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. Run the engine at idle and verify the following.
- Shift selector lever to P range (A/T) / Neutral (M/T).
- Set steering wheel straight ahead.
- Turn all electrical loads OFF.
- Wait for electric coolant fan to stop.




Inspection
1. Connect a timing light to the high-tension lead of the front trailing side.
2. Connect a tachometer.

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




3. Connect the special service tool (SST) to the data link connector.
4. Set switch A to position 1.
5. Set TEST 5W to SELF-TEST.
6. Verify that the idle speed is within specification.

Idle speed: 550-950 rpm




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

Ignition timing:
- Trailing side: 2O°ATDC
- Leading side: 5°ATDC

8. If the timing is incorrect, check the following items:




Verify that no trouble code number is present for the following circuits:
- Code 05-Knock sensor
- Code 13-Manifold absolute pressure sensor

If trouble code numbers are present, check for cause by referring to the specified diagnostic trouble code (DTC) check sequence.

Check powertrain control module engine (PCME) input signals from the following circuits:
- E/L, P/S, A/C, Coolant fan signals to the PCME
- Crankshaft Position Sensor (NE, signal)
- Manifold Absolute Pressure Sensor
- Throttle Position Sensor
- Neutral Switch / Clutch Switch (M/T)
- Park/Neutral Signal (A/T)

Verify correct terminal pin voltage at PCME terminal 31
- Refer to PCME Pin Tests.

9. Disconnect the SST.




10. Verify that the ignition timing advances when the engine speed is above 1,500 rpm.