Diagnostic Aids
Perform this test when directed by QUICK TEST. This test is intended to diagnose only the following components or systems:
- ECA
- Harness circuits (KAPWR)
Continuous Memory Code 15/512 may be displayed when power to Keep-Alive Memory (KAM) test pin No. 1 at ECA is interrupted. This code may be set when installing a breakout box, and may be displayed the first time self-test is performed and power is restored to ECA. Repeat self-test to ensure correct diagnosis.
2) Inspect Engine Compartment Wire Routing Ensure EEC-IV components and wiring are not close to high-tension secondary voltage wires or ignition components. If EEC-IV wiring is close to high-tension wires, reroute EEC wiring. Clear codes and wait 5 minutes. Repeat KOEO SELF-TEST. If Continuous Memory Code 15/512 is no longer displayed, Continuous Memory Code 15/512 testing is complete; service other codes as necessary. If Continuous Memory Code 15/512 is still displayed, go to next step.
3) Code 15/511: Check KAPWR Circuit Voltage Code 15/511 indicates ECA memory (ROM) failed during KOEO SELF-TEST. Turn ignition off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for damaged pins and loose wires. Service as necessary. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Connect DVOM positive test lead to test pin No. 1 and negative test lead to pin No. 40 or 60 at breakout box. With KOEO, observe voltage reading while wiggling, bending and shaking small sections of EEC harness from EEC to dash. If reading is less than 10.5 volts, repair open circuit; reconnect ECA and repeat QUICK TEST. If reading is 10.5 volts or more, replace ECA; remove breakout box and repeat QUICK TEST.