Test N: Step 20

20) Continuous Memory Code 88: Check Continuity of DPI Circuit  Code 88 indicates an open in the Dual Plug Inhibit (DPI) circuit or an open or short to ground in coil No. 4. Possible causes for this fault are:

• Open or short circuit in harness
• Faulty ECA
• Faulty DIS module
• Faulty coil No. 4

Turn key off and wait 10 seconds. Disconnect DIS connector (pins No. 1-6). Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion or loose wires. If connector is damaged, repair as necessary. Install breakout box and leave ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between pin No. 6 at the DIS vehicle harness connector and Test Pin No. 32 at the breakout box. If resistance is less than 5 ohms, remove breakout box, reconnect all components. Diagnose DIS ignition system. If system is okay, replace ECA. If resistance is not less than 5 ohms, repair open circuit, remove breakout box, reconnect all components and rerun QUICK TEST.