Ignition Coil; Testing - Ford Ranger Maintaince And Repair Manual

Spark Timing Advance Test
Spark timing advance is controlled by the EEC system. This procedure checks the capability of the ignition
module to receive the spark timing command from the EEC module. The use of a volt/ohmmeter is required.
1. Turn the ignition switch OFF.
2. Disconnect the pin−in−line connector (SPOUT connector) near the TFI module.
3. Start the engine and measure the voltage, at idle, from the SPOUT connector to the distributor base.
The reading should equal battery voltage.
4. If the result is okay, the problem lies within the EEC−IV system.
5. If the result was not satisfactory, separate the wiring harness connector from the ignition module.
Check for damage, corrosion or dirt. Service as necessary.
6. Measure the resistance between terminal No. 5 and the pin−in−line connector. This test is done at the
ignition module connector only. The reading should be less than 5 ohms.
7. If the reading is okay, replace the TFI module.
8. If the result was not satisfactory, service the wiring between the pin inline connector and the TFI
connector.

Ignition Coil

TESTING

Ignition Coil and Secondary Wire
1. Disconnect the ignition coil connector and check for dirt, corrosion or damage.
2. Substitute a known−good coil and check for spark using the spark tester.
Dangerous high voltage may be present when performing this test. Do not hold the coil while
performing this test.
TEST PROCEDURES
HOW TO USE THIS BOOK
Schematic of the TFI−IV ignition system
Click to enlarge
177