Diagnostic Aids

Perform this test when checking computed timing or if directed by QUICK TEST . This test is intended to diagnose:

SPOUT wiring harness circuit.
Base timing.
Faulty ECA.

To prevent replacing good components, be aware following non-EEC related areas may be at fault:

Basic engine condition (valves, vacuum leaks, valve timing, etc.).
DIS module.
Camshaft sensor.
Crankshaft sensor.

Fig 1: DIS Module Harness Connector Term. ID (Mustang 2.3L OHC)

Fig 2: DIS Module Harness Connector Term. ID (3.0L SHO & 3.8L SC)

TEST PIN NO. 16 (IGN GND) WIRE COLOR ID

Application	Wire Color
Except Thunderbird 3.8L SC	Orange/Red
Thunderbird 3.8L SC	Light Blue

1) Check For Power To ECA Turn ignition off. Disconnect 60-pin ECA connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Turn ignition on. Measure voltage between test pins No. 37 and 40 and between test pins No. 57 and 60 at breakout box. If either reading is less than 10.5 volts, go to CIRCUIT TEST X. If both readings are 10.5 volts or more, go to step 2).

2) Check SPOUT Circuit For Continuity Turn ignition off. Disconnect DIS module wiring harness connector (pins No. 1-6). Measure resistance between test pin No. 36 at breakout box and SPOUT terminal at DIS module wiring harness connector. If resistance is more than 5 ohms, repair open circuit and check ignition timing. If resistance is 5 ohms or less, go to step 3).

3) Check SPOUT Circuit For Shorts To Power, Ground & PIP Turn ignition off. Leave ECA and DIS module (pins No. 1-6) wiring harness connector disconnected. To check for shorts to ground, measure resistance between test pin No. 36 and test pins No. 16, 20, 40, 46 and 60 at breakout box. To check for shorts to power, measure resistance between test pin No. 36 and test pins No. 26, 37 and 57 at breakout box. To check for shorts to PIP circuit, measure resistance between test pins No. 36 and 56 at breakout box. If resistance is 10,000 ohms or less, repair short circuit and repeat QUICK TEST . If each resistance is more than 10,000 ohms, go to step 4).

4) Check SPOUT Voltage At ECA Turn ignition off. Connect ECA to breakout box. Reconnect DIS module. Ensure timing switch on breakout box is in DIST position. Set DVOM on 20-volt AC scale. Start engine. Measure voltage between test pin No. 36 and negative battery terminal. If AC voltage is not 3-12 volts, replace ECA and repeat QUICK TEST . If AC voltage is 3-12 volts, EEC-IV system is okay. Check ignition system. See IGNITION SYSTEMS in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted.

10) Continuous Memory Code 219: Check SPOUT Circuit Continuity Code 219 indicates ignition timing has defaulted to 10 degrees BTDC. SPOUT signal has a variable duty cycle, with voltage varying from 0.4 volt to battery voltage. In event of a SPOUT failure, DIS module will generate a fixed dwell and constant spark angle, based on CID and PIP signals (FMEM mode). Possible causes for this fault are:

Faulty DIS module.
Faulty SPOUT circuit.

Turn ignition off. Disconnect 60-pin ECA connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Disconnect DIS module (pins No. 1-6). Measure resistance between test pin No. 36 at breakout box and SPOUT terminal at DIS module harness connector. If resistance is 5 ohms or less, go to step 11). If resistance is more than 5 ohms, check SPOUT in-line connector. If connector is okay, repair open circuit and repeat QUICK TEST .

11) Check SPOUT For Short To Power & Ground Turn ignition off. Leave ECA and DIS module disconnected. Measure resistance between test pin No. 36 and test pins No. 16 and 40 at breakout box. Measure resistance between test pin No. 36 and postive battery terminal. If resistance is 10,000 ohms or less, repair short circuit and repeat QUICK TEST . If each resistance is more than 10,000 ohms, EEC system is okay. Check ignition system. See IGNITION SYSTEMS in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.