Diagnostic Aids
When engine is allowed to cool to ambient temperature or overnight, CTS and IAT sensor resistance or temperature may be checked with a scan tester. Resistance readings of components should be close to each other.
Code 23 is set if signal wire is shorted to ground. If code is intermittent, see TESTS W/O CODES article in this section.
INTAKE AIR TEMPERATURE SENSOR RESISTANCE
| Temperature: °F (°C) | Resistance: Ohms |
|---|---|
| 210 (100) | 185 |
| 160 (70) | 450 |
| 100 (38) | 1800 |
| 70 (20) | 3400 |
| 40 (4) | 7500 |
| 20 (-7) | 13,500 |
| 0 (-18) | 25,000 |
| -40 (-40) | 100,700 |