Eec−V Equipped Engines; Eec−Iv Equipped Engines - Ford Ranger Maintaince And Repair Manual

When using a scan tool, make sure to follow all of the manufacturers instructions carefully to
EEC−V EQUIPPED ENGINES
The EEC−V equipped engines utilize On Board Diagnostic II (OBD−II) Diagnostic Trouble Codes (DTC's),
which are alpha−numeric (they use letters and numbers). The letters in the OBD−II DTC's make it highly
difficult to convey the codes through the use of anything but a scan tool. Therefore, to read the OBD−II DTC's
on these vehicles it is necessary to utilize an OBD−II compatible scan tool.
1. Ensure that the ignition switch is in the OFFposition.
2. Apply the parking brake.
3. Ensure that transmission gearshift is in either Park (automatic transmissions) or Neutral (manual
transmissions).
4. Block the rear wheels.
5. Turn off all electrical loads, such as the heater blower motor, the radio, the rear defroster, etc.
6. Connect the scan tool to the Data Link Connector (DLC−3.8L and 4.6L engines) or the Assembly
Line Diagnostic Link (ALDL−5.0L engine). Make certain the test button on the scan tool is unlatched
or up.
7. Turn the ignition switch to the ONposition without starting the engine (KOEO).
8. Using the scan tool, retrieve and record any continuous memory DTC's.
9. Turn the ignition switch to the OFFposition.
10. Start the engine and run it until normal operating temperature is reached.
11. Turn the engine OFFand wait 10 seconds.
12. Turn the ignition switch ONbut do not start the engine.
13. Activate the KOEO self−test. Retrieve and record any KOEO DTC's after the KOEO test is complete.
Ignore DTC 1000.
14. If any DTC's were present, refer to the accompanying OBD−II charts to locate the problem(s).
EEC−IV EQUIPPED ENGINES
The EEC−IV equipped engines use an older diagnostic system to monitor and report engine related
malfunctions. This older system is known as On Board Diagnostics (OBD−I). The Diagnostic Trouble Codes
584
HOW TO USE THIS BOOK
ensure proper diagnosis
Reading Codes