ECD SYSTEM, Diagnostic DTC:P1349, P1350, P1351, P1352

DTC Code DTC Name
P1349 Short to B+ in Glow Relay Circuit
P1350 Open or Short to GND in Glow Relay Circuit
P1351 Glow Relay Coherency Test (Open Relay)
P1352 Glow Relay Coherency Test (Latched Relay)

DESCRIPTION

The glow plugs operate to improve cold engine starting performance, and to prevent a drop in emission control efficiency. The glow plug is controlled by the glow plug relay, which is controlled by the ECM.


The glow plug relay provides the power function used to activate the plugs and also the plug diagnostic function (short circuit, etc.).


  1. Pre-heating


    1. This lasts for as long as the glow indicator light is on, and it depends on the engine coolant temperature and battery voltage.

      Example
      Engine coolant temperature Pre-heating time
      Less than 5°C (41°F) 5 sec. or more

    2. After the light has gone off


      1. If the starter motor is activated and the engine coolant temperature is less than 9°C (78.2°F), the plugs are powered for the whole time the starter motor is being activated, which limited to 1 min.

  2. Post heating


    1. Post heating comes into effect when the engine starts. Post heating time depends on the engine coolant temperature.

      Example
      Engine coolant temperature Pre-heating time
      Less than 40°C (104°F) 5 min.
      45°C (113°F) or more 0 min.
      A0136DOE01
DTC No. DTC Detection Condition Trouble Area Possible to Detect
Ignition Switch Engine Run
P1349 Short in glow plug circuit to battery power source for 2 sec. or more.

  • Glow plug relay

  • Glow plug relay circuit

  • ECM

  • Glow plug

 ON ON
P1350 Open or short in glow plug circuit for 2 sec. or more.

  • Glow plug relay

  • Glow plug relay circuit

  • ECM

  • Glow plug

 ON ON
P1351 Glow plug relay not commanded and glow on for 5 sec. or more.

  • Glow plug relay

  • Glow plug relay circuit

  • ECM

  • Glow plug

 ON ON
P1352 Glow plug relay commanded and glow off for 5 sec. or more.

  • Glow plug relay

  • Glow plug relay circuit

  • ECM

  • Glow plug

 ON ON

FAIL-SAFE

DTC No. Fail-safe Operation Fail-safe Deactivation Condition
P1349 - -
P1350 - -
P1351 - -
P1352 - -

WIRING DIAGRAM

A0136HFE01

INSPECTION PROCEDURE

Tech Tips


  • When DTC P1349, P1350, P1351 or P1352 is detected, check the order of the glow plug relay by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Glw Plg Rly.

    Result:
    Display (DTC output) Condition
    Active Before ECM setting time with the cold engine.
    Inactive After ECM setting time with cold engine.

    *1: This setting time depends on the engine coolant temperature.

  • If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.

  • Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE


  1. INSPECT GLOW PLUG RELAY (VOLTAGE)


    1. A0137X1E01

      Disconnect the B52 glow plug relay connector.

    2. Turn the ignition switch ON.

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

      Standard voltage
      Tester Connection Specified Condition
      4 - 5 11 to 14 V

    NG

    CHECK AND REPLACE HARNESS AND CONNECTOR (BATTERY - GLOW PLUG RELAY, GLOW PLUG RELAY - BODY GROUND)

    OK

  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (GLOW PLUG)


    1. Disconnect the N6, N7, N8 and N9 glow plug connectors.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch ON and turn the intelligent tester on.

    4. Clear the DTC Click here.

    5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Glow Plug Heater Relay.

    6. Perform the active test according to the value(s) in the table below.

      Standard
      Glow plug relay active test Tester Connection Specified Condition
      Active test performed Glow plug (No.1) (N6-1) - Body ground 0 to 12 V
      Active test not performed Glow plug (No.1) (N6-1) - Body ground 0 V

      Tech Tips

      While performing the active test, the operating sound of the glow plug relay is heard.


    NG

    INSPECT GLOW PLUG (INSTALLATION) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  3. INSPECT GLOW PLUG (INSTALLATION)


    1. Check that the glow plug and glow plug wire are securely installed.

      OK
      The glow plug and glow plug wire are securely installed.

    NG

    TIGHTEN GLOW PLUG

    OK

  4. INSPECT GLOW PLUG


    1. A0138WF

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

      Standard resistance
      10 Ω or less

      Tech Tips

      The higher the temperature is the smaller the resistance becomes and vice versa.


    NG

    REPLACE GLOW PLUG

    OK

  5. CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY - ECM)


    1. A01382BE01

      Disconnect the B53 ECM connector.

    2. Disconnect the B52 glow plug relay connector.

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

      Standard resistance
      Check for open
      Tester Connection Specified Condition
      DIAG (B53-16) - Glow plug relay (B52-3) Below 1 Ω
      COM (B53-33) - Glow plug relay (B52-8) Below 1 Ω
      Check for short
      Tester Connection Specified Condition
      DIAG (B53-16) or Glow plug relay (B52-3) - Body ground 10 kΩ or higher
      COM (B53-33) or Glow plug relay (B52-8) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE GLOW PLUG RELAY


    NEXT

  7. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (GLOW PLUG)


    1. Disconnect the N6, N7, N8 and N9 glow plug connectors.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch ON and turn the intelligent tester on.

    4. Clear the DTC Click here.

    5. Select the following menu items: Powertrain / Engine and ECT / Active Test / Glow Plug Heater Relay.

    6. Perform the active test according to the value(s) in the table below.

      Standard
      Glow plug relay active test Tester Connection Specified Condition
      Active test performed Glow plug (No.1) (N6-1) - Body ground 0 to 12 V
      Active test not performed Glow plug (No.1) (N6-1) - Body ground 0 V

    NG

    REPLACE ECM

    OK

    END