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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0016 To DTC P0341) >> DTC P0182 or P0183 >> Circuit/System Testing

Circuit/System Testing

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P0182

  1. Turn OFF the ignition for 30 seconds or until the ECM powers down.
  2. Disconnect the fuel temperature sensor.
  3. Turn ON the ignition, with the engine OFF and observe the fuel temperature sensor parameter with a scan tool. Fuel temperature should go to -40°C (-40°F).
    • If the fuel temperature is warmer than -40°C(-40°F), test the signal circuit for a short to ground, a short to any low reference circuits. If the circuits test normal, replace the control module.
  4. If all circuits test normal, replace the fuel temperature sensor.

P0183

  1. Turn ON the ignition, with the engine OFF and observe the fuel temperature sensor parameter with a scan tool.
    • If the fuel temperature is colder than -30°C (-22°F), test the low reference circuit for an open. If the circuits test normal, replace the control module.
  2. Disconnect the fuel temperature sensor connector.
    3. IMPORTANT: If a short to voltage is found, the fuel temperature sensor will also need to be replacement.
  3. Using a DMM, measure the voltage between the fuel temperature signal circuit and a ground.
    • If the voltage measures more than 5.2 volts, test the signal circuit for a short to voltage. If the circuits test normal, replace the control module.
  4. Connect a 3A fused jumper between the signal circuit of the fuel temperature sensor and the low reference circuit.
  5. Observe the fuel temperature sensor parameter with a scan tool.
    • If temperature is colder than 120°C (248°F), test the signal circuit for an open, high resistance or a faulty ECM.
  6. With the ignition still turned ON, connect a DMM between the signal circuit and a ground.
  7. With the DMM set to the mA scale, measure the current.
    • If the current measures more than 15 mA, test the signal circuit for a short to a 5-volt reference circuit. If the circuits test normal, replace the control module.
  8. If all circuits test normal, replace the fuel temperature sensor.
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