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 condition	Normal condition
Parking lock switch: ON	2.98 ± 0.3 V
Parking lock switch: OFF	1.6 ± 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