| Check-Engine Light: Repair and Diagnostics Followup |
From "Weekend Mechanic"
episode WKM-204 |
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The final step in our "check-engine" light procedure is to repair the damaged wire leading to the coolant-temperature sensor. The vehicle's onboard computer, in conjunction with a laptop computer and the proper scanner software, allowed this problem to be pinpointed, along with a problem with the vehicle's throttle-position sensor. Important: Included below are the steps in this automotive procedure as shown in the episode. These steps are general guidelines that are applicable to most vehicles. With any particular vehicle, there may be procedures, specifications, settings, tolerances, components, etc. that are specific to that vehicle. There are also variations according to the type and brand of repair kit you select. Always consult your vehicle's service manual when undertaking significant automotive repairs, and read and follow the manufacturer's directions and precautions that come with your kit or replacement parts.
- Use a razor knife to cut the damaged portion of the wiring harness to access the faulty wire (figure A).
- Use wire-strippers to strip about 1/4-inch of insulation away from both ends of the broken wire (figure B).
- Slip some heat-shrink tubing over the wires, and slide it back out of the way.
- Insert the ends of the wire into a solder-type connector, and crimp the ends of the connector tightly (figure C).
- Solder the connection using a soldering gun (figure D). Be sure to use rosin-core solder for electrical work. Avoid acid-core solder, as this will damage electrical wires.
- After the solder has cooled, slide the heat-shrink tubing over the repaired area, and use a heat-gun to shrink the tubing around the wire (figure E).
Finally, after the repairs have been made, and all removed parts and hoses reconnected, the laptop and scanning software is used to check the function of the throttle-position sensor. As the throttle-position is manipulated and the throttle is opened manually, the climbing line on the graph (figure F) indicates that the new sensor is functioning properly.
A similar test is done to check the function of the coolant-temperature sensor. As the engine runs, the actual temperature readout -- as measured by the sensor -- is displayed on the laptop screen.
RESOURCES :
The Complete Idiot's Guide to Trouble-Free Car Care
Author: Dan Ramsey
ISBN: 0028635833
Alpha Books
How Cars Work
Author: Tom Newton
ISBN: 0966862309
Publisher: Black Apple Press
Auto Repair for Dummies
Author: Deanna Sclar
ISBN: 0764550896
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