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

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 above 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 power management control ECU varies with the changes in the resistance of the switch. The power management control ECU determines the P position switch (transmission shift main 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 P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH)

   
   

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

   2. 

      Text in Illustration

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

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

      Standard Resistance
      Tester Connection 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. Reconnect the b1 P position switch (transmission shift main switch) connector.

   
   

   NG

   REPLACE P POSITION SWITCH (TRANSMISSION SHIFT MAIN SWITCH)

   OK

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

   
   

   1. Disconnect the L5 power management control ECU connector.

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

   3. 

      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))

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

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

      Standard Resistance (Check for Short)
      Tester Connection 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. Reconnect the b1 P position switch (transmission shift main switch) connector.

   5. Reconnect the L5 power management control ECU connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

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

   2. 

      Text in Illustration

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

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

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

   3. Reconnect the b1 P position switch (transmission shift main switch) connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE POWER MANAGEMENT CONTROL ECU Click here