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Home >> Ford >> 1990 >> F-Super Duty 7.3 M, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Basic Testing) >> Electronic DISTRIBUTORLESS Ignition System (EDIS) 4.0L Engine >> Test 31, Check VRS For Open Circuit

Test 31, Check VRS For Open Circuit

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1991 Ford Ranger, 1991 Ford RV Cutaway, 1991 Ford Pickup, 1991 Ford F-Super Duty, and 1991 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

With key off and ECA disconnected, set DVOM to 20-k/ohm scale. Measure resistance between breakout box pins No. J32 (VRS S) and J48 (VRS E).

If resistance is less than 2025 ohms, replace VR sensor. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes. If resistance is greater than 2025 ohms, repair open circuit. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes.

NOTE: Tests 32-37 may also be used for diagnosing KOEO Code 16, Continuous Memory Code 18 and/or "CHECK ENGINE" light on: IDM failure.
CAUTION: DO NOT connect EEC-IV ECA to EEC-IV breakout box while performing EDIS diagnosis unless so instructed.
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