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 P1111
| 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 P0113 set? |
- | Go to DTC P0113 | 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 8 | Go to Step 4 |
| 4 | Test the IAT signal circuit between the IAT sensor and the PCM for an intermittent open. Refer to Inducing Intermittent Fault Conditions
, Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 5 |
| 5 | Test the IAT signal circuit between the IAT sensor and the PCM for an intermittent short to voltage. Refer to Inducing Intermittent Fault Conditions
, Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 6 |
| 6 | Test the low reference circuit for an intermittent open. Refer to Inducing Intermittent Fault Conditions
, Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 7 |
| 7 | Test for an intermittent and for a poor connection at the PCM. 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 8 | Go to Diagnostic Aids |
| 8 |
|
- | Go to Step 2 | Go to Step 9 |
| 9 | 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 |