P0852

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0851-579: Park / Neutral Switch Input Circuit Low

DTC P0851-579 - Park / Neutral Switch Input Circuit Low

DTC P0852-580 - Park / Neutral Switch Input Circuit High

DESCRIPTION

Instead of having a parking position as one of the positions of the conventional shift lever, a P position switch is provided independently in the upper area of the selector lever. The switch is based on a momentary type operation mode, in which the button does not lock mechanically.
The P position switch contains resistors R1 and R2. When the P position switch is not pressed, the switch provides a combined resistance of R1 and R2; and when the P position switch is pressed, the switch provides only the resistance of R1. The voltage at the P1 terminal of the HV control ECU varies with the changes in the resistance of the switch. The HV control ECU determines the P position switch operation intended by the driver according to this resistance signal.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT P POSITION SWITCH




(a) Remove the P position switch.
(b) Measure the resistance between the terminals of the P position switch connector.
Standard resistance:





(c) Reinstall the P position switch.
NG -- REPLACE P POSITION SWITCH
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - P POSITION SWITCH)




(a) Disconnect the H15 HV control ECU connector.




(b) Disconnect the M11 P position switch connector.
(c) Turn the power switch ON (IG).
(d) Measure the voltage between the terminal of the HV control ECU connector and body ground.
Standard voltage:





(e) Turn the power switch OFF.
(f) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):





Standard resistance (Check for short)





(g) Reconnect the P position switch connector.
(h) Reconnect the HV control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (P POSITION SWITCH - BODY GROUND)




(a) Disconnect the M11 P position switch connector.
(b) Measure the resistance between the terminal of the P position switch connector and body ground.
Standard resistance (Check for open):





(c) Reconnect the P position switch connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU