Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Ford RV Cutaway, 2002 Ford Pickup, 2002 Ford F550 Super Duty, 2002 Ford F450 Super Duty, and 2002 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
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 |