HYBRID CONTROL SYSTEM, Diagnostic DTC:P0851-579, P0852-580

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 Click here.

INSPECTION PROCEDURE

PROCEDURE

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

   
   

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

   2. 

      Text in Illustration

      *1	Component without harness connected (Transmission Shift Main Switch (P Position Switch))

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition b1-4 (S) - b1-2 (E) Switch pressed 680 Ω b1-4 (S) - b1-2 (E) Switch released 4580 Ω

      Tech Tips

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

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

   
   

   NG

   REPLACE TRANSMISSION SHIFT MAIN SWITCH

   OK

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

   
   

   1. Disconnect connector L5 from the power management control ECU.

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

   3. 

      Text in Illustration

      *1	Rear view of wire harness connector (to Power Management Control ECU)
      *2	Front view of wire harness connector (to Transmission Shift Main Switch (P Position Switch))

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition L5-16 (P1) - b1-4 (S) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Switch Condition Specified Condition L5-16 (P1) or b1-4 (S) - Body ground and other terminals Power switch off 10 kΩ or higher

      Tech Tips

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

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

   5. Connect the power management control ECU connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

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

   2. 

      Text in Illustration

      *1	Front view of wire harness connector (to Transmission Shift Main Switch (P Position Switch))

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition b1-2 (E) - Body ground Power switch off Below 1 Ω

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

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE POWER MANAGEMENT CONTROL ECU Click here