MULTI-MODE MANUAL TRANSAXLE SYSTEM, Diagnostic DTC:P0885, P0887

DTC Code DTC Name
P0885 TCM Power Relay Control Circuit / Open
P0887 TCM Power Relay Control Circuit (Short)

DESCRIPTION

The multi-mode manual transaxle system has a dedicated power supply circuit. While the ignition switch is turned to ON, the TCM outputs the power from the MREL terminal to operate the MMT relay. Then, the power is supplied to the +BM terminal of the TCM through the MMT relay. The voltage (+BM) is monitored and when it is low (4.00 V or less) despite the voltage being supplied to the MREL circuit, the TCM determines that there is a malfunction in the multi-mode manual transaxle system and sets a DTC. When the voltage (+BM) is high (4.00 V or more) although the voltage is not supplied to the MREL circuit, the TCM sets a DTC.

DTC No. DTC Detecting Condition Trouble Area
P0885

The TCM detects the following conditions simultaneously:

(1-trip detection logic)


  1. Voltage is supplied to MREL circuit.

  2. +BM voltage is less than 4.00 V for 0.5 seconds.

  • MMT fuse

  • MMT relay

  • Open in MREL signal circuit

  • Open in PGND signal circuit

  • Open in +BM signal circuit

  • TCM
P0887

The TCM detects the following conditions simultaneously:

(1-trip detection logic)


  1. No voltage is supplied to MREL circuit.

  2. +BM voltage is more than 4.00 V for 0.1 seconds.

  • MMT relay

  • Short in MREL signal circuit

  • Short in PGND signal circuit

  • Short in +BM signal circuit

  • TCM

WIRING DIAGRAM

A005IX1E04
*a FL MAIN
*b BATTERY

PROCEDURE


  1. INSPECT MMT RELAY


    1. A005KCNE13

      Remove the MMT relay from the engine room relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Apply the battery voltage between terminals 1 and 2 Below 1 Ω

    3. Reinstall the MMT relay.


    NG

    REPLACE MMT RELAY

    OK

  2. INSPECT TCM (+BM TERMINAL INPUT VOLTAGE)


    1. A005GE5E02
      Text In Illustration
      *a

      Front view of wire harness connector

      (to TCM)

      Disconnect the A46 TCM connector.

    2. Measure the voltage between the terminal of the TCM and the body ground when the ignition switch is turned ON and off.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A46-2 (+BM) - A46-1 (PGND) Ignition switch off Below 1 V
      A46-2 (+BM) - A46-1 (PGND) Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE TCM Click here

    A

  3. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)


    1. Disconnect the A46 TCM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A46-1 (PGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT TCM (MREL TERMINAL OUTPUT VOLTAGE)


    1. A005LQYE02
      Text In Illustration
      *a

      Component with harness connected

      (TCM)

      Measure the voltage between the terminal of the TCM and the body ground when the ignition switch is turned ON and off.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A47-5 (MREL) - Body ground Ignition switch off Below 1 V
      A47-5 (MREL) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPLACE TCM Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (TCM - MMT RELAY)


    1. Disconnect the A46 and A47 TCM connectors.

    2. Turn the ignition switch off.

    3. Remove the MMT relay from the engine room sub relay block.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      A47-5 (MREL) - MMT relay (1) Always Below 1 Ω
      A46-2 (+BM) - MMT relay (5) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      A47-5 (MREL) or MMT relay (1) - Body ground Always 10 kΩ or higher
      A46-2 (+BM) or MMT relay (5) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BATTERY - MMT RELAY)


    1. A005JTYE01
      Text In Illustration
      *1 Engine room sub relay block
      *2 MMT relay Holder

      Remove the MMT relay from the engine room sub relay block.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      MMT relay (terminal 3) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (MMT RELAY - BODY GROUND)


    1. Remove the MMT relay from the engine room sub relay block.

    2. Turn the ignition switch off.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      MMT relay (terminal 2) -Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE TCM


    1. Replace the TCM Click here.


    NEXT

  9. PERFORM INITIALIZATION


    1. Perform the initialization and learning for multi-mode manual transaxle system Click here.


    NEXT

    END