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Home >> Toyota >> 2004 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Diagnostics >> Circuit Inspection >> ECM Power Source Circuit >> Inspection Procedure
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Inspection Procedure

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

    PREPARATION: 

    1. Remove the glove compartment (see COMPONENTS ).
    2. Turn the ignition switch ON.

    CHECK: 

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

    OK: 

    Voltage: 9 to 14V 

    Fig 1: Checking Voltage Between Terminals +B (+) And E1 (-)
    G02912618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Proceed to next circuit inspection shown on problem symptoms table (see  PROBLEM SYMPTOMS TABLE  ).  
    2. NG : Go to next step. 
  2. Check for open in wire harness between terminal E1 of ECM connector and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  in INTRODUCTION article).  
    1. NG : Repair or replace harness and connector. 
    2. OK : Go to next step. 
  3. Check voltage between terminal IGSW of ECM connector and body ground. 

    PREPARATION: 

    1. Remove the glove compartment (see COMPONENTS ).
    2. Turn the ignition switch ON.

    CHECK: 

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

    OK: 

    Voltage: 9 to 14V 

    Fig 2: Checking Voltage Between body Ground And Terminal Locating IGSW (+)
    G02912619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Go to step   6 . 
    2. NG : Go to next step. 
  4. Check IGN fuse. 

    PREPARATION: 

    Remove the IGN fuse from the engine room J/B.

    CHECK: 

    Check the resistance of the IGN fuse.

    OK: 

    Resistance: Below 1 Ω 

    Fig 3: Locating IGN Fuse
    G02912620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace IGN fuse. 
    2. OK : Go to next step. 
  5. Check ignition switch (see  INSPECTION  in IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM ARTICLE).  
    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. 

    PREPARATION: 

    1. Remove the glove compartment (see COMPONENTS ).
    2. Turn the ignition switch ON.

    CHECK: 

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

    OK: 

    Voltage: 9 to 14V 

    Fig 4: Checking Voltage Between Body Ground And Terminal MREL (+)
    G02912621Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace ECM (see  COMPONENTS  ).  
    2. OK : Go to next step. 
  7. Check EFI1 fuse. 

    PREPARATION: 

    Remove the EFI1 fuse from the engine room J/B.

    CHECK: 

    Check the resistance of the EFI1 fuse.

    OK: 

    Resistance: Below 1 Ω 

    Fig 5: Locating EFI1 Fuse
    G02912622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace EFI1 fuse. 
    2. OK : Go to next step. 
  8. Check EFI main relay. 

    PREPARATION: 

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

    CHECK: 

    Inspect the EFI main relay.

    OK: 

    EFI RELAY

    Tester Connection Specified Condition
    3 - 5 10 kΩ or higher
    3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    Fig 6: Identifying EFI Main Relay
    G02912623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace EFI main relay. 
    2. OK : Go to next step. 
  9. Check for open and short in wire harness between terminal MREL of ECM and body ground (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  in INTRODUCTION article).  
    1. NG : Repair or replace harness and connector. 
    2. OK : Check and repair harness and connector between EFI1 fuse and battery. 
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