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Home >> Suzuki >> 2000 >> Grand Vitara JLX, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Turn ignition off. Disconnect ECT sensor harness connector. Turn ignition on. Using DVOM, measure voltage at ECT sensor harness connector terminal No. 1 (Orange/Black wire). If 4.5-5.5 volts exists, go to next step. If 4.5-5.5 volts does not exist, check Orange/Black wire for open or short to power. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If wire is okay, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
  2. Turn ignition off. Connect a fused jumper wire between ECT sensor harness connector terminals No. 1 (Orange/Black wire) and No. 3 (Gray/Yellow wire). Turn ignition on. Using DVOM, measure voltage between ground and ECT sensor harness connector terminal No. 1 (Orange/Black wire). If less than .15 volt exists, go to next step. If .15 volt or more exists, check Gray/Yellow wires for open or poor connection between ECT sensor harness connector terminal No. 3 and PCM 26-pin connector "B" terminals No. 20 and 21. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary. If wiring and connections are okay, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
  3. Test ECT sensor. See SYSTEM & COMPONENT TESTING article. Replace ECT sensor if resistance is not as specified. See REMOVAL, OVERHAUL & INSTALLATION article. If ECT sensor tests okay, check for poor connection to ECT sensor. If connection is okay, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
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