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Home >> Toyota >> 2011 >> Camry Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 156 (Engine Control (SFI) System (2GR-FE) (Diagnostic Codes (P0443-U0101) & Circuit Tests) (Except Hybrid)) >> SFI System >> ECM Power Source Circuit >> Procedure

ECM Power Source Circuit: Procedure

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  1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the ECM connector.
      Fig 1: Identifying C55 ECM Connector Terminal E1
      GTY192690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Condition Specified Condition
      C55-81 (E1) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK ENGINE ROOM JUNCTION BLOCK (EFI RELAY VOLTAGE) 
    1. Remove the engine room junction block from the engine room R/B.
      Fig 2: Identifying Engine Room Junction Block From Engine Room R/B
      GTY147173Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminals.

      Standard voltage

      Tester Connection Condition Specified Condition
      1E-6 - Body ground Ignition switch ON 11 to 14 V

      Result

      Result Proceed to
      NG A
      OK B

    B → See step   4 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY) 
    1. Disconnect the negative battery terminal.
      Fig 3: Identifying Engine Room Relay Block
      GTY147274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the positive battery terminal.
    3. Remove the engine room junction block from the engine room R/B.
    4. Measure the resistance between the terminals.

      Standard resistance (Check for open)

      Tester Connection Condition Specified Condition
      1G-1 - Positive battery terminal Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      1G-1 or Positive battery terminal - Body ground Always 10 kΩ or higher
    5. Reinstall the engine room junction block.
    6. Reconnect the positive battery terminal.
    7. Reconnect the negative battery terminal.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   12 

  4. INSPECT ENGINE ROOM JUNCTION BLOCK (EFI RELAY) 
    1. Remove the engine room junction block from the engine room R/B.
      Fig 4: Identifying Engine Room Junction Block & Engine Room Relay Block
      GTY147271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Condition Specified Condition
      1E-6 - 1E-12 Always 10 kΩ or higher
      1E-6 - 1E-12 Always Below 1 Ω
      (Apply battery voltage between terminals 1E-9 and 1E-10)
    3. Reinstall the engine room junction block.

    NG → REPLACE ENGINE ROOM JUNCTION BLOCK 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (ECM - ENGINE ROOM JUNCTION BLOCK) 
    1. Disconnect the ECM connector.
      Fig 5: Checking Harness And Connector (ECM - Engine Room Junction Block)
      GTY192771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the engine room junction block from the engine room R/B.
    3. Measure the resistance between the terminals.

      Standard resistance (Check for open)

      Tester Connection Condition Specified Condition
      1E-6 - A55-2 (+B) Always Below 1 Ω
      1E-6 - A55-1 (+B2) Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      1E-6 or A55-2 (+B) - Body ground Always 10 kΩ or higher
      1E-6 or A55-1 (+B2) - Body ground Always 10 kΩ or higher
    4. Reinstall the engine room junction block.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. INSPECT ECM (IGSW VOLTAGE) 
    1. Disconnect the ECM connector.
      Fig 6: Identifying A55 ECM Connector Terminals
      GTY186984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminals.

      Standard voltage

      Tester Connection Condition Specified Condition
      A55-28 (IGSW) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result Proceed to
      NG A
      OK B
    4. Reconnect the ECM connector.

    B → See step   10 

    A: Go to next step 

  7. INSPECT IGNITION RELAY NO. 2 
    1. Remove the IG2 relay from the engine room R/B.
      Fig 7: Identifying Relay Terminals
      GTY102844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Condition Specified Condition
      3 - 5 Always 10 kΩ or higher
      3 - 5 Always Below 1 Ω
      (Apply battery voltage between terminals 1 and 2)
    3. Reinstall the IG2 relay.

    NG → REPLACE IGNITION RELAY NO. 2 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND) 
    1. Remove the IG2 relay from the engine room R/B.
      Fig 8: Identifying IG2 Relay & Engine Room R/B
      GTY126032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Condition Specified Condition
      IG2 relay terminal 2 - Body ground Always Below 1 Ω
    3. Reinstall the IG2 relay.

      Result

      Result Proceed to
      OK (Without smart key system) A
      OK (With smart key system) B
      NG C

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    B → GO TO SMART KEY SYSTEM 

    A: Go to next step 

  9. INSPECT IGNITION SWITCH ASSEMBLY 
    1. Disconnect the ignition switch connector.
      Fig 9: Identifying Ignition Switch Connectors
      GTY189513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Ignition Switch Position Specified Condition
      All terminals LOCK 10 kΩ or higher
      2 - 4 ACC Below 1 Ω
      1 - 2 - 4, 5 - 6 ON
      1 - 3 - 4, 5 - 6 - 7 START
    3. Reconnect the ignition switch connector.

    NG → REPLACE IGNITION SWITCH ASSEMBLY 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY) 

  10. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 
    1. Disconnect the ECM connector.
      Fig 10: Identifying A55 ECM Connector
      GTY169688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals.

      Standard resistance

      Tester Connection Condition Specified Condition
      A55-44 (MREL) - Body ground Always Below 1 Ω
    3. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   11 

  11. REPLACE ECM. Refer to  REMOVAL 
  12. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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