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 shift lever, a P position switch (transmission shift main switch) is provided independently below the shift lever. The switch is a momentary type, in which the button does not lock mechanically.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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

(a) Disconnect connector F1 from the P position switch (transmission shift main 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 P position switch (transmission shift main switch) connector.

NG -- REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH)
OK -- Continue to next step.

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

(a) Disconnect connector A58 from the hybrid vehicle control ECU.

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

(c) Turn the power switch on (IG).

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





Standard Voltage:





Text in Illustration





NOTICE:
Turning the power switch on (IG) with the hybrid vehicle control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(e) Turn the power switch off.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





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

(h) Connect the hybrid vehicle 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 connector from the P position switch (transmission shift main 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 P position switch (transmission shift main switch) connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components