Ignition Timing: Testing and Inspection
Ignition Timing Check1. Before inspection and adjustment set vehicle in the following condition.
- Engine coolant temperature: 80 - 95°C (176 - 203°F)
- Lights, electric cooling fan and all accessories: OFF
- Transaxle: Neutral (P range on vehicles with A/T)
2. Turn the ignition switch to OFF and connect the scan tool to the data link connector.
3. Set up a timing light
4. Start the engine and run at idle.
5. Select No. 22 of the SCAN TOOL DATA LIST.
6. Check that engine idle speed is within the standard value.
Standard value: 750 ± 100 r/min
7. Select No. 17 of the SCAN TOOL ACTUATOR TEST.
8. Check that basic ignition timing is within the standard value.
Standard value: 5° BTDC ± 3°
9. If the basic ignition timing is outside the standard value, inspect the MFI components by referring to Powertrain Management; Testing and Inspection.
10. Press the scan tool clear key (Select a forced driving cancel mode) to release the ACTUATOR TEST.
NOTE: If the test is not canceled, a forced driving will continue for 27 minutes. Driving under this condition may damage the engine.
11. Check that the actual ignition timing is at the standard value.
Standard value: Approximately 8° BTDC
NOTE:
1. Ignition timing is variable within about ±7°, even under normal operating.
2. And it is automatically further advanced by about 5° from 8° BTDC at higher altitudes.