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Home >> Toyota >> 2018 >> Camry LE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Control System (2GR-FKS) - Circuit Tests (2 Of 2) & Symptom Tests (1 Of 2) (Except Hybrid)) >> SFI System >> ECM Power Source Circuit [06/2017 - ] >> Procedure

ECM Power Source Circuit [06/2017 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the ECM connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C96-53 (E1) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE) 
    1. Disconnect the ECM connector.
      GTY751550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A21-4 (IGSW) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  3

  3. INSPECT EFI-MAIN NO. 1 RELAY 
    1. Inspect the EFI-MAIN NO. 1 relay.

      Refer to ON-VEHICLE INSPECTION [06/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE EFI-MAIN NO. 1 RELAY 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM) 
    1. Disconnect the ECM connector.
    2. Remove the EFI-MAIN NO. 1 relay from the engine room relay block and junction block assembly.

      HINT: 

      Remove the EFI-MAIN NO. 2 and EFI-MAIN NO. 3 relays connected between the checked terminals as the coil inside the relay influences the measurement value.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (EFI-MAIN No. 1 relay) - A21-46 (MREL) Always Below 1 Ω
      5 (EFI-MAIN No. 1 relay) - A21-2 (+B) Always Below 1 Ω
      5 (EFI-MAIN No. 1 relay) - A21-3 (+B2) Always Below 1 Ω
      2 (EFI-MAIN No. 1 relay) or A21-46 (MREL) - Body ground and other terminals Always 10 kΩ or higher
      5 (EFI-MAIN No. 1 relay) or A21-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      5 (EFI-MAIN No. 1 relay) or A21-3 (+B2) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY) 
    GTY745159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Engine Room Relay Block and Junction Block Assembly
    *2 EFI-MAIN NO. 1 Relay
    1. Remove the EFI-MAIN NO. 1 relay from the engine room relay block and junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 1 RELAY) 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - BODY GROUND) 
    1. Remove the EFI-MAIN NO. 1 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
      1 (EFI-MAIN NO. 1 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2017 - 08/2018]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT IG2 NO. 1 RELAY 
    1. Inspect the IG2 NO. 1 relay.

      Refer to ON-VEHICLE INSPECTION [06/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE IG2 NO. 1 RELAY 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (IG2 NO. 1 RELAY - ECM) 
    1. Disconnect the ECM connector.
    2. Remove the IG2 NO. 1 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
      3 (IG2 NO. 1 relay) - A21-4 (IGSW) Always Below 1 Ω
      3 (IG2 NO. 1 relay) or A21-4 (IGSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK TERMINAL VOLTAGE (POWER SOURCE OF IG2 NO. 1 RELAY) 
    GTY745658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Engine Room Relay Block and Junction Block Assembly
    *2 IG2 NO. 1 Relay
    1. Remove the IG2 NO. 1 relay from the engine room relay block and junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (IG2 NO. 1 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IG2 NO. 1 RELAY) 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (IG2 NO. 1 RELAY - BODY GROUND) 
    1. Remove the IG2 NO. 1 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
      2 (IG2 NO. 1 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 NO. 1 RELAY) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Remove the IG2 NO. 1 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
      K62-17 (IG1D) - 1 (IG2 NO. 1 relay) Always Below 1 Ω
      K62-17 (IG1D) or 1 (IG2 NO. 1 relay) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK SMART KEY SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 08/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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