Fuel and Emissions Systems
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11-8 |
When the vehicle has one of these symptoms, check the Diagnostic Trouble Code (DTC) with the scan tool. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.
Symptom | Diagnostic procedure | Also check for |
Engine will not start
(MIL works OK, no DTCs set) |
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Engine will not start (MIL comes on and stays on, or never comes on at all, no DTCs set) | Troubleshoot the MIL circuit (see page 11-77). | |
Engine will not start
(immobiliser indicator light comes on) |
Troubleshoot the immobiliser system, refer to the 2001 Civic Shop Manual (see page 22-245). | |
Hard starting
(MIL works OK, no DTCs set) |
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Cold fast idle too low
(MIL works OK, no DTCs set) |
Check the idle speed (see page 11-110). | |
Cold fast idle too high
(MIL works OK, no DTCs set) |
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Idle speed fluctuates
(MIL works OK, no DTCs set) |
Intake air leaks | |
After warming up, idle speed is below specifications with no load
(MIL works OK, no DTCs set) |
Vacuum hose clogged/cracked/poor connection | |
After warming up, idle speed is above specifications with no load
(MIL works OK, no DTCs set) |
Troubleshoot the ALT FR signal circuit, refer to the 2001 Civic Shop Manual (see page 11-120). | |
Low power
(MIL works OK, no DTCs set) |
Low compression | |
Engine stalls
(MIL works OK, no DTCs set) |
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