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Home >> Suzuki >> 2007 >> Aerio Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0117: Engine Coolant Temperature Circuit Low Input >> DTC Troubleshooting

DTC Troubleshooting

NOTE:
  • Before inspecting, be sure to check that coolant temp. meter in combination meter indicates normal operating temperature (Engine is not overheating).
  • When this DTC and P1709 are stored together, also clear DTC stored in TCM after completion of repair.
DIAGNOSIS PROCEDURE

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  ECT sensor and its circuit check 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Turn ignition switch to ON position.
  3. Check engine coolant temp. displayed on scan tool.

Is 205°C (401°F) indicated? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3  Check ECM voltage 
  1. Disconnect connector from ECT sensor with ignition switch turned OFF.
  2. Check for proper connection to ECT sensor at "LT GRN" and "ORN" wire terminals.
  3. If OK, then turn ON ignition switch, check voltage between "LT GRN" wire terminal of ECT sensor connector and vehicle body ground.

Is voltage about 4 - 6 V? 		 Go to Step 6. Go to Step 4.
4  Check ECT sensor circuit insulation 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Measure resistance between "LT GRN" wire terminal of ECT sensor connector and body ground.

Is resistance infinity? 		 Go to Step 5. "LT GRN" wire shorted to ground circuit.
If wire are OK, substitute a known-good ECM and recheck.
5  Check ECT sensor short circuit 
  1. Turn ignition switch to ON position.
  2. Check voltage between "LT GRN" wire terminal of ECT sensor connector and vehicle body ground.

Is voltage about 0 V? 		 Go to Step 6. "LT GRN" wire shorted to other circuits.
If wire are OK, substitute a known-good ECM and recheck.
6  Check ECT sensor 
  1. Check ECT sensor according to Engine Coolant Temperature (ECT) Sensor Inspection  .

Is it good condition? 		 Substitute a known-good ECM and recheck. Replace ECT sensor.
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