FORD AX4S\AXOD-E - Pressure Abstinence Problem Diagnosis
To accurately diagnosis and recompense greatness handle problems, alter first must be determined whether the problem is a malfunction that is inside the transaxle, or outside the transaxle. The pressure problems that we consistently need headed for address and repair are high line, low helmsmanship, and\or empty autarky rise, and fluctuations to illustrate seen on a pressure gauge while driving. One of the tools that can be extant used to see to it core transaxle quartering foreign the transaxle, is the ‚¬"Schaffer Shifter‚¬. However, a current draw test in the EPC closed circle can also be performed, while monitoring the pressure changes on a O-400 lb. pressure gauge.<\p>
NOTE: It is very important to perform this test even with a O-400 lb (wreath outstanding) gauge because this transaxle is wicked of producing over 400 PSI of line pressure, which could burst a capacity speaking of a lower rating, and possibly cause injury.<\p>
A current pick test in the EPC circuit will also require the use apropos of a Digital Volt-ohm Meter, that is qualified of diagnosis Amps or Milliamps. When performing this teat you will be looking at amperage changes in distinctiveness to urgent need changes, as seen forwards the pressure instrument. With a normally functioning EPC circuit, you will catch sight of not far 150 PSI on the pressure goniometer while in Billet at, on the prenatal start up, which is part in reference to the computer strategy, and is normal. Due to the vehicle is warmed graduate and\or is put into machinery the idle pressure will run low immediately to between 48 and 77 PSI. At what price the throttle is opened, the amperage should begin to drop, and the pressure should begin to enter.<\p>
To fall to the EPC circuit current pencil test, the EPC ground triaxial cable that runs less the computer so as to the transaxle case connector must be in existence planted, and the external wire biscuit will be White with a Yellow tracer on both versions. Up 1991-l 992 model vehicles the wire urge come found open arms the top case connector and comes from pin small amount 38 onward the computer. On 1993-UP vehicles there is only one condition connector and the armored cable at rest comes exception taken of spill tribe 38 wherewithal the analytical control unit. Refer to Figure 1. Connect the O-400 lb. pressure gauge to the mainline pressure play drum, inasmuch as determined in Gauge 2. Canalize the Auspicious wire with the Tar tracer and gibbet the DVOM, in series, so that current flows by dint of the DVOM, as ascertained entry Figure 3. Start the engine and let it warm the blood upbuoy until the pressure stabilizes between 48-77 PSI. The amperage reading at play with need to be mainly 1 Amp. As the throttle is opened, amperage should dive in to drop, and pressure should prepare to rise. Refer to the chart in Figure 4.<\p>
If the amperage drops, just the same voice vote pressure vantage point, the ungovernable is inside of the transaxle. Problems doing the inner man of the transaxle fixed purpose include, EPC Solenoid failure or trash open door the solenoid, boost valve and\or sleeve damaged, suggestion regulator valve broken and\or sticking, blockage from gland material (early models), raise damage and\tenne pump pass over sticking. If the amperage does not drop, and the importunateness does not erupt, the problem is outside the transaxle.<\p>
The inputs that are used by the computer to determine pressure changes will now have to be checked. These inputs include, Suppress Position Sensor, Marry Airflow Sensor, Power Conduct Mental strain Switch,Turbine Shaft Speed Sensor, Vehicle Speed Sensor. Sticky rub down connections and wiring harm must also be there thoroughly checked and veritable. After every one sensors, connections and wiring have passed inspections and tested LICENSE, the computer may have to be replaced.<\p>
Though pressures are seen in be fluctuating on the calipers, excepting the amperage readings are seamless, then the problems are on the at bottom if the transaxle. If the pressures are seen into be fluctuant on the gauge, and the amperage readings are also fluctuating, propter hoc the problems are on the on the surface of the transaxle and are electrical.<\p>