HYBRID CONTROL SYSTEM, Diagnostic DTC:P3110-139

DTC Code DTC Name
P3110-139 HV Main Relay

DESCRIPTION

The hybrid vehicle control ECU monitors the ST CUT/IGCT2 relay and detects the following malfunction.

DTC No. INF Code DTC Detection Condition Trouble Area
P3110 139 Short to +B in the ST CUT/IGCT2 relay drive signal circuit

  • Wire harness or connector

  • Relay

  • Hybrid vehicle control ECU

WIRING DIAGRAM

A01GZPKE03

INSPECTION PROCEDURE

Tech Tips

If battery voltage is applied to terminal MREL of the hybrid vehicle control ECU, even though the power switch is off, +B power source voltage will be applied to terminals +B and +B2 of the hybrid vehicle control ECU.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ENGINE ROOM NO. 2 RELAY BLOCK)


    1. Disconnect connector A76 from the hybrid vehicle control ECU.

    2. Turn the power switch on (IG).

    3. A01H26FE08

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

      Note

      Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A76-3 (MREL) - Body ground Power switch on (IG) Below 1 V

    NG

    CHECK RELAY (ST CUT/IGCT2 RELAY) Click here

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  2. CHECK RELAY (ST CUT/IGCT2 RELAY)


    1. Turn the power switch off.

    2. A01H1JXE03

      Remove the ST CUT/IGCT2 relay from the engine room No. 2 relay block.

    3. A01GZ8X

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always Below 1 Ω
      3 - 5 Battery voltage is not applied between terminals 1 and 2. 10 kΩ or higher
      Battery voltage is applied between terminals 1 and 2. Below 1 Ω

    NG

    REPLACE RELAY (ST CUT/IGCT2 RELAY)

    OK

  3. CHECK RELAY (ST/IGCT RELAY)


    1. Turn the power switch off.

    2. A01H0YLE01

      Remove the ST/IGCT relay from the engine room No. 2 relay block.

    3. A01GZ8X

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

      Standard resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always Below 1 Ω
      3 - 5 Battery voltage is not applied between terminals 1 and 2. 10 kΩ or higher
      Battery voltage is applied between terminals 1 and 2. Below 1 Ω

    NG

    REPLACE RELAY (ST/IGCT RELAY)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR