1999 Jeep Cherokee Limited
1999 ENGINE PERFORMANCE' 'Self-Diagnostics - Cherokee
DTC P0118: ECT SENSOR VOLTAGE TOO HIGH
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see CHEROKEE wiring diagram in WIRING DIAGRAMS article.
NOTE: P0118: ECT SENSOR VOLTAGE TOO HIGH 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 more than 4.98 volts 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 more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 6).
2. Turn ignition off. Disconnect ECT sensor connector. Clean and/or repair connector as necessary. Connect a jumper wire between ground and ECT sensor connector, sensor ground circuit (Brown/Yellow wire). Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, repair open sensor ground circuit. Perform TEST VER-5A. If voltage is one volt or more, go to next step. Download File PDF
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