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Home >> Toyota >> 2006 >> Tundra Base, 4.0 U, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine (1GR-FE) - Diagnostics >> Circuit Inspection >> ECM Power Source Circuit >> Inspection Procedure

Inspection Procedure

  1. Check voltage between terminals +B and E1 of ECM connector. 
    Fig 1: Identifying E5 And E3 ECM Connector
    G02648151Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Turn the ignition switch to ON.

    CHECK: 

    Measure the voltage between terminals +B and E1 of the ECM connectors.

    OK: 

    1. Standard: 9 to 14 V 
    1. OK: Proceed to next circuit inspection shown in the  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 (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Go To Next Step. 
  3. Check voltage between terminal IGSW of ECM connector and body ground. 
    Fig 2: Identifying E3 ECM Connector
    G02648152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Turn the ignition switch to ON.

    CHECK: 

    Measure the voltage between terminal IGSW of the ECM connector and body ground.

    OK: 

    1. Standard: 9 to 14 V 
    1. OK: Go to Step   6 . 
    2. NG: Go To Next Step. 
  4. Check IGN fuse. 
    Fig 3: Removing IGN Fuse From Instrument Panel J/B
    G02648153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Remove the IGN fuse from the instrument panel J/B.

    CHECK: 

    Check the resistance of the IGN fuse.

    OK: 

    1. Below 1 Ω 
    1. NG: Check for short in all harness and components connected to IGN fuse, and replace the fuse. 
    2. OK: Go To Next Step. 
  5. Check ignition switch (See  INSPECTION  ). 
    1. NG: Replace ignition switch. 
    2. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM. 
  6. Check voltage between terminal MREL of ECM connector and body ground. 
    Fig 4: Identifying E3 ECM Connector
    G02648154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Turn the ignition switch to ON.

    CHECK: 

    Measure the voltage between terminal MREL of the ECM connector and body ground.

    OK: 

    1. Standard: 9 to 14 V 
    1. NG: Replace  ENGINE CONTROL MODULE (ECM)  . 
    2. OK: Go To Next Step. 
  7. Check EFI No. 1 fuse of engine room J/B. 
    Fig 5: Removing EFI No 1 Fuse From Engine Room J/B
    G02648155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

    Remove the EFI No. 1 fuse from the engine room J/B.

    CHECK: 

    Check resistance of EFI No. 1 fuse.

    OK: 

    1. Below 1 Ω 
    1. NG: Check for short in all harness and components connected to EFI No. 1 fuse, and replace the fuse. 
    2. OK: Go To Next Step. 
  8. Check EFI relay). 
    Fig 6: Identifying EFI Relay
    G02648156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    PREPARATION: 

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

    CHECK: 

    Inspect the EFI relay.

    OK: 

    1. Standard: 
    TERMINAL SPECIFIED CONDITION

    Terminal No. Condition Specified Condition
    3-5 Always 10 KΩ or higher
    3-5 Apply B+ between terminals 1 and 2 Below 1 Ω
    1. NG: Replace EFI relay. 
    2. OK: Go To Next Step. 
  9. Check for open and short in harness and connector between terminal MREL of ECM and body ground (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG: Repair or replace harness or connector. 
    2. OK: Check and repair harness or connector between EFI No. 1 fuse and battery. 
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