Ignition Timing Inspection

Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see HOW TO USE THE HDS OR A SCAN TOOL ), and check for DTC's.
If a DTC is present, diagnose and repair the cause before inspecting the ignition timing.
Start the engine. Hold the engine at 3,000 RPM with no load (in Park or Neutral) until the radiator fan comes on, then let it idle.
Check the idle speed (see DTC P0506: IDLE CONTROL SYSTEM RPM LOWER THAN ).
Follow the tester's prompts in the "SCS" menu (see the tester operator's manual).
Connect the timing light to the service loop.

Fig 1: Connecting Timing Light To The Service Loop
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Aim the light toward the pointers (A) on the cam chain case. Check the ignition timing under no load conditions: headlights, blower fan, rear window defogger, and air conditioner are not operating. If the ignition timing differs from the specification, replace the engine control module (ECM)/ powertrain control module (PCM) (see HOW TO REMOVE THE ECM/PCM FOR TESTING ).
Ignition Timing

M/T: 8°+/-2° BTDC (RED mark (B)) during idling in neutral

A/T: 8°+/-2° BTDC (RED mark (B)) during idling in P or N

Fig 2: Checking Ignition Timing Under No Load Conditions
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch OFF.
Disconnect the HDS and the timing light.