Test 1: No Communication With Anti-Lock Control Module
- Turn ignition off. Disconnect ABCM connector (C155). Connect EEC-IV 60-pin breakout box. Turn ignition on. Using a DVOM, measure voltage between breakout box terminal No. 20 (Light Blue wire) and ground. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in Light Blue wire. See WIRING DIAGRAMS .
- Turn ignition off. Measure resistance between breakout box terminal No. 8 (Black wire) and ground. Measure resistance between breakout box terminal No. 24 (Black wire) and ground. If resistances are less than 5 ohms, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If resistance is more than 5 ohms, repair open in circuit(s).