Ignition Timing

Timing Check:

NOTE: Ignition timing is ECU controlled and factory set. It should not be tampered with.


PREPARATION

1. Warm engine to operating temperature.
2. Run engine at idle. Place gear selector in "P" (A/T) or neutral (M/T). Set steering wheel straight ahead, turn off all electrical loads, and wait for electric cooling fan to stop.

INSPECTION

1. Connect timing light. Connect tachometer to diagnosis connector terminal IG-.

NOTE: Connect light to high tension lead of front trailing side. Some timing light will not operate even if ignition system is okay.

2. Connect SST's (System Selector 49 B019 9A0 and Self Diagnosis Checker 49 H018 9A1) to diagnosis connector. Set switch "A" to position "1" and Test Switch to "SELF TEST."

NOTE: If SST is not used, install jumper wire between TEN and GND terminals of diagnosis connector.

3. Verify that idle speed is within specification:

Idle Speed: 550 - 950 rpm

Timing Marks:

4. Verify that timing mark (white) on crank angle sensor plate is aligned with indicator pin.

Trailing Side: 20° ATDC (-20° BTDC)
Leading Side: 5° ATDC (-5° BTDC)

5. If timing is incorrect, check the following:
a. Check for service codes. If present, check possible causes. Knock sensor (code 05) and pressure sensor (code 13) problems can cause out of specification timing.
b. ECU input devices: E/L, P/S, A/C, electric cooling fan, crank angle sensor, throttle sensor, neutral and clutch switches (M/T), inhibitor signal (A/T).
c. ECU terminal 3I voltage; should be approximately 5V with ignition "ON."
6. Disconnect SST or remove jumper wire from diagnosis connector.
7. Verify timing advances when engine speed is raised above 1500 rpm.