A/T - 4EAT Diagnosis Procedure

90ford02

Article No. 90-2-6

TRANSMISSION - 4EAT - SELF TEST DIAGNOSIS PROCEDURE

FORD: 1989-90 PROBE


ISSUE: The diagnostic self test procedures for the 4EAT transmission have been clarified to assist in vehicle service.

ACTION: Three methods for running the 4EAT transmission self test are available.

1. USING SUPER STAR II TESTER
^ Turn the ingnition key off

^ Connect the MECS adapter cable to the star tester

^ Connect the adapter leads to the blue 4EAT STO and STI connectors.

NOTE: THE STO AND STI CONNECTORS ARE LOCATED UNDER THE DASH ON THE LEFT SIDE OF THE STEERING SHAFT.

NOTE: THE SELF TEST CONNECTORS FOR THE 1990 NON TURBO 2.2L ARE LOCATED IN THE ENGINE COMPARTMENT NEAR THE LEFT STRUT TOWER. THESE ARE THE SAME CONNECTORS THAT ARE USED FOR THE EEC SELF TEST.
^ Ground the adapter cable.
^ Slide the star tester switch to the MECS position.
^ Latch the center button in the test position.
^ Turn the ignition key ON.

^ Turn the star tester on. It will sound and display "888" for about two (2) seconds.
^ Unlatch and relatch the center test button.
^ Record all codes, than unlatch the center button. See the 1989 Probe Shop Manual, Section 17-01-15 for code chart and diagnosis.

NOTE: A BLANK DISPLAY INDICATES A PASS CODE.

2. USING ANALOG VOLTMETER
^ Connect a jumper wire from the 4EAT STI lead to ground.

^ Connect the VOM positive lead to the 4EAT STO wire.

^ Connect the VOM negative lead to ground.
^ Set the VOM to the 20 volt range.
^ Turn the ignition key ON.

^ Disconnect and reconnect the STI jumper to ground.

^ Watch the VOM needle for any code indications. Refer to the 1989 Probe Shop Manual, Section 17-01-15 for code chart and diagnosis.

NOTE: NO VOM NEEDLE MOVEMENT INDICATES A PASS CODE.

3. USING MANUAL SHIFT LIGHT

^ Turn the ignition key ON

^ Jumper the 4EAT STI wire to ground

^ Watch the MSL for blinking
^ Record all codes

NOTE: NO BLINKING INDICATES A PASS CODE

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 590000