Equus 3140 - Scan Tool CanOBD2&1 Kit - Manual (Page 77)

CanOBD2&1 75
E
Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - KOER TEST
7. When prompted by the CanOBD2&1
Scan Tool, start the engine and press
the ENTER/LD button.
■ A "One moment please preparation
for test is in progress” message shows
temporarily on the CanOBD2&1 Scan
Tool's display, followed by the mes-
sage "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 set-
ting for two minutes from the time the
"Perform Timing Check within 2 min-
utes" message displays. This allows
the user to check the computer's abil-
ity 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 tim-
ing 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 tim-
ing must be made before proceeding to the KOER Test.