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Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for DTCs P0117, P0118 and P0335. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTCs are not set, go to next step. If any DTC is set, go to that test first.
  2. Perform DTC CONFIRMATION TEST  . If DTC P0125 is set, go to next step. If DTC P0125 is not set, problem is intermittent. System is okay at this time. See INTERMITTENTS TROUBLE SHOOTING - NO CODES article.
  3. Turn ignition off. Connect scan tool. Start engine and allow it to reach normal operating temperature. If ECT reading is less than 88°F (31°C), go to next step. If ECT reading is 88°F (31°C) or more, go to step  7 .
  4. Turn ignition off. Disconnect ECT sensor connector. 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. If ECT reading is 401°F (205°C), go to step  6 . If ECT reading is not 401°F (205°C), go to next step.
  5. Check for short or open in Orange/Black wire between ECT sensor and ECM (PCM) 26-pin connector C51-3 terminals No. 22. Also check for short or open in Gray/Yellow wire between ECT sensor ECM (PCM) 26-pin connector C51-3 terminals No. 20. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary and go to DTC CONFIRMATION TEST  . If wires are okay, replace ECM (PCM) and go to DTC CONFIRMATION TEST  .
  6. Check ECT sensor operation. See ENGINE COOLANT TEMPERATURE SENSOR in SYSTEM & COMPONENT TESTING article. Replace as necessary and go to DTC CONFIRMATION TEST  . If ECT sensor is okay, go to next step.
  7. Check thermostat operation. If heater takes a long time to become effective, or coolant flows into radiator on cold start, remove thermostat for inspection. Replace as necessary and go to DTC CONFIRMATION TEST  . If thermostat operates properly, replace ECM (PCM) and go to DTC CONFIRMATION TEST  .
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