Ignition Timing: Adjustments
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 AFF)
2. Insert a paper clip from the harness side into the 1 pin connector (blue) as shown in the illustration at left.
3. Connect a primary-Voltage-detection type of tachometer to the paper clip.
NOTE: Do not use the scan tool. If tested with the scan tool connected to the data link connector, the ignition timing will not be the basic timing but be ordinary timing.
4. Set up a timing light
5. Start the engine and run at idle.
6. Check that engine idle speed is within the standard value.
Standard value: 750 ± 100 rpm
NOTE: For rpm, one-half of the actual engine rpm is indicated, so the actual engine rpm is two times the indicated valve shown by the tachometer.
7. Turn the ignition switch to OFF.
8. Remove the waterproof connector from the ignition timing adjustment connector (brown).
9. Connect the jumper wire with the clip to the ignition timing adjustment terminal, and ground this to the body as illustrated.
NOTE: Grounding this terminal sets the engine to the basic ignition timing.
10. Start the engine and run it at idle.
11. Check that basic ignition timing is within the standard value.
Standard value: 5° BTDC ± 3°
12. If the basic ignition timing is outside the standard value, inspect the MFI components.
13. Stop the engine, remove the jumper wire from the ignition timing adjustment connector (brown), and return the connector to its original condition.
14. Start the engine and check that the actual ignition timing is at the standard value.
Standard value: Approx. 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.