DIS Schematic and Breakout Box Overlay Acronyms

13-82 Ignition Systems, Timing Procedures and Diagnostics


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).

RC1, RC2 Right Coil Drive (For Coils 1 and 2 right side of engine).

LC1, LC2 Left Coil Drive (For Coils 1 and 2 left side of engine).

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) except PIPEEC which
comes from the DIS Module.
Suffix "C", is at the coil.

A couple of examples:

RCID means Right Coil, number "1", at the DIS Module
Terminal.

RCIC means Right Coil, number "1", at the Coil Terminal.

VBAT PS means VBAT at the PIP Sensor.

VBAT D means VBAT at the DIS Module.