Preliminary Testing Notes

^ When making measurements on a wiring harness, both a visual inspection and a continuity test should be performed. Inspect the connector pins for damage (corrosion, bent or spread pins, etc.) when directed to remove a connector.

^ Spark timing adjustments are not possible.

^ When making voltage checks a GROUND reading means any value within a range of zero to 1 volt. Also VPWR or COIL PWR readings mean any value that falls within a range of B+ to 2 volts less than B+.

^ When making voltage checks and a reference to ground is made use either the negative battery lead or cast Iron on the engine. B+ means the positive battery cable at the battery.

^ When using the spark plug firing indicator, place the grooved end as close as possible to the plug boot. Very weak or no flashing may be caused by a fouled plug.

^ Do not use an incandescent test lamp to check the CKP-, CKP+, PIP, IDM, or SPOUT circuits. The lamp will prevent the circuit from operating.