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Home >> Chevrolet >> 2006 >> Uplander Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.5L - DTC P0016 To DTC P0206 >> DTC P0112, P0113, P1111 or P1112 >> Circuit/System Testing

Circuit/System Testing

P0112 or P1112

  1. Observe the IAT sensor with a scan tool for 130°C (266°F).
  2. Disconnect the MAF/IAT sensor. Observe the IAT sensor with a scan tool for -36°C (-33°F).
    • If more than specified temperature, then test the signal circuit of the IAT sensor for a short to ground or a short to the IAT low reference circuit and repair as necessary. Test for an intermittent and for a poor connection at the control module. If all circuits test OK then replace the control module.
    • If less than specified temperature, then test for an intermittent and for a poor connection at the IAT sensor. If circuit tests OK then replace the MAF/IAT sensor.
IMPORTANT: The sensor may be damaged if the circuit is shorted to a voltage source.

P0113 or P1111

  1. Turn ON the ignition, with the engine OFF. Disconnect the MAF/IAT sensor. Connect a DMM between the signal circuit of the IAT sensor and a good ground. Measure for 5.2 volts.
    • If more than 5.2 volts, then test the signal circuit for a short to voltage.
  2. Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and the low reference circuit of the IAT sensor. Observe the IAT sensor parameter with a scan tool for 130°C (266°F).
    • If more than 130°C (266°F), then test the IAT signal circuit for a short to any 5-volt reference circuit or for an intermittent and for a poor connection at the IAT sensor. If circuits test OK, then replace the MAF/IAT sensor.
  3. Connect a 3-amp fused jumper wire between the signal circuit of the IAT sensor and a good ground. Observe the IAT sensor parameter with a scan tool for 130°C (266°F).
    • If more than 130°C (266°F), then test the IAT sensor low reference circuit for high resistance or for an open. Test for an intermittent and for a poor connection at the control module. If circuits test OK, then replace the control module.
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