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Re: 1987 tbi obd check no response / no code 12??
Check continuity from ALDL ground terminal (Pin A) to ECM connector A12 - system ground (Black/White wire Circuit #450). In the highly unlikely case you may have a broken crimp in ECM interface pin A12. Circuit 450 is shared ground circuit, but it is used with ECM internal ground reference for SES light and ALDL connector.
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"The Beast"
1975 Chevrolet C20 longbed
350/ 700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29) 
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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