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Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - ENGINE TIMING CHECK
OBD1 77
7. When instructed by the message on the Scan Tool's display, start
the engine and press the ENTER
button.
„
A "One moment please preparation for
test is in progress” message shows
temporarily on the Scan Tool's LCD
display, followed by the message
"Perform Timing Check within two
minutes."
8. When "Perform Timing Check within 2
minutes" displays, perform the Timing
Check as follows:
„ The vehicle's computer is programmed
to advance ignition timing 20° (±3°)
above the vehicle's "base timing" value,
and to freeze this setting for two
minutes from the time the "Perform
Timing Check within 2 minutes"
message displays. This allows the user
to check the computer's ability to
advance ignition timing.
„ Within this two-minute period, follow instructions in the vehicle's
service repair manual to check the ignition timing with a timing
light and ensure that it is 20° above the specified base timing
value (±3°).
Example: If base timing specification is 10° BTDC, the acceptable
timing light reading should be in the range of 27° to 33° BTDC.
Base-timing specifications can be found on the Vehicle
Emission Control Information (VECI) decal. The decal is
located under the hood or near the radiator. If the VECI decal
is missing or damaged, refer to your vehicle's service repair
manual for specifications.
9. If timing light readings are within the acceptable range:
„ Base timing and the vehicle computer's ability to advance timing
are working properly.
„
Proceed to the KOER Self-Test below.
10. If timing light readings are not within the acceptable range:
„
Base timing may be out of adjustment, or the computer may
have problems with the timing advance circuit.
„ Refer to the vehicle's service repair manual for procedures on
adjusting and/or repairing ignition timing. Repairs to ignition
timing must be made before proceeding to the KOER Test.