DIS Schematic and Breakout Box Overlay Acronyms

Ignition Systems, Timing Procedures and Diagnostics


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DIS Schematic and Breakout Box Overlay Acronyms


There is a logic to the names on the Schematic and Overlays for the DIS DIAGNOSTIC HARNESS that will help you.

DIS Acronyms

PIP Profile Ignition Pickup (Crankshaft Sensor signal).

CID Cylinder IDentification.

SPOUT SPark OUT (EEC Spark control signal).

IDM Ignition Diagnostic Monitor (Diagnostic signal to EEC-IV).

VBAT Battery Positive.

IGGND Low current ground reference.

DPI Dual Plug Inhibit (High - Right Plugs fire; Low - Both Sides fire).

C1, C2, C3 Coil Drive (For Coils 1, 2, and 3).

Overlay Designators

On the Schematic and Overlays, each of these signals is identified along with a suffix letter that tells you where the measurement is being taken. The key to these letters is:

Prefix "J" is a breakout box jack.

Suffix "D" is at the DIS Module.

Suffix "S" or "PS" or "CS"
is at the sensor, "P" for PIP, "C" for CID.

Suffix "EEC" is at the signal source (the sensor).

Suffix "C" is at the coil.

A couple of examples:

VBAT PS means VBAT at the PIP Sensor.

VBAT D means VBAT at the DIS Module.