Ignition Timing Inspection

Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on IF THE MIL (MALFUNCTION INDICATOR LAMP) HAS COME ON ), 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 without load (in Park or Neutral) until the radiator fan comes on, then let it idle.
Check the idle speed (see IDLE SPEED INSPECTION ).
Select "SCS" mode using 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 pointers (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).

Fig 2: Identifying Timing Mark With Timing Specifications
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 engine control module (ECM)/powertrain control module (PCM) if it does not have the latest software (see HOW TO UPDATE THE ECM/PCM ), or substitute a known-good ECM/PCM (see HOW TO SUBSTITUTE THE ECM/PCM (2002-2004 MODELS) ), then recheck. If the system works properly, and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
Turn the ignition switch OFF.
Disconnect the HDS and the timing light.