TL V6-3.5L (2007)
Ignition Timing: Testing and Inspection
Ignition Timing Inspection
1. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC).
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain control module (PCM). If it doesn't
communicate, troubleshoot the DLC circuit.
4. Start the engine. Hold the engine speed at 3,000 rpm with no load (in park or neutral) until the radiator fan comes on, then let it idle.
5. Check the idle speed.
6. Jump the SCS line with the HDS.
7. Remove the right side engine compartment cover.
8. Connect the timing light to the No.1 ignition coil harness.
9. Aim the light toward the pointer (A) on the timing belt cover. Check the ignition timing under a no load condition, (headlights, blower fan, rear
window defogger, and air conditioner are turned off).
10. If the ignition timing differs from the specification, check the cam timing. If the cam timing is OK, update the ECM/PCM if it does not have the
latest software, or substitute a known-good ECM/PCM, then recheck. If the system works properly, and the ECM/PCM was substituted, replace
the original ECM/PCM.
11. Disconnect the HDS and the timing light.
12. Reinstall the right side engine compartment cover.
