Engine Controls - Tests W/codes - 7.3L Diesel - Eec-Iv: Other Ford Pickup F350

RETRIEVING DTCS

DTCs are retrieved from powertrain control system through Data Link Connector (DLC). (Scheme 343) Self-diagnostic test procedures are for use with New Generation Star (NGS) scan tool. If a generic scan tool is used, ensure tool is certified OBD-I standard.

DATA LINK CONNECTOR LOCATIONS

Scheme 343

Injector Driver Module

Note. Special instructions are required to clear IDM DTCs.

Turn ignition on. Record IDM DTCs stored in KOEO SELF TEST and KOEO INJECTOR ELECTRICAL SELF TEST (BUZZ TEST) modes. Using NGS Tester, access RETRIEVE/CLEAR CONTINUOUS DTCs from menu to clear IDM DTCs from memory. Select CLEAR ALL. IDM DTCs are now cleared from memory.

Powertrain Control Module

Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CONTROL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select RETRIEVE/CLEAR CONTINUOUS DTCs.
7. Turn ignition on.
8. Select CLEAR ALL.

All DTCs should now be cleared from PCM memory. If problem has not been corrected or fault is still present, hard DTC will immediately be reset in PCM memory.

Pass Codes

DTC 1111 (system pass) indicates no DTCs were recorded in that portion of test. If DTC 1111 is not retrieved in KOEO SELF-TEST, DTCs retrieved during KOER SELF-TEST may not be valid.

VISUAL CHECK

Perform the following, and make all necessary repairs before continuing with QUICK TEST

1. Inspect air cleaner and inlet ducts.
2. Inspect system wiring harness for proper connections, bent or broken pins, corrosion, loose wires and proper routing.
3. Check Powertrain Control Module (PCM), sensors and actuators for physical damage.
4. Check engine coolant for proper level and mixture.
5. Check transmission fluid level and quality.

VEHICLE PREPARATION & EQUIPMENT HOOKUP

Apply parking brake, and place shift lever in Park (A/T) or Neutral (M/T) position. Block drive wheels. Turn off all electrical accessories. If vehicle is equipped with an auxiliary powertrain control system (RPM control), it must be turned off when performing appropriate self-test. Start engine and bring up to normal operating temperature. Connect appropriate test equipment to vehicle as follows.

Generic Scan Tester

Follow manufacturer's instructions to hook up equipment and record DTCs.

New Generation STAR (NGS) Tester

Turn ignition off. Ensure proper memory (EPROM) card is inserted into NGS tester. Connect service connectors of adapter cable to vehicle Data Link Connector (DLC) and NGS tester. (Scheme 344) Connect NGS tester power supply cable to power and go to KOEO SELF-TEST.

Scheme 344

RETRIEVE/CLEAR CONTINUOUS DTCS

Turn ignition off. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select VEHICLE & ENGINE SELECTION menu.
2. Select NEW VEHICLE, YEAR & MODEL.
3. Select DIAGNOSTIC DATA LINK.
4. Select PCM - POWERTRAIN CONTROL MODULE.
5. Select DIAGNOSTIC TEST MODE.
6. Select RETRIEVE/CLEAR CONTINUOUS DTCs.
7. Turn ignition on.
8. Follow operating instructions from scan tool menu.
9. Record DTCs and perform appropriate pinpoint test. See «DIAGNOSTIC TROUBLE CODE IDENTIFICATION»(ref-23600-S39286360782001010300000) .
10. Continuous Memory DTCs must be cleared after servicing EEC-IV system. See «CLEARING DTCS»(ref-23600-S12329113672001010300000) under SELF-DIAGNOSTIC SYSTEM.
11. After test, cycle ignition off before running other tests or driving vehicle.

ADDITIONAL SYSTEM FUNCTIONS

Note. Additional diagnostic system features are available to help diagnose driveability problems and service EEC-IV systems.

SUMMARY

Note. If no DTC is present but driveability problem still exists, proceed to H - TESTS W/O CODES - 7.3L DIESEL article for symptom diagnosis or intermittent diagnostic procedures.

PINPOINT TESTS

Note. A breakout box, connected to PCM harness connector, is necessary to perform most pinpoint tests. References to Test Pin No. found in PINPOINT TEST steps refer to test terminals on manufacturer's breakout box.

HOW TO USE PINPOINT TESTS

Note. After repairing fault, clear DTCs from memory. Refer to CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM. Intermittent faults may be caused by a sensor, connector or wiring-related problem. Refer to INTERMITTENTS in H - TESTS W/O CODES - 7.3L DIESEL article.

1. Ensure all non-EEC related faults found while performing steps in the F - BASIC TESTING - 7.3L DIESEL article have been corrected. DO NOT perform any PINPOINT TEST unless specifically instructed by a «QUICK TEST»(ref-23600-S06329863082001010300000) procedure or a DTC reference chart. Follow each test step in order until fault is found. DO NOT replace any part unless directed to do so. When more than one DTC is retrieved, start with first DTC displayed.
2. PINPOINT TESTS ensure electrical circuits are okay before sensors or other components are replaced. Always test circuits for continuity between sensor and PCM. Test all circuits for short to power, opens or short to ground. Voltage Reference (VREF) and Voltage Power (VPWR) circuits should be tested with ignition on or as specified in PINPOINT TESTS.
3. DO NOT measure voltage or resistance at PCM. DO NOT connect any test light unless specified in testing procedure. All measurements are made by probing rear of connector (wiring harness side). Isolate both ends of a circuit and turn ignition off when checking for shorts or continuity, unless instructed otherwise.
4. Disconnect solenoids and switches from harness before measuring continuity and resistance or applying voltage. After each repair, check all component connections and repeat «QUICK TEST»(ref-23600-S06329863082001010300000) .
5. An open circuit is defined as a resistance reading of more than 5 ohms. This specification tolerance may be too high for some items in EEC-IV system. If resistance approaches 5 ohms, always clean suspect connector and coat it with protective dielectric silicone grease. A short is defined as a resistance reading of less than 10 k/ohms to ground, unless stated otherwise in PINPOINT TEST.

CHECK ENGINE Light Functionality

CHECK ENGINE light is located in instrument cluster and is amber colored. CHECK ENGINE light functions in one of 3 modes

1. Bulb Check With ignition-on, CHECK ENGINE light is illuminated for a short duration as a bulb check. If this does not occur, check wiring, bulb, and associated fuse.
2. Detection Of Certain Concerns CHECK ENGINE light is used to indicate that one of certain concerns has been detected by PCM or IDM. Only those concerns which result in a change in power output available from engine will cause CHECK ENGINE light to be illuminated. Examples of such concerns are: Injector low side short to ground - PCM will turn off 4 of the cylinders to prevent engine damage. Accelerator pedal sensor out of range - PCM will allow engine to idle only.

Detection/Management

Note. Special instructions are required to clear IDM DTCs on 1995-96 models.

1. Turn ignition on.
2. Record IDM DTCs stored in KOEO SELF-TEST and KOEO INJECTOR ELECTRICAL SELF-TEST (BUZZ TEST) modes.
3. Access RETRIEVE/CLEAR CONTINUOUS DTCs from NGS Tester menu to clear IDM DTCs from memory.
4. Record any DTCs displayed. (1111 may be the only DTC displayed.)
5. Push CLEAR ALL button on NGS Tester.

IDM DTCs are now cleared from memory. Repeat KOEO SELF TEST and KOEO INJECTOR ELECTRICAL SELF-TEST (BUZZ TEST) . Any IDM DTCs that reappear are IDM hard faults. If no IDM DTCs reappear, then fault is an intermittent IDM fault. IDM is capable of detecting individual injector open and shorts to either ground or battery while engine is running. It is also capable of detecting right or left bank high side opens or shorts to ground. A special on-demand buzz electrical self test will also allow operator to enable all injector solenoids while engine is off to verify circuit operation. IDM detected DTCs will not be transmitted if EF line is not functioning; however, engine will not shut down due to a non-functional EF line. If a low side short to ground condition is determined by IDM, this condition will be transmitted to PCM via EF signal. PCM will enable CHECK ENGINE light and command minimum fuel to affected bank.