P1112 Chevrolet Uplander I

The control module detects that the IAT sensor parameter is more than 130°C (266°F) intermittently for more than 16 seconds.

Action Taken When the DTC Sets

P0112 and P0113

1. The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

P1112 and P1111

1. The control module stores the DTC information into memory when the diagnostic runs and fails.
2. The MIL will not illuminate.
3. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
4. The driver information center (DIC), if equipped, may display a message.

Conditions for Clearing the DTC

P0112 or P0113

1. The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
4. Clear the MIL and the DTC with a scan tool.

P1112 or P1111

1. A current DTC Last Test Failed clears when the diagnostic runs and passes.
2. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
3. Clear the DTC with a scan tool.

Diagnostic Aids

When the vehicle is at ambient temperature, the IAT sensor and the ECT sensor should be relatively close to each other. Refer to Temperature vs Resistance .

Schematic Reference

Engine Controls Schematics (LX9)

Connector End View Reference

1. «Engine Controls Connector End Views»(ref-241686-S08441285052006081100000)
2. «Powertrain Control Module (PCM) Connector End Views»(ref-241686-S19816580672006081100000)