Ground Circuits
- Turn ignition off. Connect negative lead of an ohmmeter to ground. Connect other lead to ECU terminals No. 5, 11, 19 and 25 in turn. Ohmmeter should indicate zero ohms at all terminals
- If any terminal shows a high resistance or infinite resistance, the wire connected to that terminal must be traced and repaired. Wires are grounded at intake manifold. Also check ground wire between valve cover and firewall.