Ignition Timing: Testing and Inspection
Ignition Timing Inspection1. Connect the 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 with no load (in Neutral) until the radiator fan comes on, then let it idle.
3. Check the idle speed, and adjust it if necessary.
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). Check the ignition timing under a no load condition:
headlights, blower fan, and air conditioner are turned off. If the ignition timing differs from the specification below, replace the Engine Control Module (ECM).
Ignition Timing:
5° ± 2° BTDC (RED mark (B)) at idle in Neutral
7. Turn the ignition switch OFF.
8. Disconnect the HDS and the timing light.