Ignition Timing: Testing and Inspection

Ignition Timing Inspection

1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). Initial Inspection and Diagnostic Overview

2. Turn the ignition switch to ON (II).

3. Make sure the HDS communicates with the vehicle and the powertrain control module (PCM) If it does not communicate, troubleshoot the DLC circuit.. Testing and Inspection

4. Check for DTCs. Initial Inspection and Diagnostic Overview If a DTC is present, diagnose and repair the cause before continuing with this test.

5. Start the engine. Hold the engine speed at 3,000 rpm with no load (in N or P) until the radiator fan comes on, then let it idle.

6. Check the idle speed. Testing and Inspection

7. Jump the SCS line with the HDS.

8. Connect the timing light to the exhaust side No. 1 ignition coil harness.






9. 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).





10. If the ignition timing differs from the specification, check the cam timing. If the cam timing is OK, update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM, Initial Inspection and Diagnostic Overview then recheck. If the system works properly, and the PCM was substituted, replace the original PCM. Service and Repair

11. Disconnect the HDS and the timing light.