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Home >> Suzuki >> 2007 >> Aerio Base, FWD, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0118: Engine Coolant Temperature Circuit High Input >> DTC Troubleshooting

DTC Troubleshooting

NOTE: 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 -40°C (-40°F) indicated? 		 Go to Step 3. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
3  Check ECT voltage 
  1. Disconnect connector from ECT sensor with ignition switch turned OFF.
  2. Check for proper connection to ECT sensor connector 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.
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Is voltage about 4 - 6 V? 		 Go to Step 6. Go to Step 4.
4  Check ECM voltage 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Remove ECM from vehicle body and connect connectors to ECM.
  3. Check for proper connection of ECM connector at "C46-12" terminal.
  4. If OK, then turn ON ignition switch, check voltage between "C46-12" terminal of ECM connector and vehicle body ground.

Is voltage about 4 - 6 V? 		 Open wire in "LT GRN" circuit.
If wire and connection are OK, go to Step 5.		 Go to Step 5.
5  Check ECT sensor short circuit 
  1. Disconnect connectors from ECM with ignition switch turned OFF.
  2. Turn ON ignition switch.
  3. 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 wire circuit 
  1. Measure resistance between "C46-12" terminal of ECM connector and "LT GRN" wire terminal of ECT sensor connector with ignition switch turn OFF.

Is resistance below 5 ohm? 		 Go to Step 7. High resistance wire in "LT GRN" circuit.
7  Check ECT sensor ground circuit 
  1. Connect connectors to ECM.
  2. Check for proper connection of ECT sensor connector at "ORN" wire terminal.
  3. Measure resistance between "ORN" wire terminal of ECT sensor connector and vehicle body ground.

Is resistance below 10 ohm? 		 Go to Step 9. Go to Step 8.
8  Check ECT sensor ground circuit 
  1. Measure resistance between "C46-16" terminal of ECM connector and vehicle body ground.

Is resistance below 5 ohm? 		 Open or high resistance wire in "ORN" circuit.
Poor "C46-16" connection.		 Open or high resistance wire in "C45-6" and/or "C46-6" circuit.
If circuit are OK, substitute a known-good ECM and recheck.
9  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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