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 ).
Jump the SCS line with the HDS.
Free the service loop from the wire harness, then 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 cam chain case. Check the ignition timing under a no load condition (headlights, blower fan, rear window defogger, and air conditioner are turned off).
Ignition Timing

M/T: 8°+/-2° BTDC (RED mark (B)) at idle in Neutral

A/T: 8°+/-2°BTDC (RED mark (B)) at idle in Park or Neutral

Fig 2: Identifying Timing Pointer
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If the ignition timing differs from the specification, 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, and the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).
Disconnect the HDS and the timing light.
Secure the service loop to the wire harness with wire ties.