Honda Accord 2008 Manual page 411

07/11/02 09:03:21 61TA0000_110_0092
PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0128: Cooling System Malfunction
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Make sure the blower switch is OFF.
4. Check the FAN CTRL in the DATA LIST with the
HDS.
Is it OF F ?
YES − Go to step 5.
NO − Wait until the FAN CTRL is off, then go to step
5.
5. Check the radiator fan operation.
Does the radiator f an keep running?
−
YES Check the radiator fan circuit (see page
10-22), and the radiator fan relay (see page 22-91).
If the circuits and the relay are OK, go to step 19.
NO − Go to step 6.
6. Let the engine cool until the coolant temperature is
104 °F (40 °C) or less.
7. Note the value of ECT SENSOR 1 and ECT SENSOR
2 in the DATA LIST with the HDS.
8. Start the engine, and let it idle.
9. Let the engine idle until ECT SENSOR 1 goes up
41 °F (23 °C) or more from the recorded
temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the
HDS.
11-92
11. Compare the value of recorded ECT SENSOR 2 and
the present value of ECT SENSOR 2.
Did temperature rise 14 °F ( 8 °C) or more?
YES − Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
−
NO Test the thermostat (see page 10-4), then go
to step 12.
12. Turn the ignition switch to ON (II).
13. Reset the ECM/PCM with the HDS.
14. Let the engine cool until the coolant temperature is
between 21 °F ( 6 °C) and 104 °F (40 °C). −
15. Do the ECM/PCM idle learn procedure (see page
11-343).
16. Test-drive at a steady speed between 15 75 mph
(24 120 km/h) for 10 minutes. −
17. Check for Temporary DTCs or DTCs with the HDS.
Is DT C P0128 indicated?
YES − Check the cooling system, then go to step 1.
NO − Go to step 18.
18. Monitor the OBD STATUS for DTC P0128 in the
DTCs MENU with the HDS.
Does the screen indicate PASSED?
−
YES Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 17,
go to the indicated DTC's troubleshooting.
NO − If the screen indicates FAILED, check the
cooling system, then go to step 1. If the screen
indicates NOT COMPLETED, go to step 14.
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