Ignition Timing: Testing and Inspection
Ignition Timing Inspection1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC), and check for DTCs. If a DTC is present, diagnose and repair the cause before inspecting the ignition timing.
2. Start the engine. Hold the engine at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
3. Check the idle speed.
4. Select "SCS" mode using the HDS.
5. Connect the timing light to the No. 1 ignition coil wire.
6. Aim the light toward the pointer (A) on the oil pump. Check the ignition timing under no load condition. (Headlights, blower fan, rear window defogger, and air conditioner are turned off)
7. If the ignition timing differs from the specification, check the cam timing. If the cam timing is OK, update the engine control module (ECM) if it does not have the latest software (2002-2005 M/T models and CVT model), or substitute a known-good ECM, then recheck. If the system work properly, and the ECM was substituted, replace the original ECM.
8. Disconnect the HDS and the timing light.