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Diagnostic Aids

Perform this test when directed by QUICK TEST  . This test is only intended to diagnose EEC-IV portion of ignition system. For additional information on ignition system and component testing, see I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. To prevent replacing good components, be aware following non-EEC related areas may be cause of problem:

This test is intended to diagnose:

Fig 1: IDM Circuit Schematic (Mustang 2.3L)
G91I09212
Fig 2: IDM Ckt. Schematic (Taurus 3.0L SHO & Thunderbird 3.8L SC)
G91A09213
TEST PIN NO. 4 (IDM) WIRE COLOR ID

Application Wire Color
Taurus 3.0L SHO Gray/Orange
Thunderbird 3.8L SC Tan/Yellow
DIS MODULE LOCATION

Application Location
Mustang 2.3L Lower Left Intake Manifold
Taurus 3.0L SHO Right Side Of Intake Manifold
Thunderbird 3.8L SC A/C Compressor Bracket

1) Continuous Memory Code 14/211: Erratic Ignition  Code 14/211 indicates 2 successive erratic Profile Ignition Pick-Up (PIP) pulses occurred. Possible causes for this fault are:

Repair any problems found as necessary. Clear code, and repeat QUICK TEST  . If problem is not found, go to step 4).

2) Continuous Memory Code 18/212: Check For Other Codes  Continuous Memory Code 18/212 indicates loss of IDM input signal to ECA. Possible causes for this fault are:

If Continuous Memory Code 215, 216 or 217 is present, go to IGNITION SYSTEMS in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. If Code 215, 216 or 217 is not present, go to step 3).

3) Continuous Memory Code 212, 218 Or 222  Code 212 indicates loss of IDM input signal. Possible causes are:

Code 222 indicates IDM input signal is always low. Possible causes are:

Code 218 indicates IDM input signal is always high. Possible causes are:

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 connector (pins No. 7-12). Measure resistance between test pin No. 4 at breakout box and DIS module wiring harness connector pin No. 12. If resistance is 5 ohms or less, go to step 4). If resistance is more than 5 ohms, repair open circuit. Clear codes, and repeat QUICK TEST  .

4) Check IDM Circuit For Short To Power  Turn ignition off. Disconnect DIS module connector (pins No. 1-6). Leave ECA disconnected from breakout box. On 3.0L and 3.8L, disconnect camshaft sensor. On all models, turn ignition on. Measure voltage between test pin No. 4 and test pins No. 40 and 60 at breakout box. If voltage is less than 10.5 volts, go to step 5). If voltage is 10.5 volts or more, repair short circuit.

5) Check IDM Circuit For Short To VREF & PIP  Turn ignition off. Ensure DIS module (pins No. 1-6) and camshaft sensor (if equipped) are disconnected. Check VREF circuit by measuring resistance between test pins No. 4 and 26. Check PIP circuit by measuring resistance between test pins No. 4 and 56. If either resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST  . If each resistance is 10,000 ohms or more, go to step 6).

6) Check IDM Circuit For Short To Ground  Turn ignition off. Disconnect DIS module connector (pins No. 7-12). Leave ECA disconnected from breakout box. Measure resistance between test pin No. 4 and test pins No. 16, 20, 40, 46 and 60 at breakout box. If any resistance is less than 10,000 ohms, repair short to ground and repeat QUICK TEST  . If each resistance is 10,000 ohms or more, go to step 7).

7) Check DIS Module  Turn ignition off. Connect DIS module to wiring harness connector. Connect ECA to breakout box. Start engine, and allow it to idle. Connect positive lead of DVOM to test pin No. 4 and negative lead to test pin No. 16. On 2.3L OHC, also connect positive lead of DVOM to test pin No. 4 and negative lead to test pin No. 32. On all models, observe DVOM for voltage surge (fault) while lightly tapping on ignition components to simulate road shock. Wiggle all DIS harness connectors. If fault is not indicated, disconnect and inspect DIS wiring harness connectors and terminals for damage. If connectors and terminals are okay, check ignition system. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. If fault is indicated, leave DVOM connected to breakout box and go to step 8).

8) Check EEC-IV Harness  Ensure engine is idling at correct RPM. Wiggle, shake or bend small sections of harness, working from DIS connectors to firewall. Observe DVOM for indication of fault. Repeat process from firewall to ECA. If fault is indicated, isolate fault and repair wiring harness. Repeat QUICK TEST  . If no fault is indicated, go to step 9).

9) Check ECA & Harness Connectors  Turn ignition off. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. If connector is damaged, repair as necessary. Clear codes, and repeat QUICK TEST  . If connector is okay, go to step 10).

10) Check ECA For Short To Ground  Turn ignition off. Disconnect DIS module connector (pins No. 7-12). Connect ECA to breakout box. Measure resistance between test pin No. 4 and pins No. 40, 46 and 60. If each resistance is more than 10,000 ohms, check ignition system. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. If any resistance is 10,000 ohms or less, replace ECA and repeat QUICK TEST  .

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 20). No test procedures have been omitted.

20) Continuous Memory Code 223 (2.3L OHC)  Code 223 indicates open in Dual Plug Inhibit (DPI) circuit or open or short to ground in coil No. 4. Possible causes for this fault are:

Turn ignition off. Disconnect DIS connector (pins No. 1-6). Disconnect 60-pin ECA connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Measure resistance between pin No. 6 at DIS vehicle harness connector and test pin No. 32 at breakout box. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST  . If resistance is less than 5 ohms, check ignition system. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. If ignition system is okay, replace ECA.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 20) to step 25). No test procedures have been omitted.

25) Hard To Start: Check For Spark During Crank  Use spark tester to check for spark at all spark plug wires while cranking engine. If spark is present and consistent, go to step 26). If spark is not present or if spark is inconsistent, replace spark plug or spark plug wire and repeat QUICK TEST  .

26) Hard To Start: Check DPI Circuit  Turn ignition off. Disconnect DIS module (pins No. 1-6). Disconnect 60-pin ECA connector. Inspect terminals. Repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving ECA disconnected. Measure resistance between test pin No. 32 and test pins No. 40 and 60 at breakout box. If resistance is 100,000 ohms or less, repair short circuit and repeat QUICK TEST  . If resistance is more than 100,000 ohms, go to step 27).

27) Check ECA For Short To Ground  Turn ignition off. Connect ECA to breakout box. Measure resistance between test pin No. 32 and test pins No. 40 and 60 at breakout box. If resistance is 500 ohms or less, replace ECA and repeat QUICK TEST  . If resistance is more than 500 ohms, check ignition system. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.

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