Ignition Timing: Testing and Inspection

Ignition Timing Inspection

1. Connect the Honda PGM Tester or the Honda Diagnostic System (HDS) to the data link connector (DLC), and check for DTC's. If a DTC is present, diagnose and repair the cause before inspecting the ignition timing.
2. Start the engine. Hold the engine at 3,000 rpm with no load (in Neutral) until the radiator fan comes on, then let it idle.
3. Check the idle speed.
4. Follow the tester's prompts to get the tester in the "SCS" mode (see the tester operator's manual).




5. Connect the timing light to the service loop.




6. Aim the light toward the pointer (A) on the timing belt cover. Check the ignition timing under no load condition: headlights, blower fan, rear window defogger, and air conditioner are not operating.

Ignition Timing: 10° ± 2° BTDC (RED mark (B)) at idle in Park or Neutral

7. If the ignition timing differs from the specification. Update the powertrain control module (PCM) if it does not have latest software, or substitute a known-good PCM, then recheck. If the ignition system works properly, replace the original PCM.
8. Disconnect the Honda PGM Tester or the HDS, and the timing light.