LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2005 >> Verona EX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0118 Engine Coolant Temperature (ECT) Sensor High Input >> DTC Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting

DIAGNOSIS PROCEDURE - DTC P0118 ENGINE COOLANT TEMPERATURE (ECT) SENSOR HIGH INPUT

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Install the scan tool to the Data Link Connector (DLC).
  2. Run the engine until it reaches operating temperature.

Does the scan tool show the Engine Coolant Temperature (ECT) sensor reading between the specified values?		 80 ~ 110°C (176 ~ 230 °F) Go to "DIAGNOSTIC AIDS ". Go to Step 3.
3
  1. Turn the ignition switch to LOCK.
  2. Disconnect the ECT sensor connector.
  3. Turn the ignition switch to ON.

Does the scan tool show the Engine Coolant Temperature (ECT) sensor reading below the specified value?		 -30 °C (-22 °F) Go to Step 4. Go to Step 6.
4
  1. Jump connect the ECT sensor connector terminal 1 and 2.
  2. Turn the ignition switch to ON.

Does the scan tool show the ECT sensor reading above the specified value?		 180 °C (356 °F) Go to Step 5. Go to Step 6.
5
  1. Replace the ECT sensor.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
6 Measure the voltage between the ECT sensor connector terminal 1 and the ground.
Is the voltage between the specified values?		 4.5 - 5.5 V Go to Step 7. Go to Step 8.
7
  1. Turn the ignition switch to LOCK.
  2. Disconnect the ECM connector.
  3. Check for a short to ECM reference voltage in the wire between the ECT sensor connector terminal 2 and the ECM connector terminal 71.

Is the problem found?		 - Go to Step 9. Go to Step 8.
8 Check for an open or a short in the wire between the ECT sensor connector terminal 2 and the ECM connector terminal 71.
Is the problem found?		 - Go to Step 10. Go to Step 11.
9
  1. Repair the short to the ECM reference voltage in the wire between the ECT sensor connector terminal 2 and the ECM connector terminal 71.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
10
  1. Repair the open or the short in the wire between the ECT sensor connector terminal 2 and the ECM connector terminal 71.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
11 Check for an open or a short in the wire between the ECT sensor connector terminal 1 and the ECM connector terminal 36.
Is the problem found?		 - Go to Step 12. Go to Step 13.
12
  1. Repair the open or the short in the wire between the ECT sensor connector terminal 1 and the ECM connector terminal 36.
  2. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
13
  1. Turn the ignition switch to LOCK.
  2. Replace the ECM.
  3. Perform an On-Board Diagnostic (OBD) System Check.

Is the repair complete?		 - System OK -
scientia non olet · About LEMON Manuals