Diagnostic Aids

Following information should be noted during testing:

When making measurements on a wiring harness, perform both a visual inspection and a continuity test. Inspect terminal connector pins for damage and corrosion when directed to remove a connector.
Spark timing adjustments are not possible. Timing is controlled by EDIS module with input from ECA.
When checking voltage drop to GROUND, circuit must have a voltage drop of less than one volt.
Battery voltage (VBAT) is any voltage reading within 2 volts of actual battery voltage.
Spark timing will vary at idle due to feedback spark strategy used to control idle speed.
DO NOT connect positive lead of EDIS diagnostic cable to battery or connect cable to VR sensor until so directed.
SAW and IDM signal detectors in EDIS diagnostic cable will not work unless diagnostic cable battery leads are connected to battery.
When using DVOM to measure DC voltage, always connect positive lead to breakout box terminal A (+) and negative lead to A (-).
EEC-IV Breakout Box (T83L-50-EEC-IV) connected to EDIS diagnostic cable is referred to as breakout box or EDIS breakout box. If a second breakout box is connected to ECA vehicle harness connector, it will be referred to as second or ECA breakout box. This setup allows testing of EDIS components and vehicle harness circuits.

NOTE: A 12-volt incandescent (high voltage) test light should not be used to test circuit signals. It will load circuit and may cause incorrect measurements or faulty EDIS/ECA operations (engine stall).

1.9L EDIS PINPOINT TEST INDEX

Result

Pinpoint Test & Step

No Start

No Codes

Continuous Memory Code 14/211 (PIP Signal At ECA Fault)

"CHECK ENGINE" Light Stays On During Engine Cranking

Engine Runs

Continuous Memory Code 18/212 (IDM To ECA Circuit Fault)

Continuous Memory Code 45/215 Or 46/216 (Coil Fault)

Continuous Memory Code 18/213 (No System Response To SAW Commands During Self-Test

Engine Miss On Acceleration

⁽¹⁾ *

Engine Miss, Intermittent Stall

⁽²⁾ *

⁽¹⁾	See PINPOINT TEST F under DIS SYSTEM (TAURUS 3.0L SHO & THUNDERBIRD 3.8L SC).

⁽²⁾	Go To PINPOINT TEST G under DIS SYSTEM (TAURUS 3.0L SHO & THUNDERBIRD 3.8L SC).

Fig 1: EDIS Diagnostic Cable Diagram (Escort & Tracer - 1.9L)

Fig 2: EDIS Wiring Diagram (Escort & Tracer - 1.9L)

Fig 3: EDIS Module Pin Voltage Chart (Escort & Tracer - 1.9L)

Fig 4: EDIS Signal Diagram (Escort & Tracer - 1.9L)

WARNING: DO NOT connect ECA to EDIS diagnostic cable; 60-pin connector on this harness may be connected to a Breakout Box (BOB) only. If ECA is connected to EDIS diagnostic cable, ECA may be damaged. Some tests may require a second breakout box to be connected to ECA 60-pin connector. When a second breakout box is used, ECA should be disconnected at all times. Never connect ECA to breakout box when performing EDIS diagnostics.

WARNING: DO NOT bring a fluorescent trouble light (drop light) close to vehicle ignition system wiring. If key is on and VR sensor is disconnected, light may cause EDIS module to fire ignition coil.

NOTE: Steps in pinpoint tests are designed to correct one ignition failure at a time. When a component is replaced or service is completed, remove all test equipment. Reconnect all components, and perform QUICK TEST. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.