Probe V6-182 3.0L (1990)
Shift Light: Customer Interest
A/T Manual Shift Light - Intermittent Display
Article No. 90-4-8
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LAMP - MANUAL SHIFT LIGHT DISPLAYED INTERMITTENTLY - 4EAT TRANSAXLE
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TRANSAXLE - 4EAT - MANUAL SHIFT LIGHT DISPLAYED INTERMITTENTLY
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TRANSAXLE - 4EAT - NO 3-4 UPSHIFT OR 2-1 DOWNSHIFT
FORD:
1989-90 PROBE
This TSB article is being republished in its entirety to correct the first note in the article. A 4-3 downshift will occur when the manual shift light is on.
ISSUE:
An intermittent display of the manual shift light may be caused by a faulty transaxle pulse signal generator. The 4EAT electronic controller
may store a memory code 55. Also, if the manual shift light flashes or stays on while driving, the transaxle may respond as follows:
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No 3-4 upshift
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No 2-1 downshift
ACTION:
Inspect the pulse signal generator to determine if replacement is required. Refer to the following procedure for service details.
1. Road test the vehicle to check the operation of the manual shift button and light.
NOTE: THE MANUAL SHIFT LIGHT MUST TURN ON WHEN THE MANUAL SHIFT BUTTON IS DEPRESSED. THIS
WILL ALLOW A 4-3 DOWNSHIFT. IF THE MANUAL SHIFT LIGHT TURNS ON WHILE IN 4TH GEAR, WITHOUT
DEPRESSING THE MANUAL SHIFT BUTTON, OR FLASHES INTERMITTENTLY, PROCEED TO STEP # 2.
2. Perform the 4EAT Self Test before disconnecting the transmission controller. Use one of the following methods.
USING SUPER STAR II TESTER
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Turn the ignition key off.
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Connect the MECS adapter cable to the star tester.
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Connect the adapter cable leads to the blue 4EAT STO and STI connectors. (Located under the dash on the left side of the steering shaft).
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Ground the adapter cable.
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Position the star tester switch to the MECS position.
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Latch the center button in the test position.
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Turn the ignition key on.
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Turn the star tester on. It will sound and display an "888" for two seconds.
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Unlatch and relatch the center test button.
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Record codes, then unlatch the center button. Refer to the 1989 Probe Shop Manual, page 17-01-15 for the Service Code Chart and Troubleshooting
Guide.
USING AN ANALOG VOLTMETER
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Connect a jumper wire from the 4EAT STI lead to ground.
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Connect the VOM positive lead to the 4EAT STO wire. For 1990 vehicles use the Engine Emissions Diagnosis (non-NAAO) Shop Manual, page
15-5. For 1989 vehicles use the 1989 Probe Shop Manual, page 17-01-14.
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Connect the VOM negative lead to ground.
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Set the VOM to the 20 volt range.
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Turn the ignition key on.
