MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0821

DTC Code DTC Name
P0821 Gear Lever "X" Position Circuit

DESCRIPTION

Based on the signal from the transmission shift main switch, the transmission control ECU detects whether the shift lever position is in the E or M position. If the shift lever position switch is ON despite the shift lever position being N or R, the transmission control ECU sets the DTC.

DTC No. DTC Detection Conditions Trouble Areas
P0821

The transmission control ECU detects the following conditions simultaneously:

(1 trip detection logic)


  1. Shift lever position is in N or R

  2. MSDW signal is ON for 1.0 second

  • Transmission shift main switch (built into shift lever assembly)

  • Short in MDSW signal circuit

  • Transmission control ECU

WIRING DIAGRAM

A01371QE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT TRANSMISSION SHIFT MAIN SWITCH

    A0138UIE02

    1. Disconnect the shift lever assembly connector.

    2. Check the resistance when changing the shift lever position.

      Standard Resistance
      Tester Connections Shift Lever Position Specified Conditions
      MDSW (C40-4) - GND (C40-8) R, N or E 10 kΩ or higher
      MDSW (C40-4) - GND (C40-8) M, + or - Below 1 Ω

    3. Reconnect the shift lever assembly connector.


    NG

    REPLACE TRANSMISSION SHIFT MAIN SWITCH

    OK

  2. CHECK HARNESS AND CONNECTOR (TRANSMISSION SHIFT MAIN SWITCH - TRANSMISSION CONTROL ECU)

    A0137YHE03

    1. Disconnect the shift lever assembly connector.

    2. Disconnect the transmission control ECU connector.

    3. Check the resistance.

      Standard Resistance
      Tester Connections Specified Conditions
      MDSW (A27-10) - MDSW (C40-4) Below 1 Ω
      MDSW (A27-10) - Body ground 10 kΩ or higher

    4. Reconnect the shift lever assembly connector.

    5. Reconnect the transmission control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A0138FSE02

    1. Disconnect the shift lever assembly connector.

    2. Check the resistance.

      Standard Resistance
      Tester Connections Specified Conditions
      GND (C40-8) - Body ground Below 1 Ω

    3. Reconnect the shift lever assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TRANSMISSION CONTROL ECU ASSEMBLY