Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 53)

OBD2 & 1 51
E
Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - ENGINE TIMING CHECK
IMPORTANT: DO NOT service "Continuous Memory" codes
at this time. Before "Continuous Memory" codes can be serv-
iced, both the KOEO and the KOER Self-Tests must pass (a
PASS code 11 or 111 is obtained). After both of these tests
have passed, erase the vehicle's computer memory (see
Erasing DTCs on page 80), take the vehicle for a short drive,
then repeat the KOEO Self-Test. If any Continuous Memory
faults are present, service them all this time. Consult the vehi-
cle's service repair manual for servicing Continuous Memory
Fault Codes.
The green, yellow and red LEDs are used (with the LCD dis-
play) as visual aids to make it easier to determine engine sys-
tem conditions. See Servicing Diagnostic Trouble Codes
on page 78 for information on interpreting LEDs and servic-
ing DTCs.
Do not proceed to the ignition timing check procedure or the
KOER test until a PASS code (code 11 or 111) for KOEO test
is obtained.
Engine Timing Check
Before performing the KOER Self-Test, the vehicle's Ignition
Base Timing and the computer's ability to electronically con-
trol timing advance must be checked for proper operation.
Maladjustment of ignition timing, or a problem in the advance
circuit, might generate false fault codes when performing the
KOER Self-Test that would cause the test to be invalid. Use
the following procedures to check for proper ignition timing
and to verify the computer's ability to electronically advance
ignition timing.
The following "Timing Check" procedure is only applica-
ble to 1992 and older vehicles (excluding diesel
engines). For 1993 and newer vehicles, refer to the vehi-
cle's service repair manual for procedures to check and
adjust timing. DO NOT ATTEMPT TO ADJUST TIMING ON
THESE VEHICLES WITHOUT MANUFACTURER'S SPECI-
FICATIONS AND PROCEDURES.
For 1992 and older vehicles, the Tool can be used in combination with
a timing light to check ignition timing and the vehicle computers ability
to advance ignition timing.
Check your vehicle thoroughly before performing any test.
See Before You Begin on page 17 for details.
ALWAYS observe safety precautions whenever working on a
vehicle. Read and follow Safety Precautions on page 3
before performing this test.