Ignition Timing: Testing and Inspection
Ignition Timing Check1. The vehicle should be prepared as follows before the inspection and adjustment.
- Engine coolant temperature: 80 - 95°C (176 - 203°F)
- Lights, electric cooling fan and accessories: OFF
- Transaxle: neutral (P for A/T)
2. Insert a paper clip to the engine speed detection connector (blue), and connect a 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.
3. Set the timing light.
4. Start the engine and run at idle.
5. Check curb idle speed.
Standard value: 700 ± 100 r/min
NOTE: The engine speed indicated is a third of actual speed. In other words, the reading of the tachometer times 3 is actual speed.
6. Turn OFF the ignition switch.
7. Disconnect the waterproof female connector from the ignition timing adjusting connector (brown).
8. Using a jumper wire, ground the ignition timing adjusting terminal.
NOTE: Grounding this terminal sets the engine to the basic ignition timing.
9. Start the engine and run at idle.
10. Check basic ignition timing.
Standard value: 5° BTDC ± 3°
11. If basic ignition timing is not within the standard range, check the crankshaft position sensor by reference to Powertrain Management; Testing and Inspection.
12. Disconnect the jumper wire connected at step (8).
13. Check to be sure that the idling ignition timing is the correct timing.
Standard value: Approximately 15° 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 15° BTDC at higher altitudes.