Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1996ECONOLINE E250, VAN CARGO EXTENDED, 5.8 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 5.8L EEC-IVADDITIONAL SYSTEM FUNCTIONSFUNCTIONSOUTPUT STATE DIAGNOSTIC TEST MODE (DTM)
1996 Ford Econoline E250, Van Cargo Extended, 5.8 H
Output State Diagnostic Test Mode (DTM)
1996 Ford Econoline E250, Van Cargo Extended, 5.8 HSECTION Output State Diagnostic Test Mode (DTM)
- Step 1) Output state DTM is used as an aid in servicing output actuators associated with EEC-IV system. It allows technicians to energize and de-energize most system output actuators on command. This mode is entered from KOEO SELF-TEST after all codes have been retrieved.
- Step 2) With DVOM on 20-volt scale, connect DVOM negative lead to STO terminal at Diagnostic Link Connector (DLC). Connect positive lead to positive battery terminal. Using jumper wire, connect STI to SIG RTN at Diagnostic Link Connector (DLC).
- Step 3) Perform KOEO SELF-TEST until continuous memory test is complete. DVOM will read less than one volt when test is complete. Depress and release throttle. If voltage increases, output state DTM has been entered. If voltage does not increase, depress throttle to WOT and release. If STO voltage still does not increase, see procedures under CIRCUIT TEST QC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.