AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P0812

DTC Code DTC Name
P0812 Reverse Input Circuit

DESCRIPTION

The park/neutral position switch detects the shift lever position and sends signals to the TCM.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0812

  1. Battery voltage is 9.5 V or higher, shift lever in R and DTC P0705 is not detected

  2. R terminal voltage is low

  3. 5 times

  4. 1-trip detection logic

  • Open or short in park/neutral position switch assembly circuit

  • Park/neutral position switch assembly

  • TCM

  1. Battery voltage is 9.5 V or higher, shift lever in D and DTC P0705 is not detected

  2. R terminal voltage is high

  3. 5 times

  4. 1-trip detection logic

  • Short in park/neutral position switch assembly circuit

  • Park/neutral position switch assembly

  • TCM

MONITOR DESCRIPTION

This DTC indicates a problem the park/neutral position switch assembly or the wire harness in the park/neutral position switch assembly circuit.

The park/neutral position switch assembly detects the shift lever position and sends signals to the TCM.

For safety, the park/neutral position switch assembly detects the shift lever position so that the engine can be started only when the shift lever is in P or N.

The park/neutral position switch assembly sends signals to the TCM according to the shift lever position (P, N, R or D).

The TCM determines that there is a problem with the switch or related parts if it receives an R position signal when the shift lever is in D or it does not receives an R position signal when the shift lever is in R. The TCM stores the DTC.

WIRING DIAGRAM

Refer to DTC P0705 Click here.

CAUTION / NOTICE / HINT

Note


  • Perform registration and/or initialization when parts related to the automatic transmission are replaced Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the engine switch on (IG).

  2. Wait for 5 seconds or more with the shift lever in D.

  3. Wait for 5 seconds or more with the shift lever in R.

  4. Check for DTCs again Click here.

PROCEDURE


  1. CHECK PARK/NEUTRAL POSITION SWITCH ASSEMBLY (POWER SOURCE)


    1. B001A5YE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Park/Neutral Position Switch Assembly)

      Disconnect the park/neutral position switch assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C19-1 (RB) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - BATTERY)

    OK

  2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. B001B49E02
      Text in Illustration
      *a

      Component without harness connected

      (Park/Neutral Position Switch Assembly)

      Disconnect the park/neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (RB) - 2 (RL) Shift lever in R Below 1 Ω
      1 (RB) - 2 (RL) Shift lever not in R 10 kΩ or higher
      3 (B) - 2 (RL) Shift lever in P, R, N, D and S 10 kΩ or higher
      6 (IG) - 2 (RL) Shift lever in P, R, N, D and S 10 kΩ or higher

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - TCM)


    1. Disconnect the C19 park/neutral position switch assembly connector.

    2. Disconnect the A74 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C19-2 (RL) - A74-5 (R) Always Below 1 Ω
      C19-2 (RL) or A74-5 (R) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE TCM Click here

    B

    REPLACE TCM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR