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DTC    P0851-579    Park / Neutral Switch Input Circuit Low

DTC    P0852-580    Park / Neutral Switch Input Circuit High

for Preparation Click here


DESCRIPTION

  1. 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.
  2. 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 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 P position switch (transmission shift main switch) operation according to this resistance signal.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0851
579
GND short in P position switch circuit
  1. Wire harness or connector
  2. P position switch (Transmission shift main switch)
  3. Power management control ECU
P0852
580
Open or +B short in P position switch circuit

WIRING DIAGRAM


A216493E07

Refer to the wiring diagram for DTC P0AE6-225 .

INSPECTION PROCEDURE

1.INSPECT P POSITION SWITCH

  1. Disconnect connector H81 from the P position switch (transmission shift main switch).



    A216509E12

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H81-4 (S) - H81-2 (E)
    		Switch pressed
    		680 Ω
    H81-4 (S) - H81-2 (E)
    		Switch released
    		4580 Ω

    Text in Illustration 
    *a
    		Component without harness connected
    (P Position Switch (Transmission Shift Main Switch))

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

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



NG
REPLACE P POSITION SWITCH
OK


2.CHECK HARNESS AND CONNECTOR (+B SHORT)


    A248780E01

  1. Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room junction block assembly.
    Text in Illustration 
    *1
    		Engine Room Junction Block Assembly
    *2
    		AM2 Fuse
    *3
    		IGCT NO. 2 Fuse

  1. Disconnect connector H81 from the P position switch (transmission shift main switch).



    A243895E13

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H3-16 (P1) - A19-2 (+B2)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-5 (+B1)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H3-1 (AM22)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-7 (AM21)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-6 (MREL)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-1 (IG2)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-1 (ACCD)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-2 (IG1D)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-2 (IG2D)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H3-14 (SPDI)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A19-16 (GI)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A19-4 (FCTL)
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Component with harness connected
    (Power Management Control ECU)

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

  1. Install the IGCT NO. 2 fuse and AM2 fuse.



NG
Go to step 5
OK


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

  1. Disconnect connector H3 from the power management control ECU.

  1. Disconnect connector H81 from the P position switch (transmission shift main switch).



    A217102E04

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    H3-16 (P1) - H81-4 (S)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    H3-16 (P1) or H81-4 (S) - Body ground and other terminals
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Power Management Control ECU)
    *b
    		Front view of wire harness connector
    (to P Position Switch (Transmission Shift Main Switch))

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

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

  1. Connect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect connector H81 from the P position switch (transmission shift main switch).



    C208992E11

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    H81-2 (E) - Body ground
    		Power switch off
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to P Position Switch (Transmission Shift Main Switch))

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



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)  

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


    A248780E01

  1. Remove the IGCT NO. 2 fuse and AM2 fuse from the engine room junction block assembly.
    Text in Illustration 
    *1
    		Engine Room Junction Block Assembly
    *2
    		AM2 Fuse
    *3
    		IGCT NO. 2 Fuse

  1. Disconnect connector H81 from the P position switch (transmission shift main switch).

  1. Disconnect all the connectors from the power management control ECU.



    A238662E31

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H3-16 (P1) - A19-2 (+B2)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-5 (+B1)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H3-1 (AM22)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-7 (AM21)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-6 (MREL)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-1 (IG2)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-1 (ACCD)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H4-2 (IG1D)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A20-2 (IG2D)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - H3-14 (SPDI)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A19-16 (GI)
    		Power switch off
    		10 kΩ or higher
    H3-16 (P1) - A19-4 (FCTL)
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Power Management Control ECU)

  1. Connect the power management control ECU connectors.

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

  1. Install the IGCT NO. 2 fuse and AM2 fuse.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)