Ignition Timing Inspection

Connect the Honda Diagnostic System (HDS) to the data link connector (DLC), and check for DTCs (see step 2 in GENERAL TROUBLESHOOTING INFORMATION ). If a DTC is present, diagnose and repair the cause before inspecting the ignition timing.
Start the engine. Hold the engine speed at 3,000 RPM with no load (in Neutral) until the radiator fan comes on, then let it idle.
Check the idle speed (see IDLE SPEED INSPECTION ).
Jump the "SCS" line with the HDS.
Connect the timing light to the service loop.

Fig 1: Connecting Timing Light To Service Loop
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Aim the light toward the pointer (A) on the timing belt cover. Check the ignition timing under a no load condition. (headlights, blower fan, rear window defogger, and air conditioner are turned off)
Ignition Timing:

10° +/- 2° BTDC (RED mark (B)) at idle in Park or Neutral position

Fig 2: Checking Ignition Timing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the ignition timing differs from the specification, check the cam timing. If the timing is OK, update the powertrain control module (PCM) if it does not have the latest software (see PCM UPDATING AND SUBSTITUTION FOR TESTING ), or substitute a known-good PCM (see HOW TO SUBSTITUTE THE PCM ), then recheck. If the ignition system works properly, and the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).
Disconnect the HDS, and the timing light.