Test N - Key Power Check
- Turn key OFF and wait 10 seconds. Install breakout box with ECA connected. Set DVOM to 20 volt scale and connect to test pins 5 and 60. During Engine Running Self-Test, observe DVOM and record codes. If reading is above 17.5 volts, repair charging system for overcharging condition. If reading is below 17.5 volts and code 65 is displayed, replace ECA and repeat QUICK TEST. If reading is below 17.5 volts and code 65 is NOT present, go to next step.
- Continuous Code 65 Displayed. If code 65 is displayed during KOEO Self-Test, repair charging system for intermittent overcharge condition (above 17.5 volts).
- Turn key OFF and wait 10 seconds. Disconnect ECA. Inspect for and repair any damaged wiring. Connect breakout box and reconnect ECA. Set DVOM to 20 volt scale. Measure voltage between test pins 5 and 60, then repeat Engine Running Self-Test. If reading stays above 7.5 volts and code 55 is displayed, replace ECA and repeat Quick Test. If reading stays above 7.5 volts and code 55 is NOT present, go to step 5). If reading drops below 7.5 volts, go to next step.
- Turn key OFF. With breakout box installed and ECA connected, set DVOM to 200 ohm scale. Measure resistance between test pin 5 and key power terminal on EEC power relay. If reading is 5 ohms or less, repair undercharging condition. If reading is more than 5 ohms, repair open in key power circuit and repeat QUICK TEST.
- Continuous Code 55 Displayed. If code 55 is not present during KOEO Self-Test, charging system is good at this time. If code 55 is displayed, repair intermittent overcharging condition.