Circuit/System Testing

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 or a faulty ECM.
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 or faulty ECM.
2. Disconnect the fuel temperature sensor connector.
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 or a faulty ECM.
4. Connect a 3-amp 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 150°C (302°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 or a faulty ECM.
8. If all circuits test normal, replace the fuel temperature sensor.