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Retrieving Codes
KOER SELF TEST (EEC-IV SYSTEMS)
Chapter 4 32
■ Turn the engine off and disconnect the Code Reader
from the test connectors. Refer to the vehicle's service
manual for instructions on adjusting and/or repairing
ignition timing.
9. If timing light readings are within the acceptable range,
base timing and the vehicle's computer ability to advance
timing are working properly.
■ Turn engine off and disconnect the Code Reader from
test connectors. Proceed to page 32 and perform the
KOER Self Test.
B. Timing Procedures for 1993 And Newer Vehicles (excluding
diesel engines)
Due to the complexity and large variation of Ford 1993 and
newer models with computer-controlled ignition timing
systems, timing adjustment and/or checking procedures vary
widely from one model to the next. Refer to the vehicle’s service
manual for procedures to check and adjust timing. DO NOT
ATTEMPT TO ADJUST TIMING WITHOUT MANUFAC-
TURER’S SPECIFICATIONS AND PROCEDURES.
KEY ON ENGINE RUNNING (KOER) SELF TEST
(EEC-IV SYSTEMS)
IMPORTANT:
•
The KOEO Self Test (page 25) must be performed first, and
a “pass code” (code 11 or 111) must be obtained before
performing the KOER Self Test; otherwise, results of the
KOER Self Test may be invalid.
•
Ignition timing and timing advance must be operating
properly in order for the KOER Self Test results to be
considered valid. Perform an Ignition Timing Check (page
31) before performing the KOER Self Test.
•
Always observe all safety precautions before and during
the testing process.
•
ALWAYS check the code reader's batteries before the test.
4
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