Code p0118.. HELP!!!
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Honda-Tech Member
Joined: Jul 2006
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From: dallas, tx, us
Code p0118.. HELP!!!
Car just recently started to run like **** last month havent driven it since.
P0118 - Engine Coolant Temperature (ECT) sensor circuit high input.
car feels like running low on power, rough idle, hard to start & temp gauge doesnt work.
anybody run into this problem?
P0118 - Engine Coolant Temperature (ECT) sensor circuit high input.
car feels like running low on power, rough idle, hard to start & temp gauge doesnt work.
anybody run into this problem?
B*a*n*n*e*d
Joined: Sep 2007
Posts: 7,457
Likes: 15
Re: Code p0118.. HELP!!!
... in a nutshell ...
P0118 - ECT Sensor Circuit High Voltage
1. Turn the ignition switch On. (II)
2. Check the ECT with a scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Go to step 3.
No - It was an intermittent failure. Check for loose or poor connections at the ECT sensor and at the ECU.
3. Turn the ignition switch Off.
4. Disconnect the ECT 2-pin connector.
5. Connect terminals 1 (green/yellow wire) and 2 (red/white wire) with a jumper wire.
6. Turn the ignition switch back ON. (II)
7. Recheck the ECT with the scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Go to step 8.
No - Replace the ECT sensor.
8. Turn the ignition switch Off.
9. Remove the jumper wire.
10. Turn the ignition switch back On. (II)
11. Measure the voltage between terminal 2 (red/white wire) of the ECT sensor connector and a ground.
Is there about 5 volts?
Yes - Go to step 12.
No - Go to step 16.
12. Turn the ignition switch Off.
13. Disconnect ECU connector A. (31-pin connector)
14. Connect terminal 1 (green/yellow wire) of the ECT sensor connector to a body ground using a jumper wire.
15. Check for continuity between terminal 10 (green/yellow wire) of ECU connector A and a body ground.
Is there continuity?
Yes - Update the ECU software if it doesn't have the latest. (rarely the case) Or swap your ECU with one that is known to be good and recheck. If the problem goes away when using the sub-ECU, keep it.
No - There's an open in the wire between the ECU (A10) and the sensor. You'll need to find and repair it.
16. Connect ECU connector terminals A10 (green/yellow wire) and B8 (red/white wire) with a jumper wire.
17. Turn the ignition switch On. (II)
18. Check the ECT with a scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Update the ECU software if it doesn't have the latest. (rarely the case) Or swap your ECU with one that is known to be good and recheck. If the problem goes away when using the sub-ECU, keep it.
No - There's an open in the wire between the ECU (B8) and the ECT sensor. Find it and repair it.
Good luck with it.
P0118 - ECT Sensor Circuit High Voltage
1. Turn the ignition switch On. (II)
2. Check the ECT with a scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Go to step 3.
No - It was an intermittent failure. Check for loose or poor connections at the ECT sensor and at the ECU.
3. Turn the ignition switch Off.
4. Disconnect the ECT 2-pin connector.
5. Connect terminals 1 (green/yellow wire) and 2 (red/white wire) with a jumper wire.
6. Turn the ignition switch back ON. (II)
7. Recheck the ECT with the scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Go to step 8.
No - Replace the ECT sensor.
8. Turn the ignition switch Off.
9. Remove the jumper wire.
10. Turn the ignition switch back On. (II)
11. Measure the voltage between terminal 2 (red/white wire) of the ECT sensor connector and a ground.
Is there about 5 volts?
Yes - Go to step 12.
No - Go to step 16.
12. Turn the ignition switch Off.
13. Disconnect ECU connector A. (31-pin connector)
14. Connect terminal 1 (green/yellow wire) of the ECT sensor connector to a body ground using a jumper wire.
15. Check for continuity between terminal 10 (green/yellow wire) of ECU connector A and a body ground.
Is there continuity?
Yes - Update the ECU software if it doesn't have the latest. (rarely the case) Or swap your ECU with one that is known to be good and recheck. If the problem goes away when using the sub-ECU, keep it.
No - There's an open in the wire between the ECU (A10) and the sensor. You'll need to find and repair it.
16. Connect ECU connector terminals A10 (green/yellow wire) and B8 (red/white wire) with a jumper wire.
17. Turn the ignition switch On. (II)
18. Check the ECT with a scanner.
Is - 4 °F (-20 °C) or less or 5 volts indicated?
Yes - Update the ECU software if it doesn't have the latest. (rarely the case) Or swap your ECU with one that is known to be good and recheck. If the problem goes away when using the sub-ECU, keep it.
No - There's an open in the wire between the ECU (B8) and the ECT sensor. Find it and repair it.
Good luck with it.
Honda-Tech Member
Joined: Mar 2011
Posts: 362
Likes: 1
From: North Carolina
Re: Code p0118.. HELP!!!
How is your coolant level in the radiator? These cars are notorious for blown head gaskets.
Honda-Tech Member
Joined: Feb 2002
Posts: 443
Likes: 0
From: Toronto, ON, Canada
Honda-Tech Member
Joined: Apr 2012
Posts: 106
Likes: 0
From: Panama City, FL
Re: Code p0118.. HELP!!!
why do people start treads like this you have a code for ect sensor.....replace the freakin sensor then if the problem continues it could possibly be something else but 9 out of 10 cars it will be the sensor
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