Honda 2004 Odyssey Service Manual page 415

PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0116: ECT Sensor Range/Performance
Problem
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.
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then let it idle.
2. Check the ECT with the scan tool or the HDS.
Is 17 6 200°F ( 80 93°C) or 0.4 0.7 V
indicated?
YES Go to step 3.
NO Check the thermostat and the cooling system.
If they are OK, replace the ECT sensor.
3. Test drive the vehicle with the scan tool connected,
and monitor the thermostat and cooling system for
abnormal fluctuations in temperature readings.
Are there any f luctuations in the temperature
readings?
YES Check the thermostat and cooling system.
NO Intermittent failure, system is OK at this
time.
11-106 11-106
DTC P0117 '99-00, '02-04 Models:
Sensor Circuit Low Voltage
1. Turn the ignition switch ON (II).
2. Check the ECT with the scan tool or the HDS.
Is 302°F ( 150°C) or higher ( or H-Limit in the HDS),
or 0 V indicated?
YES Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the ECT sensor and the PCM.
3. Disconnect the ECT sensor 2P connector.
4. Check the ECT with the scan tool or the HDS.
Is 302°F ( 150°C) or higher ( or H-Limit in the HDS),
or 0 V indicated?
YES Go to step 5.
NO Replace the ECT sensor.
5. Turn the ignition switch OFF.
6. Disconnect PCM connector C (31P).
7. Check the continuity between ECT sensor 2P
connector terminal No. 2 and body ground.
ECT SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES Repair short in the wire between the PCM
(C26) and the ECT sensor.
NO Substitute a known-good PCM and recheck
(see page 11-5). If normal ECT readings are
indicated, replace the original PCM.
ECT
ECT
(RED/WHT)