Ford vehicle no start problem and troubleshooting?

Diagnosis and Testing

• SERVICE PRECAUTIONS
• PRELIMINARY CHECKS
• GENERAL SYSTEM TEST

SERVICE PRECAUTIONS

Always turn the ignition key OFF and isolate both ends of a circuit whenever testing for shorts or continuity.

Never measure voltage or resistance directly at the processor connector.

Always disconnect solenoids and switches from the harness before measuring for continuity, resistance or energizing by way of a 12-volt source.

When disconnecting connectors, inspect for damaged or pushed-out pins, corrosion, loose wires, etc. Service if required.

PRELIMINARY CHECKS

1. Visually inspect the engine compartment to ensure that all vacuum lines and spark plug wires are properly routed and securely connected.
2. Examine all wiring harnesses and connectors for insulation damage, burned, overheated, loose or broken connections.
3. Be certain that the battery is fully charged and that all accessories areOFF during the diagnosis.

GENERAL SYSTEM TEST

See Figures 1 through 12

This is a general system test for a no-start condition. Use the accompanying flow charts for this test. For ignition coil testing refer to the ignition coil procedures.

Most Digital Volt Ohmmeters (DVOMs) used today belong to a class referred to as "averaging." Some averaging DVOMs include the Rotunda® 007-00001, the Fluke® 70, 20 series and the Fluke® 88. Recently a new class of DVOMs, referred to as True RMS DVOMs (such as: the Fluke® 87, 8060A, 8062A, etc.), are being used. True RMS DVOMs should not be used for the tests presented here. They may display different voltage readings depending on whether the DVOM is first turned on and then the test leads are attached, or if the leads are attached first, then the DVOM is turned on. Also they may not auto range to the same range during each test, and some show different values depending on the range selected.

Fig. Fig. 1: Test A-no start, part 1

Fig. Fig. 2: Test A-no start, part 2

Fig. Fig. 3: Test A-no start, part 3

Fig. Fig. 4: Test A-no start, part 4

Fig. Fig. 5: Test A-no start, part 5

Fig. Fig. 6: Test A-no start, part 6

Fig. Fig. 7: Test A-no start, part 7

Fig. Fig. 8: Test B-code 16, memory code 18 and/or "Check Engine Light On" IDM failure

Fig. Fig. 9: Test C-memory code 45 and/or "Check Engine Light On" coil failure, part 1

Fig. Fig. 10: Test C-memory code 45 and/or "Check Engine Light On" coil failure, part 2

Fig. Fig. 11: Test D-engine running with code 18, SAW failure, part 1

Fig. Fig. 12: Test D-engine running with code 18, SAW failure, part 2

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