Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- An IAT sensor or PCM which is intermittently shorted, open, or skewed is possible, yet very unlikely.
- A skewed sensor could result in poor driveability conditions.
- If an intermittent condition is suspected, refer to Intermittent Conditions .
DTC P1112
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check-Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 | Observe the DTC information with a scan tool. Is DTC P0112 set? |
- | Go to DTC P0112 | Go to Step 3 |
| 3 | Test for an intermittent and for a poor connection at the IAT sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 5 | Go to Step 4 |
| 4 | Test the IAT signal circuit between the IAT sensor and the PCM for an intermittent short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 5 | Go to Diagnostic Aids |
| 5 |
|
- | Go to Step 2 | Go to Step 6 |
| 6 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List | System OK |