inspect and repair circuit between switch harness connector and fuse panel.
5.Check Kickdown Switch
Turn ignition off. Check continuity between kickdown switch terminals. Continuity should only exist with accelerator fully depressed. I
f
switch is functioning correctly, go to next step. Replace switch if it failed testing. Road test vehicle to verify repair.
6.Check Circuit Between Kickdown Switch & Kickdown Solenoid
Ensure ignition is off. Disconnect kickdown switch harness connector. Disconnect kickdown solenoid harness connector. Check
continuity of White/Black wire between switch harness connector and solenoid harness connector. If continuity does not exist, inspect
and repair open circuit as needed. If continuity exists, check continuity between White/Black wire terminal at solenoid harness
connector and ground. If continuity exists, inspect and repair short circuit as needed. If continuity does not exist, replace kickdown
solenoid.
VACUUM THROTTLE VALVE DIAPHRAGM (MODULATOR) TEST
1.Check System Integrity
Inspect all vacuum hoses and connections for leaks or damage. Disconnect vacuum hose at diaphragm connection and inspect for
leaking ATF. Repair as needed. Go to next step.
2.Check Vacuum At Modulator
Ensure ignition is off. Disconnect vacuum hose at modulator valve and connect vacuum gauge to hose. Start and run engine at idle.
Vacuum should be 15-22 In. Hg. If vacuum is not within specification, inspect and repair vacuum hose. If vacuum is within specification,
go to next step.
3.Check Modulator Valve Function
Turn ignition off. Remove modulator valve from transaxle. Connect hand-held vacuum pump to valve. Apply 16-20 In. Hg of vacuum.
Ensure vacuum is held by valve. Release vacuum and verify that valve moves freely. If valve is functioning correctly, go to next step.
Replace valve if it fails testing.
4.Check Vacuum Diaphragm Rod
With modulator removed, measure depth of vacuum throttle valve (dimension "N"). See Fig. 5
. Measure length of throttle control valve
rod. Ensure correct length rod is installed. Refer to the THROTTLE VALVE ROD DIMENSION CHART
. If correct rod is installed
in transaxle, inspect operation of vacuum throttle valve in valve body. Install correct rod length as needed.
THROTTLE VALVE ROD DIMENSION CHART
Fig. 5: Measuring Vacuum Throttle Valve Depth
Courtesy of FORD MOTOR CO.
STALL TEST
Testing Precautions
When testing, DO NOT hold throttle open longer than five (5) seconds. Shift to "N" and allow engine to idle for at least two (2) minutes
between tests to cool transaxle. If engine speed exceeds specification, release accelerator immediately as clutch or band slippage is indicated.
"N" Dimension: In. (mm)Rod Length: In. (mm)
1.0 (25.4)1.16 (29.5)
1.0-1.02 (25.4-25.9)1.18 (30.0)
1.02-1.04 (25.9-26.4)1.20 (30.5)
1.04-1.06 (25.9-26.4)1.22 (31.0)
1.06-1.08 (26.9-27.4)1.24 (31.5)
Page 7 of 26 MITCHELL 1 ARTICLE - 1988-94 AUTOMATIC TRANSMISSIONS Ford ATX Overhaul
3/10/2009 http://www.eautorepair.net/app/PrintItems.asp?S0=2097152&S1=0&SG=%7B9B990D68%2D660A%2D45E9%2D8F46%2DE
...
