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Ford Historic Self-Test Routines
Output Switch Test (EEC-IV Vehicles)
The Output Sw (Switch) Test, also known as the Output State Check, is used
to check the operation of the computer-controlled relays and solenoids on
EEC-IV vehicles. The user can troubleshoot circuits using a voltmeter to
measure voltage at the relays and solenoids in both energized and
non-energized conditions. All measurements should be recorded for reference.
Fuel injectors are NOT energized during this test.
On vehicles equipped with Integrated Vehicle Speed Control (IVSC),
failure to disconnect the vacuum supply hose from the Speed Control
Servo energizes the Speed Control Solenoids.
Select Output Sw Test from the Ford
Function List and press ENTER.
Observe the screens and follow the
instructions.
1) Set Parking Brake.
2) Put Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Turn Key On-Engine Off. Do not Start Engine.
6
!
CAUTION
The test screen indicates the time
remaining. Do not touch vehicle or tools
during this time until the next screen
appears.
Depress the accelerator pedal fully to
turn ON relays and solenoids. Do the
same to turn them OFF. This can be
repeated as many times as required to
locate the fault.
Turn the ignition key Off and press FUNC to return to the Ford Function List.
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Avoid Cooling Fan! It May Turn On During Test.
Ford Function List ?
5)Wiggle test
` 6)Output Sw Test [
7)DCL Data
Procedure Runs Less
Than 3 Minutes.
Time Remaining=1:56
Relays & Solenoids
Are *Off*. Depress &]
Release Throttle
Fully To turn On.
]
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