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. When 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 stores 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 stores the DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Memory
P0885 TCM Power Relay Control Circuit / Open

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.

  • AMT fuse

  • AMT relay

  • Open in MREL signal circuit

  • Open in PGND signal circuit

  • Open in +BM signal circuit

  • TCM

 Does not come on Comes on DTC stored
P0887 TCM Power Relay Control Circuit (Short)

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.

  • AMT relay

  • Short in MREL signal circuit

  • Short in PGND signal circuit

  • Short in +BM signal circuit

  • TCM

 Does not come on Comes on DTC stored

WIRING DIAGRAM

A01TD46E01
*a FL MAIN
*b Battery

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT AMT RELAY


    1. A01T91BE17

      Remove the AMT relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the MMT relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AMT RELAY

    OK

  2. INSPECT TCM (+BM TERMINAL INPUT VOLTAGE)


    1. A01TB5RC06
      *a

      Front view of wire harness connector

      (to TCM)

      Disconnect the TCM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A104-2 (+BM) - A104-1 (PGND) Ignition switch off Below 1 V
      A104-2 (+BM) - A104-1 (PGND) Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      NG A
      OK B

    B

    GO TO STEP 8 Click here

    A

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A104-1 (PGND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT TCM (MREL TERMINAL OUTPUT VOLTAGE)


    1. Reconnect the TCM connectors.

    2. Turn the ignition switch to ON.

    3. A01TD8TC09
      *a

      Component with harness connected

      (TCM)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A108-5 (MREL) - Body ground Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 8 Click here

    OK

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


    1. Disconnect the TCM connectors.

    2. Remove the AMT relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A108-5 (MREL) - AMT relay (1) Always Below 1 Ω
      A104-2 (+BM) - AMT relay (5) Always Below 1 Ω
      A108-5 (MREL) or AMT relay (1) - Body ground Always 10 kΩ or higher
      A104-2 (+BM) or AMT relay (5) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      AMT relay (terminal 3) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AMT relay (terminal 2) -Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE TCM


    1. Replace the TCM.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. PERFORM INITIALIZATION


    1. Perform the initialization and learning procedure.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END