Circuit Test B - EEC-V Power Relay
WARNING: This page is about a different car, the 1996 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
This circuit test is only intended to diagnose the following components and circuits:
- Vehicle wiring harness circuits (VPWR, IGNITION START/RUN, B+ and Ground).
- EEC-V power relay.
- Powertrain Control Module (PCM).
- Step 1) Check VPWR Circuit Continuity Turn ignition off. Disconnect Idle Air Control (IAC) solenoid and EEC-V power relay wiring harness connectors. Disconnect scan tool (if applicable). Measure resistance between VPWR terminal of IAC solenoid connector and VPWR terminal of EEC-V power relay. If resistance is less than 5 ohms, reconnect IAC solenoid and go to next step. If resistance is 5 ohms more, repair open in VPWR circuit between EEC-V power relay and IAC solenoid.
- Step 2) Check Voltage To EEC-V Power Relay Leave ignition off and EEC-V power relay disconnected. Connect DVOM negative lead to negative battery terminal. Measure voltage at B+ terminal of EEC-V power relay connector. Turn ignition on. Measure voltage at IGN START/RUN. If voltage is less than 10.5 volts, repair open circuit and repeat QUICK TEST . If voltage is more than 10.5 volts, replace EEC-V power relay and repeat QUICK TEST .
- Step 3) Check Ground Circuit To EEC-V Power Relay Leave ignition off and EEC-V power relay disconnected. Measure voltage between Ground terminal and B+ terminal of EEC-V power relay. If resistance is more than 10.5 volts, replace EEC-V power relay. If resistance is 10.5 volts or less, repair open in Ground circuit.