Ignition Timing Inspection

Connect the HDS to the data link connector (DLC) (see step 2 under HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM) ), and check for DTCs. 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 N or P position) 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.
Remove the right upper fender trim (see step 1 under DRIVE BELT INSPECTION ).
Connect the timing light to the No. 1 ignition coil harness.

Fig 1: Checking Ignition Timing
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 P or N position

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