DTC P0117-A: ECT TEMPERATURE SENSOR VOLTAGE TOO LOW Chrysler LHS II

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

1. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) 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. While monitoring scan tool display, wiggle ECT sensor wiring harness. If voltage changes when wiggling ECT sensor harness, 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 when wiggling ECT sensor harness, go to next step.
3. Condition to set trouble code is not present at this time. ECT SENSOR VOLTAGE TOO LOW DTC sets if Powertrain Control Module (PCM) terminal No. 26 is less than .5 volt for more than 3 seconds. Possible causes are: ECT sensor signal circuit shorted to ground, ECT sensor shorted internally, 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 1F. 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. Turn ignition off. Disconnect ECT sensor connector. Turn ignition on. Using scan tool, read ECT sensor voltage. If voltage is 4 volts or less, go to next step. If voltage is more than 4 volts, replace ECT 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 of ECT sensor connector signal circuit between ECT sensor connector and ground. See «ECT SENSOR WIRE IDENTIFICATION»(ref-576-S35449216542000030800000) table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on ECT sensor signal circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S36272092702000030800000) .
7. Using an ohmmeter, check resistance between ECT sensor signal circuit and ECT sensor ground circuit at ECT sensor connector. See «ECT SENSOR WIRE IDENTIFICATION»(ref-576-S35449216542000030800000) table. If resistance is less than 5 ohms, repair ECT sensor signal circuit for a short to ECT sensor ground 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) .

ECT SENSOR WIRE IDENTIFICATION