DTC P0112-A: INTAKE AIR TEMPERATURE SENSOR VOLTAGE LOW Chrysler LHS II

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

Note. Vehicles equipped with a 3.2L or 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as IAT sensor.

1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If voltage is.5 volt or more, go to next step. If voltage is less than.5 volt, go to step 5.
2. Observe Intake Air Temperature (IAT) sensor voltage on scan tool. Wiggle wiring harness between IAT sensor and PCM. (Scheme 52)and see scheme 46. If voltage changes, repair wiring harness as necessary where wiggling caused problem to appear. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000). If voltage did not change, go to next step.
3. Condition to set trouble code is not present at this time. INTAKE AIR TEMP SENSOR VOLTAGE LOW DTC sets if IAT sensor circuit voltage on Powertrain Control Module (PCM) connector terminal No. 37 goes less than.5 volt. Possible causes are: IAT sensor signal circuit shorted to ground, IAT sensor internally shorted, PCM failure, faulty connections or wiring. Go to next step.
4. Inspect all related wiring and connectors and repair as necessary. Using scan tool, read FREEZE FRAME data. Ensure hex code matches DTC on scan tool. Hex code should be 39. Use this information for additional diagnostics. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(ref-576-S27765318282000030800000) under SELF-DIAGNOSTICS. Test is complete. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000). If related wiring and connectors were repaired, perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000).
5. Disconnect IAT sensor connector. (Scheme 52)and see scheme 46. Using scan tool, read IAT sensor voltage. If voltage is 4 volts or less, go to next step. If voltage is more than 4 volts, replace IAT sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000).
6. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance between IAT sensor signal circuit and IAT sensor ground circuit on IAT sensor connector. See «IAT SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S22204445852000030800000) table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair IAT sensor signal circuit for a short to IAT sensor ground circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000).
7. Using an ohmmeter, check resistance of IAT sensor signal circuit between IAT sensor connector and ground. See «IAT SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S22204445852000030800000) table. If resistance is less than 5 ohms, repair short to ground on IAT sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000). If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000).

IAT SENSOR CONNECTOR WIRE IDENTIFICATION

Scheme 52