Pinpoint Test DA: Intake Air Temperature (IAT) Sensor: Introduction
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2010 Mercury Milan, 2010 Mercury Mariner, 2010 Mercury Grand Marquis, 2010 Lincoln Town Car, and 2010 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
This pinpoint test is intended to diagnose the following:
- IAT sensor (12A697)
- 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 PIN REFERENCE CHART
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Crown Victoria, Grand Marquis, Town Car |
170 Pin | T41 E22 |
SIGRTN IAT |
| E-Series 6.8L, Explorer, Explorer SportTrac, F-Series Super Duty, Mountaineer, Mustang, Ranger |
170 Pin | E58 E22 |
SIGRTN IAT |
| Edge, Flex 4V 3.5L, MKS 3.7L, MKT 3.7L, MKX, Taurus 4V 3.5L |
190-Pin | B58 B43 |
SIGRTN IAT |
| Escape/Mariner, Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L, Taurus GTDI 3.5L |
190-Pin | B56 B47 |
SIGRTN IAT |
| Fusion 3.5L, MKZ |
140 Pin | B58 B43 |
SIGRTN IAT |
| All other vehicles | 190-Pin | B58 B47 |
SIGRTN IAT |