87 - 89 ECU Pin Outs

87 - 89 TSI “A” connector:

W 1: IGN – (coil)
WB 2: AFS
LR 3: Motor position SW
B 4: GND
GR 5: air Intake temp
YG 6: Coolant temp
YR 7: Idle SW
8: n/c
9: n/c
GR 10: +5 volt power
W 11: O2 sensor
YB 12: ISC – (in)
YB 13: Ignitor advance
LY 14: MPS GROUND backup
GW 15: TPS
BW 16: Barometric sensor
17: n/c
18: n/c
LgB 19: Speed (coil)
RG 20: secondary air (catalyst)
BR 21: Diag. Output
WR 22: control relay (fuel pump)
YL 23: ISC + (out)

87 - 89 TSI “B” connector:

R 1: IGN +12 V
B 2: GND
B 3: GND
RW 4: EGR
BY 5: IGN START(cranking)
BW 6: AC switch
R 7: IGN +12 V
BY 8: GROUND
YG 9: Boost gage
YB 10: Injector 1 (primary)
BR 11: Ignitor signal FOR INJECTOR TIMING
YL 12: injector 2 (secondary)
B 13: +12 V CONSTANT