1999 Jeep Cherokee Limited
1999 ENGINE PERFORMANCE' 'Self-Diagnostics - Cherokee
DTC P0117: ECT SENSOR VOLTAGE TOO LOW
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see CHEROKEE wiring diagram in WIRING DIAGRAMS article.
NOTE: DTC P0117: ECT SENSOR VOLTAGE TOO LOW is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Engine Coolant Temperature (ECT) sensor voltage is less than .8 volt for more than 3 seconds. Possible causes are: defective ECT sensor, defective PCM, defective connectors or defective wiring.
1. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, go to step 6).
2. Turn ignition off. Disconnect ECT sensor connector. See Fig. 24 . Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-5A. If voltage is 4 volts or less, go to next step. Download File PDF
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