Engine Controls - Basic Diagnostic Procedures - Trucks - Diesel: Other Ford Excursion I

Exhaust System Backpressure

Connect scan tool. Start and run engine until a temperature of 170°F (77°C) is reached. Disconnect engine oil temperature sensor. Run engine at wide open throttle and monitor EBP PID on scan tool. If pressure exceeds 34 psi (234 kPa) at 3400 RPM, exhaust system is restricted.

PRELIMINARY CHECKS

Ensure following systems and components are in good condition and operating properly before diagnosing problems in fuel injection system

1. Check battery and charging system condition.
2. Check all wiring and vacuum connections.
3. Check air cleaner and ducting.
4. Check state of tune.
5. Check fuel delivery system.
6. Check cooling system.
7. Check Inertia Fuel Shutoff (IFS) switch.
8. Check for blown head gasket (liquid in cylinder).
9. Check fuel tank contents and fuel gauge accuracy.
10. Check for dirt, water or other contamination in fuel.
11. Check fuel lines and fittings for leaks.
12. Check fuel delivery system for proper pressure and volume.
13. Check for inoperative fuel injectors.
14. Check for improperly installed electronic equipment such as anti-theft system, CB radio, cellular telephone or stereo.

Engine Does Not Crank

Check for enabled anti-theft system. Check starting and charging system for correct operation. Check for hydrostatic lock (liquid in cylinder). Repair as necessary.

Engine Cranks But Will Not Start

1. Check fuel tank contents and fuel gauge accuracy. Check for dirt, water or contamination in fuel.
2. Check fuel lines and fittings for leaks. If no leaks are found, check fuel delivery system for proper pressure and volumes. Reset Inertia Fuel Shutoff (IFS) switch (if necessary).
3. Check for damaged or contaminated fuel injector wiring harness and connector. Ensure fuel injectors pulse when engine is cranked.
4. Check glow plug system. See appropriate SYSTEM TEST in SELF-DIAGNOSTICS - EEC-V - DIESEL article.

FUEL SYSTEM PRESSURE RELEASE

FUEL PRESSURE

Electric Fuel Pump Inlet Restriction

1. Ensure fuel tank has fuel. Ensure fuel pump has power and ground. With ignition on, battery voltage should be present at fuel pump for about 20 seconds. If voltage is as specified, go to next step. If voltage is not as specified, perform TEST FK: FUEL PUMP MONITOR CONTROL under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - DIESEL article.
2. Remove fuel line to inlet side of fuel pump. Install Fuel Pressure Adapter (014-00931-2) between fuel inlet line and fuel pump. Connect fuel pressure adapter to vacuum gauge (0-30 in. Hg) of Engine Pressure Tester (014-00761).
3. Measure restriction at wide open throttle with shift lever in Neutral, brakes set and wheels blocked. If restriction measures more than 6 in. Hg, a blockage exists between fuel pump and fuel tank.

FUEL INJECTORS

Fuel Injector Checks

Fuel injector resistances are not available. For injector and injector circuit tests, see KOEO INJECTOR ELECTRICAL SELF-TEST under QUICK TEST in SELF-DIAGNOSTICS - DIESEL article.

INERTIA FUEL SHUTOFF SWITCH

1. In event of a collision, electrical contacts in inertia switch open, automatically shutting off fuel pump. Fuel pump shuts off even if engine does not stop running. Engine will stop due to lack of fuel.
2. Engine cannot be restarted until IFS switch is manually reset. To reset IFS switch, depress button on switch located behind right kick panel.

1. Visual engine and chassis inspection. Loose or leaking fuel supply lines. Kinked or blocked fuel supply lines. Massive fuel or oil leaks. Coolant leaks. Electronic connectors and wiring (particularly camshaft position and injection pressure regulator). Pinched or open MAP sensor hose. Pinched or open intercooler hose.
2. Check engine oil level.
3. Check for intake or exhaust restriction.
4. Check for sufficient and clean fuel.
5. Check electric fuel pump pressure. See «FUEL PRESSURE»(ref-141920-S09388805122002071100000) .
6. Perform KOEO ON-DEMAND SELF-TEST. See «KOEO ON-DEMAND SELF-TEST»(ref-139800-S08685095592002050900000) under QUICK TEST in SELF-DIAGNOSTICS - EEC-V - DIESEL.
7. Retrieve Continuous Memory DTCs. See «RETRIEVE/CLEAR CONTINUOUS MEMORY DTCS»(ref-139800-S16760289892002050900000) under QUICK TEST in SELF-DIAGNOSTICS - EEC-V - DIESEL.
8. Perform KOEO INJECTOR ELECTRICAL SELF-TEST. See «KOEO INJECTOR ELECTRICAL SELF-TEST»(ref-139800-S15778450502002050900000) under QUICK TEST in SELF-DIAGNOSTICS - EEC-V - DIESEL.
9. Using scan tool, monitor: V-PWR Check system voltage. If system voltage is low, check battery, charging system, and powers and grounds at PCM. RPM Low RPM could indicate a starting/charging system problem. No RPM with engine cranking could indicate a faulty CMP circuit. ICP A minimum of 500 PSI is required before injectors are enabled. No or low oil in reservoir, system leakage, injector "O" rings or faulty IPR could cause pressure loss. Fuel PW Even though a 1-6 millisecond fuel pulse width is shown on scan tool to be sent to IDM, it is possible that IDM did not get signal, due to a fault on CID or FDCS circuits or a faulty IDM.
10. Check glow plug system operation. Perform «TEST 10: GLOW PLUG SYSTEM OPERATION»(ref-140379-S20051798802002052200000) under HARD START/NO-START DIAGNOSTIC PROCEDURES in SYSTEM & COMPONENT TESTING - EEC-V - DIESEL article.

INJECTION TIMING

Injection timing is controlled by Camshaft Position (CMP) sensor and not adjustable.

IDLE SPEED

Idle speed is controlled by Powertrain Control Module (PCM) and is not adjustable. If idle concerns exist, see appropriate symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - DIESEL article.

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to SELF-DIAGNOSTIC SYSTEM in SELF DIAGNOSTICS - EEC-V - DIESEL article. If no DTCs are found during self-diagnostics, proceed to TROUBLE SHOOTING - NO CODES - EEC-V - DIESEL article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.