D4 - Check For Coil PWR to Left Coil Fault

WARNING: Never connect PCM to the EEC breakout box when performing EI diagnostics.

^ Key off.

^ Install EI (High Data Rate) diagnostic harness to breakout box.

^ Install the left coil tee. The tee is yellow (left coil).

^ Connect EI diagnostic harness negative lead to battery.

^ Use 4.6L EI (High Data Rate) 8 overlay.

^ Set EI harness type switch to "8" position.

^ DVOM on 20 volt DC scale.

^ Key on, engine off.

^ Measure voltage between (+)J11 (COIL PWR L) and (-)J7 (B-) at breakout box.

^ Is DC voltage greater then 10.0 volts?

YES -- Go to D5. D5 - Check For C3 High At Coil Pack

NO -- Check connectors, service or replace harness. COIL PWR is open to left coil. Remove all test equipment. Reconnect all components. Clear continuous memory. Rerun quick test.