Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
NOTE:
After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all electronic engine control systems are working properly and DTCs are no longer present.
An IAT signal that is detected out of range high or low by PCM will cause engine to ignore IAT signal, disable exhaust backpressure operation and assume an ambient temperature of 59°F (15°C). This test is intended to diagnose the following components and circuits:
- Intake Air Temperature (IAT) Sensor
- Wiring Harness Circuits; (IAT & SIG RTN)
- Powertrain Control Module (PCM)
IAT SENSOR SPECIFICATIONS
| Temperature - °F (°C) | Resistance - k/Ohms | Volts |
|---|---|---|
| 248 (120) | 1.19 | .28 |
| 230 (110) | 1.56 | .36 |
| 212 (100) | 2.08 | .47 |
| 194 (90) | 2.80 | .61 |
| 176 (80) | 3.84 | .80 |
| 158 (70) | 5.34 | 1.04 |
| 140 (60) | 7.55 | 1.34 |
| 122 (50) | 10.93 | 1.72 |
| 104 (40) | 16.11 | 2.15 |
| 86 (30) | 24.25 | 2.63 |
| 68 (20) | 37.34 | 3.09 |
| 50 (10) | 58.99 | 3.52 |