Engine Control System & Engine Component Tests - 7.5L Eec-Iv: Diagnosis Ford Pickup F350

Test Equipment

Following test equipment should be used in DI system tests.

1. Spark Tester (D81P-6666-A Or D89P-6666-A)
2. Digital Volt-Ohmmeter (DVOM)
3. 12-Volt Test Light
4. Remote Starter Switch
5. EEC-IV Diagnostic Cable (007-00097)
6. EEC-IV Breakout Box (T83L-50-EEC-IV)
7. Inductive Timing Light

Diagnostic Aids

PINPOINT TESTS A, B and C are intended to diagnose hard faults. Intermittent failures may be difficult to diagnose using these procedures. See PINPOINT TEST E for intermittent diagnosis. Following information should be noted during testing

1. All voltage readings given in test procedures are based on values obtained using a standard DVOM such as Rotunda (007-00001) or Fluke (20 or 70 Series). To ensure actual A/C voltage readings taken are consistent with A/C voltage readings in PINPOINT TESTS, DO NOT use a RMS type meter (such as Fluke 8060a).
2. When instructed to inspect a wiring harness, perform both a visual inspection and a continuity test.
3. When making voltage checks, ground connections should be made at negative battery terminal or cast iron surface of engine.
4. When making measurements on a wiring harness or connector, perform a wiggle test while measuring.
5. When making voltage checks, ground readings are defined as a value of less than 1.0 volt. Battery voltage is defined as a value of more than 10 volts.
6. Circuits are identified in all capital letters; for example: PIP. Manufacturer's breakout box overlay test terminals are identified by a "J" prefix; for example: J15 (PIP). This indicates test terminal number and circuit identification.
7. Test procedures are intended to identify faulty components or wiring while fault present. If complaint is an intermittent condition, refer to the «TESTS W/O CODES - 7.5L EEC-IV»(ref-23637) article.

Note. Start all diagnostics with QUICK TEST. See procedures in TESTS W/CODES - 7.5L EEC-IV article. Following tests are dependent on results and diagnostic trouble codes received during QUICK TEST.

DISTRIBUTOR IGNITION PINPOINT TEST INDEX

Distributor Ignition System Wiring Diagram. Scheme 413

PINPOINT TEST A: NO START

1. 18) Check For SPOUT In Harness If engine starts in this step, continue testing. Turn diagnostic cable switch to SPOUT OPEN position. Measure voltage between J7 (B-) and J10 (SPOUT) while cranking engine. If AC voltage is 3.0-8.5 volts, replace ICM. If AC voltage is not 3.0-8.5 volts, go to next step.
2. 19) Check For SPOUT Circuit Voltage Turn ignition off. Disconnect diagnostic cable from ICM. Leave diagnostic cable attached to ICM wiring harness connector. Turn diagnostic cable switch to NORMAL position. Set DVOM to DC voltage scale. Turn ignition on. Measure voltage between J7 (B-) and J10 (SPOUT). If voltage is 0.5 volt or more, go to next step. If voltage is less than 0.5 volt, go to step 21).
3. 20) Check For Short To Power In SPOUT Turn ignition off. Disconnect PCM. Turn ignition on. Measure voltage between J7 (B-) and J10 (SPOUT). If voltage is less than 0.5 volt, go to step 23). If voltage is 0.5 volt or more, repair shorted SPOUT circuit between PCM and ICM.
4. 21) Check For Short To Ground In SPOUT Turn ignition off. Measure resistance between J7 (B-) and J10 (SPOUT). If resistance is 10,000 ohms or less, go to next step. If resistance is more than 10,000 ohms, go to step 23).
5. 22) Check For Short To Ground In SPOUT Harness Disconnect PCM. Measure resistance between J7 (B-) and J10 (SPOUT). If resistance is still 10,000 ohms or less, repair shorted SPOUT circuit between PCM and ICM. If resistance is more than 10,000 ohms, go to next step.
6. 23) Check For Open PIP Turn ignition off. Disconnect PCM. Set DVOM to AC voltage scale. Crank engine and measure voltage between J7 (B-) and J56 (SPOUT). If AC voltage is not 3.0-8.5 volts, go to step 26). If AC voltage is 3.0-8.5 volts, go to next step.
7. 24) Check IGN GND At PCM Turn ignition off. Reconnect diagnostic cable to ICM. Measure resistance between breakout box test pin J7 (B-) and PCM wiring harness connector terminal No. 16 (IGN GND). If resistance less than 5 ohms, replace PCM. If resistance 5 ohms or more, go to next step.
8. 25) Check IGN GND At CMP Sensor Connect diagnostic cable to CMP sensor and sensor wiring harness connector. Measure resistance between J7 (B-) and J35 (IGN GND). If resistance is less than 5 ohms, repair open IGN GND circuit between PCM and CMP sensor. If resistance is 5 ohms or more, repair IGN GND wire or replace CMP sensor (open circuit inside CMP sensor).
9. 26) Check PIP At CMP Sensor Turn diagnostic cable switch to PIP OPEN position. Connect diagnostic cable between CMP sensor and sensor wiring harness connector. Crank engine and measure voltage between J7 (B-) and J34 (PIP A). If AC voltage is 3.0-8.5 volts, repair PIP circuit between CMP sensor and PCM. If AC voltage is not 3.0-8.5 volts, repair PIP wire or replace CMP sensor (open circuit inside CMP sensor).
10. 27) Check COIL- For Open In Harness Turn ignition off. Disconnect diagnostic cable from ICM. Leave diagnostic cable attached to ICM wiring harness connector. Disconnect diagnostic cable from positive battery cable. Measure resistance between J3 (COIL-) and J4 (COIL-). If resistance is 5 ohms or more, repair open COIL- circuit between ignition coil and ICM. If resistance is less than 5 ohms, go to next step.
11. 28) Check COIL- For Short To Power Turn ignition on. Measure voltage between J3 (COIL-) and J7 (B-). If DC voltage is less than 5.5 volts, go to next step. If DC voltage is 5.5 volts or more, repair short to power in COIL- circuit between coil and ICM. Coil may also be damaged.
12. 29) Check COIL- For Short To Ground Turn ignition off. Measure resistance between J3 (COIL-) and J7 (B-). If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short to ground in COIL- circuit between coil and ICM.
13. 30) Check GND At ICM Measure resistance between J9 (GND) and J7 (B-). If resistance is less than 5 ohms, replace ICM. If resistance is 5 ohms or more, go to next step.
14. 31) Check GND At CMP Sensor Connect diagnostic cable between CMP sensor and sensor wiring harness connector. Measure resistance between J7 (B-) and J28 (GND). If resistance is less than 5 ohms, repair open GND circuit between CMP sensor and ICM. If resistance is 5 ohms or more, check ground circuit. If ground circuit is okay, replace CMP sensor.

PINPOINT TEST B: NO START WITH SPOUT CONNECTOR DISCONNECTED

Turn ignition on. Set DVOM to AC voltage scale. Crank engine while measuring voltage between J15 (PIP) and J7 (B-). If AC voltage is 3.0-8.5 volts, replace ICM. If AC voltage is not 3.0-8.5 volts, go to next step.

4) Check PIP Signal From PIP Sensor Connect diagnostic cable to CMP sensor and sensor connector. Turn switch to PIP OPEN position. Crank engine and measure voltage between J7 (B-) and J34 (PIP). If AC voltage is 3.0-8.5 volts, repair open PIP circuit between ICM and CMP sensor. If AC voltage is not 3.0-8.5 volts, check CMP wiring harness connector. Repair as necessary. If connector is okay, replace CMP sensor.

PINPOINT TEST C: CONTINUOUS MEMORY CODE 212

PINPOINT TEST D - KOER CODE 213: TIMING INCORRECT, SPOUT OPEN, POOR FUEL ECONOMY OR POOR DRIVEABILITY

Use this pinpoint test to diagnose an intermittent engine stall but restarts complaint. Visually inspect engine compartment to ensure all vacuum hoses and spark plug wires are properly routed and securely connected. Inspect wiring harnesses and connectors for damaged pins, corrosion and loose wires. If possible, talk to driver of vehicle to determine under what conditions problem occurs. Review vehicle service records to avoid repeat replacement of components.

1. An engine analyzer is used to diagnose problems in secondary side of ignition system.
2. Visually inspect engine compartment to ensure vacuum hoses and spark plug wires are properly routed and securely connected.
3. Examine all wiring harnesses and connectors for insulation damage and burned, overheated, loose and broken conditions.
4. Ensure battery is fully charged and all accessories are turned off during testing.
5. Use an engine analyzer or lab scope and EI Adapter (Rotunda 007-00044) in these testing procedures. Check If Engine Will Start If engine starts, go to next step. If engine does not start, check ignition coil for damage or carbon tracking. Also, check coil wire resistance. Resistance should be 7000 ohms or less per foot. Repair as necessary. If coil and wire are okay, go to the «DISTRIBUTOR IGNITION PINPOINT TEST INDEX»(ref-23717-S27320669302001010300000) table. Viewing Ignition System Secondary Display Connect engine analyzer to view parade display of ignition system secondary. While slowly increasing engine speed from idle to 2000 RPM, compare engine analyzer display to illustrations. (Scheme 414) Illustrations shown are for a 4-cylinder engine but are typical for all EI engines.

Identifying EI Secondary Voltage Scope Patterns. Scheme 414

Perform the following.

1. Visually inspect engine compartment to ensure vacuum hoses and spark plug wires are properly routed and securely connected.
2. Examine all wiring harnesses and connectors for insulation damage and burned, overheated, loose and broken conditions.
3. Ensure battery is fully charged and all accessories are turned off during testing.
4. Use Rotunda Distributor System Tester (007-00075) or equivalent in these testing procedures. Tester must be equipped with a Computer Controlled Dwell (CCD) upgrade to perform tests.

PINPOINT TEST G - COIL TEST

PINPOINT TEST H - IGNITION DIAGNOSTIC MONITOR (IDM) TEST

PINPOINT TEST J -PROFILE IGNITION PICKUP (PIP) TEST

PINPOINT TEST M - SPARK OUTPUT (SPOUT) TEST

PINPOINT TEST N -ICM PWR TEST

See also:
• WIRING DIAGRAMS - 7.5L
• SENSOR RANGE CHARTS - 7.5L
• FUEL PRESSURE SPECIFICATIONS