DTC P0116: ECT Sensor Circuit Range/Performance Problem

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Honda S2000, 2004 Honda S2000, 2003 Honda S2000, 2002 Honda S2000, and 2001 Honda S2000. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If DTC P0117 and/or P0118 are stored at the same time as DTC P0116, troubleshoot those DTCs first, then recheck for DTC P0116.
Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Turn the ignition switch ON (II).
Check the ECT with a scan tool or the HDS.
Is about 176 °F (80 °C) or more, or 0.86 V or less indicated?
1. YES - Go to step 3.
2. NO - Go to step 7.
Note the coolant temperature from step 2.
Turn the ignition switch OFF.
Cool the engine for 1 hour.
Check the ECT with a scan tool or the HDS.
Did the ECT change 3.6 °F (2 °C) or more?
1. YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
2. NO - Replace the ECT sensor (see SPECIAL TOOLS ).
Note the coolant temperature from step 2.
Start the engine. Hold the engine speed at 3,000 RPM without load (in neutral) until the radiator fan comes on, then let it idle.
Check the ECT with a scan tool or the HDS.
Does the ECT change 3.6 °F (2 °C) or more?
1. YES - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.
2. NO - Replace the ECT sensor (see SPECIAL TOOLS ).