Ignition Timing Inspection

Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on 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 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.
Free the service loop from the wire harness, then connect the timing light to the service loop.

Fig 1: Connecting The Timing Light To The Service Loop
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Aim the light toward the pointer (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 off).
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 Park or Neutral

Fig 2: Inspecting Ignition Timing
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 ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING ), or substitute a known-good ECM/PCM (see HOW TO SUBSTITUTE THE ECM/PCM ), then recheck. If the system works properly, replace the ECM/PCM (see ECM/PCM REPLACEMENT ).
Turn the ignition switch OFF.
Disconnect the HDS and the timing light.
Secure the service loop to the wire harness with wire ties.