Test DN: Step 6

6) Check VREF Circuit Voltage  With EVP harness disconnected, set DVOM on 20-volt scale. With KOEO, measure voltage at EVP sensor vehicle harness connector between VREF circuit and SIG RTN circuit. If reading is between 4 and 6 volts, replace EVP sensor. Repeat QUICK TEST. If reading is less than 4 volts or more than 6 volts, go to TEST C, step 1).