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September 29, 2015 02:00 AM

Factory Fixes: Toyota, Ford and GM

Jim DePalma
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    Toyota

    Some 2003-04 4-Runner SUVs with 2UZ-FE engines and height control systems may turn on the check engine light and log trouble code C1735 in the suspension control module. One probable cause, says Toyota, is moisture intrusion into the height control compressor's exhaust solenoid valve.

    An improved, new-design solenoid valve is now available to eliminate the condition. Unfortunately, the valve is integral with the compressor, so you are going to have to replace the entire assembly with part No. 48910-60020 to gain the benefits from the new valve. After the new compressor is installed, clear the trouble code and make sure the height control system is functioning as designed.

    Ford

    Some 2003-05 Excursions, 2003-06 F-Super Duty pickup trucks and 2004-06 Econoline vans with 6.0-liter diesel engines may produce an exhaust odor that slowly enters the passenger compartment. Leakage from one or both exhaust manifolds is the likely source of the smell, reports Ford. An improved design exhaust manifold gasket, part No. 5C4Z-9448-A, is now available to eliminate the odor issue.

    General Motors

    Drivers of 2000-02 Chevy Cavaliers and Pontiac Sunfires with the 2.2-liter engines may complain of intermittent air conditioning operation accompanied by a hesitation, surge or misfire and an illuminated check engine light. Trouble code P0530 may be stored in computer memory, as well.

    GM says that all of these symptoms could be due to a break in the a/c pressure sensor wiring harness. The cause of the break is that the harness was manufactured too short at the factory. That causes problems when the engine flexes on its mounts.

    Wiring an extension harness and connector, part No. 12102748, into the existing harness should remedy all the problems immediately.

    "Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].

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