Ignition Timing: Testing and Inspection

NOTE: The ignition timing is set at the factory and must not be adjusted. Any adjustment will negatively effect the engine performance.

Preparation
1. Warm up the engine to normal operating temperature.
2. Turn all electric loads OFF
3. Connect the SST (Special Service Tool-System Selector) to the data link connector.




4. Connect a tachometer to the data link connector IG-terminal as shown.

Ignition Timing
The ignition timing is set at the factory and MUST NOT be adjusted. Any adjustment will negatively effect the engine performance.

1. Perform preparation steps 1-4 (refer to above).
2. Verify that the electric coolant fan does not operate.
3. Remove the fuel filler cap.




4. Set SYSTEM SELECT to position 1.
5. Set TEST SW to SELF-TEST.




6. If the SST is not used, connect a jumper wire between the TEN terminal and the GND terminal of the data link connector.
7. Make sure the idle speed is within specification; if not, adjust the idle speed.

Idle speed:
- (Neutral or P range): 550-950 rpm





8. Connect a timing light to the high-tension lead of the front trailing-side.

NOTE:
Some timing lights will not illuminate even if the ignition is working properly.




9. Verify that the timing mark (white) on the crankshaft position sensor plate is aligned with the indicator pin.

Ignition timing:
- Trailing side: 20° ATDC (-20°C BTDC)
- Leading side: 5° ATDC (-5° BTDC)

10. If the timing is incorrect, check the following items.




Check for Diagnostic Trouble Codes
a. Verify that no trouble code number is present for the following circuits.
- 05-knock sensor
- 13-Manifold absolute pressure sensor

b. If trouble a code number is present, check for cause by referring to the related trouble code chart.

Check ECM Input Devices/ Signals
- E/L, P/S, A/C, Coolant fan
- Crankshaft position sensor (NE, signal)
- Manifold absolute pressure sensor
- Throttle position sensor
- Neutral SW / Clutch SW (MT)
- Park / Neutral position signal (AT)
- Voltage @ ECM terminal 3I

11. Disconnect the SST.




12. Verify that the ignition timing advances when the engine is above 1,500 RPM.