)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
(3) Measure the voltage between the selector lever connector (SF10 terminal) and body ground.
OK: Approximately 5 V
Is the check result normal?
 
2.Check of short to ground circuit in SF10 line between PHEV-ECU and selector lever
Is the check result normal?
Repair the connector(s) or wiring harness.
 
3.Voltage measurement at selector lever connector (SF10 terminal)
(1) Measure the selector lever connector side by backprobing.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
(3) Measure the voltage between the selector lever connector (SF10 terminal) and body ground.
Check conditionNormal condition
Parking lock switch: ON2.98 ± 0.3 V
Parking lock switch: OFF1.6 ± 0.5 V
Is the check result normal?
Replace the selector lever (Refer to Transaxle - Selector Lever REMOVAL AND INSTALLATION).
 
4.Check whether the DTC is set again.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION).
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).