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Home >> Suzuki >> 2005 >> XL-7 EX, 4WD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> H27 Engine >> Diagnostic Information and Procedures >> DTC P0118: Engine Coolant Temperature Circuit High >> DTC Troubleshooting
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DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action Yes No
1 Was "Engine and Emission Control System Check" performed?  Go to Step 2. Go to "ENGINE AND EMISSION CONTROL SYSTEM CHECK  ".
2 Check ECT sensor and its circuit 
  1. Connect scan tool with ignition switch turned OFF.
  2. Turn ON ignition switch.
  3. Check engine coolant temp, displayed on scan tool.

Is -40 °C (-40 °F) indicated? 

 Go to Step 3. Intermittent trouble. Check for intermittent referring to "INTERMITTENT AND POOR CONNECTION INSPECTION ".
3 Check wire harness 
  1. Disconnect ECT sensor connector with ignition switch turned OFF.
  2. Check for proper connection to ECT sensor at "GRN" and "GRY/YEL" wire terminals.

If OK, then with ignition switch turned ON, is voltage applied to "GRN" wire terminal about 4 - 6V? 

 Go to Step 4. Open in "GRN" circuit or shorted to power supply line, or poor "C51 -3-2" terminal connection. If wire and connection are OK, substitute a known-good ECM and recheck.
4 Check wire harness 
  1. Using service wire, connect ECT sensor connector terminals.
  2. Turn ON ignition switch and check engine coolant temp. displayed on scan tool.

Is 164 °C (327 °F) indicated? 

 Replace ECT sensor. Open in "GRY/YEL" circuit or poor "C51-3-23" terminal connection. If wire and connection are OK, substitute a known-good ECM and recheck.
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