P0851

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0851-579,P0852-580: Park / Neutral Switch Input Circuit Low
P0852-580 - Park / Neutral Switch Input Circuit High

DESCRIPTION

* Instead of having a parking position as one of the positions of the conventional selector lever, a transmission shift main switch (P position switch) is provided independently above the selector lever. The switch is a momentary type, in which the button does not lock mechanically.

* The transmission shift main switch (P position switch) contains resistors R1 and R2. When the transmission shift main switch (P position switch) is not pressed, the switch provides a combined resistance of R1 and R2; and when the transmission shift main switch (P position switch) is pressed, the switch provides only the resistance of R1. The voltage at the P1 terminal of the power management control ECU (HV CPU) varies with the changes in the resistance of the switch. The power management control ECU (HV CPU) determines the transmission shift main switch (P position switch) operation according to this resistance signal.





WIRING DIAGRAM





Refer to the wiring diagram for DTC P0AE6-225 P0AE6.

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TRANSMISSION SHIFT MAIN SWITCH (P POSITION SWITCH)

(a) Disconnect connector b1 from the transmission shift main switch (P position switch).

(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





HINT
Terminals No. 1 and No. 8 on the component side connector are empty.

(c) Connect the transmission shift main switch (P position switch) connector.

NG -- REPLACE TRANSMISSION SHIFT MAIN SWITCH
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (+B SHORT)

(a) Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room junction block assembly.





Text in Illustration





(b) Disconnect connector b1 from the Transmission shift main switch (P position switch).

(c) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





(d) Connect the Transmission shift main switch (P position switch) connector.

(e) Install the IGCT NO. 2 fuse and AM2 fuse.

NG -- CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - P POSITION SWITCH)

(a) Disconnect connector L5 from the power management control ECU.

(b) Disconnect connector b1 from the transmission shift main switch (P position switch).

(c) Measure the resistance according to the value(s) in the table below.





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





HINT
As necessary, check that there is no short to power supply wires when performing the above wire harness inspection.

(d) Connect the transmission shift main switch (P position switch) connector.

(e) Connect the power management control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect connector b1 from the transmission shift main switch (P position switch).

(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance (Check for Open):





Text in Illustration





(c) Connect the transmission shift main switch (P position switch) connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components

5. CHECK HARNESS AND CONNECTOR (SHORT TO POWER SUPPLY WIRES)

(a) Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room junction block assembly.





Text in Illustration





(b) Disconnect connector b1 from the transmission shift main switch (P position switch).

(c) Disconnect all the connectors from the power management control ECU.

(d) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





(e) Connect the power management control ECU connectors.

(f) Connect the transmission shift main switch (P position switch) connector.

(g) Install the IGCT NO. 2 fuse and AM2 fuse.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Components