Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
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 |