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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Test DA - Temperature Sensor Test (Act, ECT & Vat) >> Test DA: Step 11
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Test DA: Step 11

11) Check Continuity of Sensor Signal & SIG RTN Circuits  Turn key off and wait 10 seconds. Ensure suspect temperature sensor is disconnected. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 7 (ECT sensor) or test pin No. 25 (ACT or VAT sensor), at the breakout box and sensor signal circuit at the sensor vehicle harness connector. Also measure resistance between test pin No. 46 and SIG RTN circuit at the sensor vehicle harness connector. If both readings are less than 5 ohms, replace ECA. Remove breakout box, reconnect components and rerun QUICK TEST. If either reading is 5 ohms or more, repair open circuits. Remove breakout box, reconnect components and rerun QUICK TEST.

NOTE: There is a break in the step numbering sequence at this point, skipping from step 11) to step 20). Break is due to previous chart references to these testing procedures. No test procedures have been omitted.