Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 69)

Retrieving Codes
KOEO SELF TEST (MCU SYSTEMS)
Chapter 4 66
■ In-Line 4 and In-Line 6 with canister control
valve: Remove hose from connector port B. Reconnect
after testing is completed.
■ V-6 and V-8: Remove PCV valve: Reconnect after
testing is completed.
■ 2.3L with GK code: Locate the anti-backfire vacuum
switch tee behind the MCU module and remove the
cap. Reconnect after testing is completed.
■ 2.3L with EGR vacuum load control valve: Cover
vacuum valve vent holes with tape. Remove the tape
after testing is completed.
■ 4.2L with vacuum delay valve: Uncap restrictor in
Thermactor Air Diverter (TAD) solenoid vacuum line.
Reconnect after testing is completed.
■ 5.8L with vacuum delay valve: Uncap restrictor in
Thermactor Air Bypass (TAB) solenoid vacuum line.
Reconnect after testing is completed.
KEY ON ENGINE OFF (KOEO) SELF TEST (MCU
SYSTEMS)
• The "Preliminary Procedures" (page 66) must be
completed before performing the KOEO Self Test
• Always observe safety precautions before and during
testing process.
• ALWAYS check Code Reader battery before retrieving
fault codes.
• Fix any known mechanical problems before this test.
1. Warm-up engine to normal operating temperature before
this test.
2. Turn ignition off.
3. Turn the Code Reader switch to OFF then connect it to
the vehicle's test connector.
■ MCU Systems have one six pin connector only.
4