Pinpoint Test DA: Intake Air Temperature (IAT) Sensor: Introduction
This pinpoint test is intended to diagnose the following:
- integrated mass air flow/intake air temperature (MAF/IAT) sensor (12B579)
- harness circuits: IAT and SIGRTN
- powertrain control module (PCM) (12A650)
Voltage values calculated for VREF equal 5 volts. These values can vary by 15% due to sensor and VREF variations.
TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS
| Temperature | Temperature Sensor Values | ||
|---|---|---|---|
| °C | °F | Voltage | Resistance (K ohms) |
| 120 | 248 | 0.28 | 1.18 |
| 110 | 230 | 0.36 | 1.55 |
| 100 | 212 | 0.47 | 2.07 |
| 90 | 194 | 0.61 | 2.80 |
| 80 | 176 | 0.80 | 3.84 |
| 70 | 158 | 1.05 | 5.37 |
| 60 | 140 | 1.37 | 7.70 |
| 50 | 122 | 1.77 | 10.97 |
| 40 | 104 | 2.23 | 16.15 |
| 30 | 86 | 2.74 | 24.27 |
| 20 | 68 | 3.26 | 37.30 |
| 10 | 50 | 3.73 | 58.75 |
| 0 | 32 | 4.14 | 95.85 |
| -10 | 14 | 4.45 | 160.31 |
For PCM connector views or reference values, refer to REFERENCE VALUES .
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| E-Series 4.6L, E-Series 5.4L, Expedition, F-150, Focus, Navigator |
190-Pin | B58 B47 |
SIGRTN IAT |
| Edge, Flex, MKS, MKX, Sable, Taurus, Taurus X |
190-Pin | B58 B43 |
SIGRTN IAT |
| Escape/Mariner | 190-Pin | B56 B47 |
SIGRTN IAT |
| Fusion, Milan, MKZ |
140 Pin | B58 B43 |
SIGRTN IAT |
| Town Car | 170 Pin | T41 E22 |
SIGRTN IAT |
| All other vehicles | 170 Pin | E58 E22 |
SIGRTN IAT |