Test N - Key Power Check
To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault: Charging system overcharging. Battery charger connected with engine running. Jump starting vehicle.
- Turn key off and wait 10 seconds. Install breakout box and connect ECA. Set DVOM on 20-volt scale and connect to test pin 5 and 60. During KEY ON/ENGINE RUNNING (KOER) 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 displayed, go to next step.
- Continuous Code 65 Displayed. Perform KEY ON/ENGINE OFF SELF-TEST and record service codes. If continuous code 65 is displayed, check charging system for intermittent overcharging condition (above 17.5-volts). If code 65 is not displayed, fault cannot be duplicated at this time. Continuous code 65 testing is complete.
- Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box and connect ECA. Set DVOM on 20-volt scale. Measure voltage between test pin 5 and 60, and perform KOER SELF-TEST. If reading is above 7.5-volts and code 55 is displayed, replace ECA and repeat QUICK TEST . If reading is above 7.5-volts and code 55 is not displayed, 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 on 200-ohm scale. Measure resistance between test pin 5 and key power terminal on EEC power relay. If reading is 5 ohms or less, check charging system for undercharging condition. If reading is more than 5 ohms, repair open in key power circuit and repeat QUICK TEST .
- Continuous Code 55 Displayed. Perform KEY ON/ENGINE OFF SELF-TEST and record service codes. If continuous code 55 is displayed, check charging system for intermittent overcharging condition (above 17.5-volts). If code 55 is not displayed, fault cannot be duplicated at this time. Continuous code 55 testing is complete.