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

C279535E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. INSPECT AMT RELAY

    1. C149624E17

      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. C195876C06

      *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

    REPLACE TCMClick 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. C239994C09

      *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

    REPLACE TCMClick 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 hereClick here

      for RHD:Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  9. PERFORM INITIALIZATION

    1. Perform the initialization and learning procedure.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    END