LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1983 >> Ranger 2.2 P >> Repair and Diagnosis >> Engine Performance >> System >> 2.8L EEC IV Testing >> Testing & Diagnosis >> Tad System Test (Code 45)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Tad System Test (Code 45)

  1. Verify proper vacuum line routing to the TAD solenoid and to the diverter valve. If not correct, repair faulty routing and repeat Quick Test. If ok, proceed to step 2).
  2. Disconnect vacuum line on diverter valve and cap off vacuum line. Turn ignition off and wait 10 seconds. Repeat Engine Running Test and record service codes. Check for code 45. If code 45 is present, EEC system is ok, check Thermactor system. If code 45 is not present, proceed with test.
  3. Turn ignition off and wait 10 seconds. Disconnect TAD solenoid connector and measure solenoid resistance. If resistance is less than 50 ohms or greater than 100 ohms, replace TAB/TAD solenoid assembly and repeat Quick Test. If resistance is between 50 and 100 ohms, reconnect solenoid and proceed with test.
  4. Turn ignition off and wait for 10 seconds. Connect voltmeter negative lead to self-test output connector and positive lead to battery positive post. Turn ignition on. Run Quick Test until the completion of the Continuous Codes. Voltmeter will read 0 volts. Depress and release throttle. Voltage reading should increase. If voltage increased, leave voltmeter connected and proceed with test. If voltage reading did not increase, depress and release throttle again. If voltage still does not increase, perform Output State Not Functioning Test.
  5. Disconnect TAD connector. Connect voltmeter negative lead to circuit 200 and positive lead to TAD solenoid circuit 361. Depress and release throttle while observing voltmeter. If output cycles on and off (high to low voltage), replace TAD solenoid and repeat Quick Test. If output does not cycle on and off, proceed to step 6).
  6. Turn ignition off and wait 10 seconds. Disconnect processor and inspect both 60 pin connectors. Measure resistance of harness circuit 200 to ground. If resistance is less than 10,000 ohms, repair harness short and repeat Quick Test. If resistance is 10,000 ohms or more, replace processor and repeat Quick Test.
scientia non olet · About LEMON Manuals