Mallory Ignition ACCEL timing computer 49340 - Manual (Page 15)

T ROUBLE SHOOTING THE A CCEL T IMING C OMPUTER
our A CCEL T IMING C OMPUTER has features that test functions through your key pad.
iagnostic Mode does not perform any Control Mode engine functions, and if you enter
iagnostic Mode with the engine running, your engine will stall.
(Read this whole section before entering Diagnostic Mode)
ISPLAY , P ROCESSOR , and M EMORY test
Enter Diagnostic Mode by simultaneously pressing and releasing three keys:
N 2 O R ETARD , B OOST R ETARD , and T IMING . The display will show 0 0 0 0 0 .
About every two seconds the display will increment: 11100, 22200, up to 99900.
The ‘degree dot’ will appear with the odd numbered (33300, 55500) displays.
EY P AD test
When 99900 appears the ‘programming dot’ will start flashing. From now on you must
press the proper key within eight seconds or the module will return to Control Mode.
Keys must be pressed in order:
D ISPLAY P RESS
9 9 9 0 0 N 2 O R ETARD
111 0 0 B OOST R ETARD
2 2 2 0 0 T IMING
3 3 3 0 0 ⇓ ( DOWN A rrow)
4 4 4 0 0 ⇑
( UP A rrow)
5 5 5 0 0 RPM
6 6 6 0 0 SAVE
7 7 7 0 0 VAC ADV
D IAGNOSTIC M ODE
After each key is pressed the display will update.
It starts at 111 0 0 and increments to 7 7 7 0 0 as
each key is pressed, in order. If the proper key
is not pressed within eight seconds Diagnostic
Mode ends and returns you to Control Mode.
If you press the correct key and the display does
not update (and the unit exits Diagnostics), the
test has found a key pad failure.
When the last key (VAC ADV) is released the unit
returns to Control Mode operation.
LED’s do The Timing Computer is not getting power.
not display Check the 4-Pin connectors’s Red and Black wires. See Pg 10.
Timing light does The engine was not retimed when the Timing Computer was
not show the originally installed, or the wrong number of cylinders was selected
programmed value Re-time the engine. Check the number of cylinders (4, 6, or 8).
(Incorrect cylinder selection can also cause incorrect tach readings.)
LED’s The Timing Computer is not getting a trigger.
Display Check the square input (male) connector,and check all its wires.
0 RPM timing See wiring diagram on Pg 12, and the Triggering chart on Pg 11.
Your A CCEL + DIP-Switch-4 inside your A CCEL + ignition is down.
sparks randomly See Pg 4.
Status Light on The ignition is not firing, or the Timing Computer has unplugged
Your A CCEL + from the ignition. The battery may be low.
is Dim If the connectors and battery are OK, pull a spark plug, lean it
against the engine. It should spark as you crank the starter. See Pg 12.
Status Light on The unit is not sending a trigger signal, probably because
Your A CCEL + it is not receiving a trigger signal. Check the trigger device
is O FF and the square, input connector. See Pg 10.