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Home >> Toyota >> 2004 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Diagnostics >> Circuit Inspection >> Fuel Pump Control Circuit >> Inspection Procedure >> OBD II scan tool (excluding hand-held tester):

OBD II scan tool (excluding hand-held tester):

  1. Check fuel pump operation (see Check fuel pressure (see  ON-VEHICLE INSPECTION  ).  

    CHECK: 

    Check if there is pressure in the fuel inlet hose.

    HINT:

    The pipe has fuel pressure if the sound of flowing fuel can be heard.

    1. NG : Proceed to next circuit inspection shown on problem symptoms table (see  PROBLEM SYMPTOMS TABLE  ).  
    2. OK : Go to next step. 
  2. Check operation circuit opening relay (Marking: C/OPN). 

    PREPARATION: 

    Connect between terminal FC of the ECM connector and the body ground.

    CHECK: 

    Check the relay operation.

    OK: 

    Noise can be heard from the circuit opening relay. 

    Fig 1: Checking Voltage Between Body Ground And Terminal FC (+)
    G02912628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Go to step   6 . 
    2. OK : Go to next step. 
  3. Check circuit opening relay (Marking: C/OPN). 

    PREPARATION: 

    Remove the circuit opening relay from the engine room J/B.

    CHECK: 

    Measure the circuit opening 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 2: Identifying C/OPN Relay
    G02912629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : Replace circuit opening relay. 
    2. OK : Go to next step. 
  4. Check voltage between terminal FC 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 FC of the ECM connector and body ground.

    OK: 

    Voltage: 9 to 14V 

    Fig 3: Checking Voltage Between Body Ground and Terminal FC (+)
    G02912630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Replace ECM (see  COMPONENTS  ).  
    2. NG : Go to next step. 
  5. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump 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. 
  6. Check fuel pump (see Check fuel pressure (see  ON-VEHICLE INSPECTION  ).  
    1. NG : Repair or replace fuel pump. 
    2. OK : Go to next step. 
  7. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump 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 : Replace ECM (see  COMPONENTS  ).  
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