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Which sub-boards needed for Toyota 4A-FE or 7A-FE?


Dan No
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I have a couple of old G1 v4 ECUs. Wondering what sub-board is needed to work with the distributor triggering on Toyota 4A-FE or 7A-FE engines? These are newer than 4A-GE and have no crank-trigger. Everything runs off the distributor. Thanks.

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They will probably have a 24 and 1 configuration in the distributor. You would require a sub-board for the 24 and 1 (same as 3sge). This however is the most popular sub-board and we have run out.

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  • 2 weeks later...

Reviewing the G1 v4 manual, I found this section:

6.3.2 Trigger & Hardware Requirements
Cylinder Pulse
For the correct timing of ignition, the crank or cam sensor MUST provide
a signal that can be decoded to produce one pulse per engine TDC.  On a
4-cylinder engine for example, this is 2 TDC pulses per crankshaft
revolution (4 per Camshaft revolution) and an 8-cylinder engine will have
4 TDC per crankshaft revolution (8 per camshaft revolution)
Sync Pulse
To determine the correct firing sequence, a sync pulse is required as a
reference to determine engine position. The sync pulse can only appear
once on the crankshaft (1 signal per engine revolution) or once on the
camshaft (1 signal per engine cycle).
 

Here is the G and NE trigger signals from the cam-driven distributor.

Waveforms-GNE.gif~original

NE satisfies Cylinder Pulse 4 per Camshaft revolution requirement and
G satisfies Sync Pulse once on the camshaft (1 signal per engine cycle) requirement.

Which sub-board would be needed for this configuration? Would you be able to release technical-details on the sub-board functions or schematics? I would be able to build a sub-board if I'm not successful in finding one from one of your dealers.

Thank you.

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  • 1 month later...

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