Checking Digifant II and Digifant I Timing Advance (engine codes RV and PF)

Check timing advance only after determining that the basic ignition timing is adjusted to specification. On cars with onboard fault diagnosis, check the fault memory and correct any faults before proceeding. See FUEL SYSTEM-GASOLINE.

To check timing advance (Digifant):

1.	With the engine idling at normal operating temperature, disconnect the coolant temperature sensor connector.

2.	Raise the engine speed to a steady 2300 rpm and record the basic ignition timing value.

3.	Reconnect the coolant temperature sensor connector.

4.	On Digifant II cars, briefly raise the engine speed to at least 3000 rpm, then recheck the timing at 2300 rpm. It should be 30°±3° more advanced than it was with the coolant temperature sensor disconnected, the basic timing value plus 30°±3°.

5.	On Digifant I cars, recheck the timing at 4500 rpm. It should be at least 30° more advanced than it was with the coolant temperature sensor disconnected, the basic timing value plus at least 30°.

On Digifant II, if the timing only advances by about 20°, first check the knock sensor tightening torque as described in 4.5 Checking and Replacing Knock Sensor, then check knock sensor resistance and check for faults in the wiring harness as described in 4.6 Troubleshooting Knock Sensor System. If mounting torque, sensor resistance and the wiring harness are all OK, then the Digifant control unit is probably faulty.

On Digifant I, if the timing does not advance as specified, then there is a fault in either the air flow sensor or the control unit. See FUEL SYSTEM-GASOLINE.