Test TC: Step 51

51) Checking VREF At TPS  Refer to wiring circuit diagrams in TESTS B8 and B17. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box and connect ECA to breakout box. Disconnect TPS (FIPL on 7.3L diesel) and set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIGNAL RETURN at the TPS (or FIPL) vehicle harness connector. If voltage is 4.0-6.0 volts, reconnect TPS (or FIPL) and go to next step. If voltage is not as specified, go to TEST A3.