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Ford OBD1 Systems
ADDITIONAL TESTS FOR EEC-IV SYSTEMS - WIGGLE TEST
42
If the Scan Tool cannot link to the vehicle's computer after three
attempts, the message “Contact Technical Support” displays.
- Press SYSTEM MENU
to return to the Ford Menu.
- Turn the ignition OFF, and
disconnect the Scan Tool.
- Contact Technical Support for
assistance.
9. If the Scan Tool was able to link to the
vehicle successfully an "Output State
check active..." message shows temporar-
ily, followed by a display that instructs you
how to perform the test.
10. When prompted, press the accelerator
pedal once, then release. This activates
the Output State Check and energizes
most of the actuators (relays and
solenoids) that are controlled by the
vehicle's computer.
If your vehicle is equipped with an Integrated Vehicle Speed
Control, disconnect the vacuum supply hose from the speed
control servo before pressing the accelerator. Reconnect
vacuum hose after test.
11. To de-energize the actuators, press the accelerator pedal again and
release.
12. The procedure can be repeated as many times as desired by
pressing and releasing the accelerator pedal.
13. Consult the vehicle's service repair manual for a list of actuators
(solenoids and relays) controlled by the computer that apply to the
vehicle under test, and which actuators should energize and de-
energize when performing the Output State Check. All applicable
actuators should be on when energized and off when de-energized.
14. If an actuator is not responding to the Output State Check, follow the
procedures described in the vehicle's service manual to check
computer actuator output circuit voltages and/or grounds.
15. To quit the Output State Check, turn the ignition OFF and
disconnect the Scan Tool from the vehicle.
Wiggle Test
Since any DTC’s from Wiggle Test results are saved in
Continuous Memory, it is suggested that you clear any DTC’s
in Continuous Memory before performing Wiggle Test.
Use this test to check for intermittent faults in some circuits.
Circuits Tested:
1984 & Newer - Air Charge Temp Sensor (ACT), Barometer Pressure
Sensor (BP), Engine Coolant Temp Sensor (ECT), Exhaust Gas Oxygen
Sensor (EGO), EGR Valve Position Sensor (EVP), Manifold Absolute Pres-
sure (MAP), Throttle Position Sensor (TP), Vane Air Temp Sensor (VAT)
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