Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2.
Turn the ignition switch to ON (II).
3.
Make sure the HDS communicates with the vehicle. If it does not communicate, go to the DLC circuit troubleshooting.
Warm Up The Engine
Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
Idle Speed - Inspection (Natural Gas Model)
NOTE:
Before checking the idle speed, check these items:
－
The malfunction indicator lamp (MIL) has not been reported on, and there are no DTCs.
－
Ignition timing
－
Spark plugs
－
Air cleaner
－
PCV system
Apply the parking brake, and make sure the headlights are off.
1.
Check the idle speed without load conditions: headlights, blower fan, radiator fan, and air conditioner off.
Idle speed should be: 670±50 rpm (in P or N)
2.
Let the engine idle for 1 minute with high electric load (A/C on, temperature set to max cool, blower fan on high, headlights on high beam).
Idle speed should be: 710±50 rpm (in P or N)
NOTE: If the idle speed is not within specification, do the PCM idle learn procedure. If the idle speed is still not within specification, go to the symptom troubleshooting.
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Test yourself
A quick Honda Civic quiz: every answer comes with an explanation and a link to the manual page.
Inspection
