Honda ACCORD HYBRID 2005 Service Manual page 330

PGM-FI System
D T C T r o u b l e s h o o t i n g ( c o n t ' d )
DTC P0125: ECT Sensor 1 Malfunction/Slow
Response
1. Start the engine, and let it idle 5 minutes or more.
2. Check ECT SENSOR 1 in the DATA LIST w i t h the
HDS.
Is about 10 °F (- 12 °C) or less, or 4.45 V or more
indicated?
Y E S — G o t o step 9.
N O — G o t o step 3.
3. A l l o w the engine to cool t o 104 °F (40 °C) or less.
4. Note the value of ECT SENSOR 1 and ECT SENSOR
2 in the DATA LIST w i t h the HDS.
5. Start the engine, and let it idle.
6. Let the engine idle until ECT SENSOR 1 goes up
49 °F (27 °C) or more f r o m the recorded
temperature.
7. Note the value of ECT SENSOR 2 in the DATA LIST
w i t h the HDS.
8. Compare ECT SENSOR 2 and the recorded
temperature.
Did ECT SENSOR 2 change 17 °F (9.5 °C) or
more?
Y E S — I n t e r m i t t e n t failure, system is OK at this t i m e .
Check for poor connections or loose terminals at
ECT sensor 1, ECT sensor 2, and the PCM.B
NO—Check the thermostat (see page 10-4), then go
to step 9.
9. Turn the ignition switch OFF.
10. Replace ECT sensor 1 (see page 11-215).
11. Turn the ignition switch ON (II).
12. Reset the PCM w i t h the HDS.
13. Do the PCM idle learn procedure (see page 11-340).
14. A l l o w the engine to cool t o the outside temperature.
15. Start the engine, and let it idle 20 minutes.
16. Check for T e m p o r a r y DTCs or DTCs w i t h the HDS.
Are any Temporary DTCs or DTCs indicated?
Y E S — I f DTC P0125 is indicated, check for poor
connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go to step 1. If any
other T e m p o r a r y DTCs or DTCs are indicated, go to
the indicated D T C s t r o u b l e s h o o t i n g .
N O — G o t o step 17.
17. M o n i t o r the OBD STATUS for DTC P0125 in the
DTCs MENU w i t h the HDS.
Does the screen indicate PASSED?
Y E S — T r o u b l e s h o o t i n g is complete. •
NO—If the screen indicates FAILED, check for poor
connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go t o step 1. If the
screen indicates NOT COMPLETED, go to step 14
and recheck.
11-90