Diagnostic Aids

PINPOINT TESTS B through F are intended to diagnose hard faults. Intermittent failures may be difficult to diagnose using these procedures.

EEC-IV Breakout Box (T83L-50-EEC-IV) connected to DIS diagnostic cable is referred to as breakout box or DIS breakout box. If a second breakout box is connected to ECA vehicle harness connector, it will be referred to as second breakout box or ECA breakout box. This setup allows testing of DIS components and vehicle harness circuits.

Circuits are identified in all capitals, for example: IGND = Ignition Ground. Manufacturers breakout box overlay is identified by a J prefix, for example: J2 (IGND D). This indicates test terminal number and circuit identification.

Fig 1: DIS Diagnostic Cable & Component Locations (Mustang 2.3L)

Fig 2: DIS System Pin Voltages Chart (Mustang 2.3L)

Fig 3: DIS System Wiring Diagram (Mustang 2.3L)

Fig 4: DIS Signal Diagram (Mustang 2.3L)