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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Engine Control System & Fuel System - 3.8L - DTC P0016 To DTC P0350) >> DTC P0117, P0118, P1114, or P1115 >> Circuit/System Testing >> P0118

Circuit/System Testing: P0118

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition ON, engine OFF, disconnect the ECT sensor and measure for 5.2 volts from the signal circuit of the ECT sensor to a good round with a DMM.
    • If over 5.2 volts, then test the ECT signal circuit for a short to voltage, an intermittent and for a poor connection at the control module. If all test OK, then replace the control module.
    • If under 4.8 volts, then test the signal circuit of the ECT sensor for high resistance, an open, or a short to any 5-volt reference circuit. If tests OK, then replace the ECT sensor.
  2. With the ignition ON, engine OFF
  3. Connect a 3A jumper wire between the signal circuit of the ECT sensor and the low reference circuit.
  4. Observe the ECT parameter with a scan tool for 139°C (282°F).
    • If more then specified value, then test the ECT signal circuit for a short to any 5-volt reference circuit, faulty connection at control module. If circuits test OK, then replace the ECT sensor.
  5. Connect a 3A jumper wire between the signal circuit of the ECT sensor and a good ground.
  6. Observe the ECT parameter with a scan tool for 139°C (282°F).
    • If more than the specified value, then test the ECT low reference circuit for high resistance or an open. Test for a faulty connection at the control module, or a faulty control module. If the circuit tests OK, then replace the control module.
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