2G Socket Checkpoints

With a 2G ECU, when removing the EPROM it's entirely possible to damage a track on the top of the board and still allow the engine to run, but cause a number of malfunctions.

If the engine runs, it indicates that the connections between the processor (IC1) and the EPROM are okay.

Details

Check for continuity of the tracks to the EPROM as follows (note that there is a 100 ohm series resistor between EPROM pin 22 and IC2 pin 44):

EPROM IC2 IC1 Notes
01 25 63
02 28 60
03 34 55
04 35 54
05 36 53
06 37 52
07 38 51
08 39 50
09 40 49
10 41 48
11 45 11
12 46 12
13 47 13
14 GND
15 48 14
16 49 15
17 50 16
18 51 17
19 52 18
20 GND
21 30 58
22 44 100 ohms
23 29 59
24 31 57
25 32 56
26 27 61
27 26 62
28 +5V

Pin numbers for IC1 and IC2 are printed on the PC board. The EPROM pins are numbered as follows: