You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Ford OBD1 Systems<br />
CODE RETRIEVAL PROCEDURES - ENGINE TIMING CHECK<br />
7. When instructed by the message on the Tool's display, start the<br />
engine and press the ENTER button.<br />
� A "One moment please preparation<br />
for test is in progress” message<br />
shows temporarily on the Tool's<br />
LCD display, followed by the<br />
message "Perform Timing Check<br />
within two minutes."<br />
8. When "Perform Timing Check within 2<br />
minutes" displays, perform the Timing<br />
Check as follows:<br />
� The vehicle's computer is programmed<br />
to advance ignition timing<br />
20° (±3°) above the vehicle's "base<br />
timing" value, and to freeze this<br />
setting for two minutes from the time<br />
the "Perform Timing Check within 2<br />
minutes" message displays. This<br />
allows the user to check the<br />
�<br />
computer's ability to advance ignition<br />
timing.<br />
Within this two-minute period, follow instructions in the vehicle's<br />
service repair manual to check the ignition timing with a timing<br />
light and ensure that it is 20° above the specified base timing<br />
value (±3°).<br />
Example: If base timing specification is 10° BTDC, the acceptable<br />
timing light reading should be in the range of 27° to 33° BTDC.<br />
Base-timing specifications can be found on the Vehicle<br />
Emission Control Information (VECI) decal. The decal is<br />
located under the hood or near the radiator. If the VECI decal<br />
is missing or damaged, refer to your vehicle's service repair<br />
manual for specifications.<br />
9. If timing light readings are within the acceptable range:<br />
� Base timing and the vehicle computer's ability to advance timing<br />
are working properly.<br />
� Proceed to the KOER Self-Test below.<br />
10. If timing light readings are not within the acceptable range:<br />
� Base timing may be out of adjustment, or the computer may<br />
have problems with the timing advance circuit.<br />
� Refer to the vehicle's service repair manual for procedures on<br />
adjusting and/or repairing ignition timing. Repairs to ignition<br />
timing must be made before proceeding to the KOER Test.<br />
OBD2&1 71