What is the Output State Check on Ford EEC-IV systems?

It is a special program in the vehicle's computer that allows the user to energize (turn ON) and de-energize (turn OFF), on command, most of the actuators (relays and solenoids) controlled by the computer, used to check computer output voltages and relay/solenoid operation.

Are the fuel injectors and fuel pump energized during the Output State Check?

No. The manual specifically notes that the fuel injectors and fuel pump are not energized during this test.

How do you activate the Output State Check?

Perform the Key On Engine Off (KOEO) Self Test, wait until the Code Reader retrieves all KOEO Self Test and Continuous Memory codes, then step on the accelerator pedal once and release. A solid square icon on the code reader display indicates the actuators are energized; pressing and releasing the pedal again de-energizes them.

Which vehicles can perform the Cylinder Balance Test?

Only vehicles equipped with Sequential Electronic Fuel Injected (SEFI) systems. The computer cuts fuel to each cylinder in sequence and monitors RPM drop to find weak or non-contributing cylinders.

How is the computer put into Cylinder Balance Test Mode?

By performing the KOER Self Test, waiting until all the KOER codes have been transmitted to the Code Reader, and then lightly tapping the accelerator.

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Ford EEC-IV Output State Check & Cylinder Balance Test - Equus 3145 Code Reader

EEC-IV additional tests: Output State Check and Cylinder Balance Test, Chapter 4

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Code-reader service procedure for Ford EEC-IV systems describing the Relay/Solenoid Output State Check (energize actuators via accelerator after KOEO self-test) and the SEFI Cylinder Balance Test.

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This two-page spread (pages 39-40, Chapter 4) from an Equus 3145 code reader manual covers additional diagnostic tests for Ford EEC-IV engine management systems. Page 39 details the Relay and Solenoid Test (Output State Check), a special computer program that lets the user energize and de-energize most computer-controlled actuators (relays and solenoids) on command. The procedure follows the Key On Engine Off (KOEO) Self Test: after all Continuous Memory codes are retrieved, pressing and releasing the accelerator pedal activates the Output State Check; a solid square icon on the code reader display indicates actuators are energized, and pressing the pedal again de-energizes them. Notes warn that fuel injectors and the fuel pump are not energized during the test, and that vehicles with Integrated Vehicle Speed Control require disconnecting the speed control servo vacuum hose first. Page 40 explains the Cylinder Balance Test (SEFI-equipped vehicles only), in which the computer sequentially cuts fuel to each cylinder and monitors RPM drop to find weak or non-contributing cylinders. An SEFI Introduction section explains how Sequential Electronic Fuel Injection differs from other multiport (MFI) systems: each injector fires independently in the engine's firing order, allowing single-injector fuel cutoff. The test mode is entered via the KOER Self Test followed by lightly tapping the accelerator.

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Frequently asked questions

What is the Output State Check on Ford EEC-IV systems?: It is a special program in the vehicle's computer that allows the user to energize (turn ON) and de-energize (turn OFF), on command, most of the actuators (relays and solenoids) controlled by the computer, used to check computer output voltages and relay/solenoid operation.
Are the fuel injectors and fuel pump energized during the Output State Check?: No. The manual specifically notes that the fuel injectors and fuel pump are not energized during this test.
How do you activate the Output State Check?: Perform the Key On Engine Off (KOEO) Self Test, wait until the Code Reader retrieves all KOEO Self Test and Continuous Memory codes, then step on the accelerator pedal once and release. A solid square icon on the code reader display indicates the actuators are energized; pressing and releasing the pedal again de-energizes them.
Which vehicles can perform the Cylinder Balance Test?: Only vehicles equipped with Sequential Electronic Fuel Injected (SEFI) systems. The computer cuts fuel to each cylinder in sequence and monitors RPM drop to find weak or non-contributing cylinders.
How is the computer put into Cylinder Balance Test Mode?: By performing the KOER Self Test, waiting until all the KOER codes have been transmitted to the Code Reader, and then lightly tapping the accelerator.