Circuit Test B - EEC-V Power Relay

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).

Fig 1: EEC-V Power Relay Test Circuits

1. 1) Check VPWR Circuit Resistance  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.
2. 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.
3. 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 and repeat QUICK TEST .