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 .
- If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
DTC P0112
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
149°C (300°F) | Go to Step 4 | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to Diagnostic Aids |
| 4 |
|
-39°C (-39°F) | Go to Step 6 | Go to Step 5 |
| 5 | Test the signal circuit of the IAT sensor for a short to ground or a short to the IAT low reference circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 7 |
| 6 | Replace the IAT sensor. Refer to Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 8 | - |
| 7 | Replace the engine control module (ECM). Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 8 | - |
| 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 - Vehicle | System OK |