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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> Fuel Heater Diagnosis >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition Off.
  2. Disconnect the harness connector at the E11A Fuel Heater/Water in Fuel Sensor.
  3. Connect a test lamp between voltage supply circuit terminal 2 and ground.
  4. Ignition On.
  5. Command the Fuel Heater On and Off with a scan tool. Verify the test lamp turns on and off.
    • If the test lamp is always Off 
    1. Ignition Off.
    2. Remove the KR22 Fuel Heater Relay from X50A Fuse Block-Underhood.
    3. Verify that a test lamp illuminates between the fuel heater relay voltage supply circuit terminal 5 and ground.
      • If the test lamp is always Off
      1. Verify the fuse is good and there is voltage at the fuse.
        • If fuse is open, replace the fuse and repair the short to ground in the circuit.
        • If no voltage is present, repair the open/high resistance in the circuit.
      • If test lamp illuminates
    4. Test for infinite resistance between the fuel heater voltage supply circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω in the fuel heater voltage supply circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the KR22 Fuel Heater Relay.
    • If the test lamp is always On 
    1. Ignition Off.
    2. Remove the KR22 Fuel Heater Relay from X50A Fuse Block-Underhood.
    3. Ignition On.
    4. Test for less then 1 V between the fuel heater voltage supply circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the KR22 Fuel Heater Relay.
    • Go to next step: If the test lamp turns On and Off 
  6. Test for less than 10 Ω between the fuel heater ground circuit terminal 4 and ground.
    • If 10 Ω or greater 

      Repair the open/high resistance in the circuit

    • Go to next step: If less than 10 Ω 
  7. Replace the E11A Fuel Heater/Water in Fuel Sensor.
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