Honda Civic Service Manual: Ignition Timing Inspection (K24Z7)

1.

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.

1.

Check for DTCs. If a DTC is present, diagnose and repair the cause before continuing with this inspection.

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.

1.

Check the idle speed without electrical load: headlights, blower fan, radiator fan, and air conditioner off.

Idle speed should be:

USA and Canada models: 720±50 rpm (A/T in P or N, M/T in neutral)

Mexico models: 710±50 rpm (A/T in P or N, M/T in neutral)

2.

Let the engine idle for 1 minute with high electric load (A/C switch on, temperature set to max cool, blower fan on High, and headlights on high beam).

Idle speed should be:

USA and Canada models: 720±50 rpm (A/T in P or N, M/T in neutral)

Mexico models: 710±50 rpm (A/T in P or N, M/T in neutral)

NOTE: If the idle speed is not within specification, do the ECM/PCM idle learn procedure. If the idle speed is still not within specification, go to symptom troubleshooting.

1.

Jump the SCS line with the HDS.

2.

Connect the timing light to the service loop (white tape).

3.

Aim the light toward the pointer (A) on the cam chain case. Check the ignition timing under a no load condition (headlights, blower fan, rear window defogger, and air conditioner are turned off).

4.

If the ignition timing differs from the specification, check the cam timing. If the cam timing is OK, update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the system works properly, and the ECM was substituted, replace the original ECM.

5.

Disconnect the HDS and the timing light.