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Home >> Toyota >> 2005 >> ECHO 2D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine - Diagnostics >> Circuit Inspection >> ECM Power Source Circuit >> Inspection Procedure
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Inspection Procedure

  1. Check voltage between terminals +B and E1 of ECM connectors. 

    PREPARATION:

    Turn the ignition switch to ON.

    CHECK:

    Measure the voltage between the specified terminals of the E4 and E7 ECM connectors.

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    +B (E4-1) - E1 (E7-7) 9 to 14 V
    Fig 1: Identifying ECM Connectors Terminals Of E4 And E7
    G02590733Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK Proceed to next circuit inspection shown on  PROBLEM SYMPTOMS TABLE  . 
    2. NG GO TO NEXT STEP 
  2. Check for open in harness and connector between terminal E1 of ECM and body ground. 

    PREPARATION:

    Disconnect the E7 ECM connector.

    CHECK:

    Check the resistance.

    OK:

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    E1 (E7-7) - Body ground Below 1 Ω
    Fig 2: Disconnecting E7 ECM Connector
    G02590734Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  3. Check ignition switch. 

    PREPARATION:

    Disconnect the 110 ignition switch connector.

    CHECK:

    Check the resistance between the connector terminals shown in the chart below.

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION

    Switch Position Tester Connection Specified Condition
    LOCK All Terminals 10 kΩ or higher
    ACC 1-3 Below 1 Ω
    ON 1-2, 1-3, 2-3, 5-6 Below 1 Ω
    START 4-5, 4-6, 5-6, 1-2 Below 1 Ω
    Fig 3: Identifying 110 Ignition Switch Connector Terminals
    G02590735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Replace ignition switch. 
    2. OK GO TO NEXT STEP 
  4. Check EFI fuse. 

    PREPARATION:

    Remove the EFI fuse from the engine room R/B.

    CHECK:

    Check the resistance of the EFI fuse.

    Standard: Below 1 Ω 

    Fig 4: Identifying EFI Fuse Location
    G02590736Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Check for short in all harness and components connected to EFI fuse. 
    2. OK GO TO NEXT STEP 
  5. Check EFI relay (Marking: EFI). 

    PREPARATION:

    Remove the EFI relay from the engine room R/B.

    CHECK:

    Check the EFI relay resistance.

    OK:

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    3-5 10 kΩ higher
    3-5 Below 1 Ω (when battery voltage applied to terminals 1 and 2)
    Fig 5: Identifying EFI Relay Terminals And Circuit
    G02590737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Replace EFI relay. 
    2. OK GO TO NEXT STEP 
  6. Check for open and short in harness and connectors between EFI relay and ECM, EFI relay and body ground. 

    Check the harness and connector between the EFI relay terminal of R/B and ECM connector. 

    PREPARATION:

    1. Remove the EFI relay from the engine room R/B.
    2. Disconnect the E4 ECM connector.

    CHECK:

    Check the resistance.

    OK:

    Fig 6: Identifying EFI Relay Terminals
    G02590738Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B - +B (E4-1) Below 1 Ω

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    EFI relay terminal 3 of R/B or +B (E4-1) - Body ground 10 kΩ or higher

    Check the harness and connector between the EFI relay terminal of R/B and body ground. 

    PREPARATION:

    Remove the EFI relay from the engine room R/B.

    CHECK:

    Check the resistance.

    OK:

    Fig 7: Disconnecting E4 ECM Connector
    G02590739Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    EFI relay terminal 2 of R/B - Body ground Below 1 Ω
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  7. Check AM2 fuse. 

    PREPARATION:

    Remove the AM2 fuse from the engine room R/B.

    CHECK:

    Check the resistance of the AM2 fuse.

    Standard: Below 1 Ω 

    Fig 8: Identifying AM2 Fuse Location
    G02590740Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Check for short in all harnesses and components connected to AM2 fuse. 
    2. OK GO TO NEXT STEP 
  8. Check for open and short in harness and connectors between EFI relay and EFI fuse. 

    PREPARATION:

    1. Remove the EFI relay from the engine room R/B.
    2. Remove the EFI fuse from the engine room R/B.

    CHECK:

    Check the resistance.

    OK:

    Standard (Check for open): 

    Fig 9: Identifying EFI Relay Terminals
    G02590741Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Tester Connection Specified Condition
    EFI relay terminal 5 of R/B - EFI fuse terminal 2 of R/B Below 1 Ω

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Tester Connection Specified Condition
    EFI relay terminal 5 of R/B or EFI fuse terminal 2 of R/B - Body ground 10 kΩ or higher
    Fig 10: Identifying EFI Fuse Terminals
    G02590742Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  9. Check for open and short in harness and connectors between EFI relay and ignition switch. 

    PREPARATION:

    1. Remove the EFI relay from the engine room R/B.
    2. Disconnect the 110 ignition switch connector.

    CHECK:

    Check the resistance.

    OK:

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Symbols (Terminal No.) Specified condition
    IG2 (I10-6) - EFI relay terminal 1 of R/B Below 1 Ω
    Fig 11: Identifying I10 Ignition Switch Connector
    G02590743Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR OPEN)

    Symbols (Terminal No.) Specified condition
    IG2 (I10-6) or EFI relay terminal 1 of R/B - Body ground 10 kΩ or higher
    Fig 12: Identifying EFI Relay Terminals
    G02590744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK GO TO NEXT STEP 
  10. Check for open and short in harness and connectors between ignition switch and AM2 fuse. 

    PREPARATION:

    1. Disconnect the 110 ignition switch connector.
    2. Remove the AM2 fuse from the engine room R/B.

    CHECK:

    Check the resistance.

    OK:

    Fig 13: Identifying I10 Ignition Switch Connector
    G02590745Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard (Check for open): 

    TESTER CONNECTION AND SPECIFIED CONDITION (CHECK FOR SHORT)

    Symbols (Terminal No.) Specified condition
    AM2 (I10-5) - AM2 fuse terminal 2 of R/B Below 1 Ω

    Standard (Check for short): 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Symbols (Terminal No.) Specified condition
    AM2 (I10-5) - AM2 fuse terminal 2 of R/B - Body ground 10 kΩ or higher
    Fig 14: Identifying EFI Fuse Terminals
    G02590746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG Repair or replace harness or connector. 
    2. OK Check and repair harness and connector between AM2 fuse and battery positive terminal, EFI fuse and buttery positive terminal. 
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