How to test a check engine light test?
Automotive Circuit Testing 101 – Check Engine Light Help 1 Open circuit (or partially open such as a chaffed line which causes high resistance due to heat when circuit load is on) 2 Short to power 3 Short to ground 4 High resistance (usually caused by corrosion or poor connections)
Can a test light be used to test a ground circuit?
Your test light circuit tester is great for checking for voltage, but it can also be used to check a ground circuit. If you know that a certain electrical component is getting juice on the positive side, you need to check to see if it has a good grounding point.
Where do you check the electrical connections on a Jeep Cherokee?
THEY MUST BE DRIVEN, IN THE VEHICLE START AND DRIVE CYCLE (S) SUCH THAT ALL DIAGNOSTIC MONITORS HAVE RUN. – check the electrical connections at the PCM, TCM, TPS, TRS and Transmission solenoids for pushed out or corroded terminals.
What can you test with a test light?
Your test light circuit tester is great for checking for voltage, but it can also be used to check a ground circuit. If you know that a certain electrical component is getting juice on the positive side, you need to check to see if it has a good grounding point. This is easy.
How to test your Cherokee coolant sensor and wiring?
To properly test the coolant sensor, you’ll need a multimeter that can test for resistance, most do. Attach one lead of your tester to the black wire, and the other lead to ground. Remove the coolant sensor from the reservoir tank. With the float all the way down, the resistance across the contacts should be zero.
What does bad light mean on Jeep Cherokee?
If you own a 1990s Jeep Cherokee there’s a good chance you’ve become intimately familiar with the Coolant Sensor Bad light on your dashboard. What does it mean, anyway?
How is the crankshaft position sensor in a Jeep Grand Cherokee?
As you can see in the photo above, the crankshaft position sensor is a 3-wire sensor. Since it’s a Hall Effect sensor, it needs power and Ground to generate its crankshaft position signal. Power is in the form of 8 Volts DC (1994-1995 5.2L V8 Jeep Grand Cherokee) or 5 Volts DC (1996 5.2L V8 Jeep Grand Cherokee).
How do you test the spark signal on a jeep?
Now, testing the Signal or green wire. This wire comes from your PCM so your coil knows when to shoot the mega voltage to the distributor then to the spark plugs. Use a small bare wire to back prob the plug at the green wire location. Insert the wire into the back of the plug until it bottoms out.