Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - ENGINE TIMING CHECK
94 3160g
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 pro-
grammed 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 igni-
tion 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.
