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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Diesel) >> Fuel Heater Diagnosis
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Fuel Heater Diagnosis

  1. If water in fuel light is operating properly, go to next step. If water in fuel light is not operating properly, perform water in fuel light diagnosis. See WATER-IN-FUEL LIGHT DIAGNOSIS .
  2. Disconnect fuel heater harness connector and remove heater from filter housing. With fuel heater temperature greater than 50°F (10°C), apply battery voltage to fuel heater terminal "C" (Pink wire) and ground fuel heater terminal "A" (Black wire). Observe heater element. If heat does not exist, go to next step. If heat exists, go to step  4.
  3. Cool fuel heater to less than 46°F (8°C) and wet heating element with fuel. Connect fuel heater to battery voltage and ground as in step  2. Observe heater element. If heat does not exist, go to next step. If heat exists, go to step  5.
  4. Replace fuel heater. After repairs, go to next step.
  5. Operate vehicle under conditions when problem was noted. If system does not operate properly, go to step  1.
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