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Home >> Pontiac >> 2008 >> Grand Prix GXP >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls And Fuel - 3.8L - DTC P0016 To DTC P0350) >> DTC P0117, P0118, P1114, or P1115 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
  • If DTCs P0117 and P0118 are both set, diagnose DTC P0118 first.
  • The cooling fans are commanded ON when certain DTCs are set.
  • If a short to voltage occurs, the ECT sensor may be damaged.

P0117

  1. Ignition ON, engine OFF, disconnect the ECT sensor and observe the ECT parameter for -38°C (-36°F).

P0118

  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.

P1114 or P1115

  1. Observe the engine coolant temperature (ECT) sensor parameter on the scan tool, while moving the ECT sensor connector and the control module connector. Is there an abrupt change indicated on the scan tool?
    • If change, then repair the connector or terminal as necessary.
    • If no change, observe the engine coolant temperature (ECT) sensor parameter on the scan tool, while moving the wiring harness at the ECT sensor and the control module. If there is a change on the scan tool, then repair the wiring as necessary.
  2. If everything checks out, then refer to Testing for Intermittent Conditions and Poor Connections .
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