Ignition Timing

***UPDATED BY TSB# G00190, JUNE 1990

1. Warm up the engine to normal operating temperature, and check the condition of the engine (spark plugs, leaks in hoses, etc.).
2. Turn all electrical loads OFF.

Fig. 17 Diagnostic Connector:

3. Connect the MAZDA SPECIAL SERVICE TOOL #49 B019 9A0 to the diagnosis connector.

Note: If the SST is not used, jump across the TEN terminal and the GND terminal of the diagnostic connector.

Caution: Be extremely careful when making connections to the diagnosis connector as a mistaken connection will cause a malfunction. If the power connector terminal is grounded (Blue: 1-pin); the wiper 20A fuse will be burned.

4. Connect a timing light. (If you experience any timing light operation problems, Refer to TSB# G00190, 1990).

Fig. 15 Test Connector Blue:

Fig. 16 Test Connector IG -:

5. Connect a tachometer to the diagnosis connector IG- terminal.

Note: When using an externally powered tachometer and/or timing light connect it to the power connector (blue: 1-pin).

6. Set SST switch "A" to position 1.
7. Set TEST SW to SELF-TEST.
8. Apply parking brake.
9. Check that idle speed is within specification.

IDLE SPEED
850 ± 50 rpm (Neutral or P range)

Fig. 18 Timing Mark:

10. Check if the timing mark (yellow) on the crankshaft pulley and the mark on the timing belt cover are aligned.

Ignition timing:
10 ± 1° BTDC (at idle)

Fig. 19 Distributor Bolts:

11. If the marks are not aligned, loosen the crank angle sensor lock bolt, and turn the crank angle sensor to make the adjustment.
12. Tighten the crank angle sensor lock bolt to the specified torque.

Torque specification
14-19 ft-lb (19-25 Nm)

13. After adjusting the ignition timing, disconnect the SST or remove the jumper wire.