20 Most Recent 2002 Chevrolet TrailBlazer - Page 3 Questions & Answers


Timing chain may have slipped a couple of teeth. Did you check fuel pump pressure and injectors? Security system fault?
Do It Yourself Diagnosis and Repair

2002 Chevrolet... | Answered on Oct 12, 2017


Ambient air temp sensor could be the cause. Normally located in front grille area.

2002 Chevrolet... | Answered on Oct 07, 2017


You should test it before replacing, just to make sure there isn't another problem you are missing. The computer only knows something isn't right.
I would do the testing before removal, as the tps is integrated with the throttle actuation motor. Remove the connector from the sensor and use an ohmmeter to check the sensor. Inspect the connector and pins carefully for damage. Also inspect the wires carefully. If visual inspection looks good, move on to testing. The sensor circuit includes three pins in the connector--pins B, D, and H in the lower left of the diagram below. Remove the rubber air pipe from the throttle so you can open the throttle by hand. Then connect your ohmmeter to pins H and D. Then slowly open the throttle by hand. The resistance between the pins should change continuously and linearly as you open the throttle by hand. If that test is good, move the ohmmeter probes to pins B and D and run the same test. If the sensor fails these tests, replace the whole integrated throttle control assembly. If it passes, the problem is probably with the connector or wiring.


The link below includes the procedure to remove the sensor.
Repair Guides Electronic Engine Emission Controls Throttle Position Sensor...


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2002 Chevrolet... | Answered on Sep 26, 2017


Test the tailgate ajar switch circuit's using a wiring diagram an a volt ohm meter . Probably one of the switch needs to be replaced . Free wiring diagrams here http://www.bbbind.com/free_tsb.html

2002 Chevrolet... | Answered on Sep 23, 2017


The parking function is built into the motor assembly. We normally replace the assembly. If it is assembled with screws you may be able to open it and possibly repair it.

2002 Chevrolet... | Answered on Aug 29, 2017


This has variable valve timing. The VVT is run by oil pressure. A code can be the wrong viscosity oil, oil sludge or a bad VVT mechanism. The only way I'd even think about this vehicle is after it's been inspected by a mechanic. Skip that you you buy this vehicle at your own risk.

2002 Chevrolet... | Answered on Aug 27, 2017


bad ignition switch. First thing to check.

2002 Chevrolet... | Answered on Aug 03, 2017


Well the radio must come out and sent out for repair, nothing you can do to fix this. As far as the other problem goes I suggest you clean the throttle valve and the idle speed control air bypass valve with throttle valve cleaner.

2002 Chevrolet... | Answered on Jul 27, 2017


First step is to see what error codes (DTCs) are present using a code reader.

2002 Chevrolet... | Answered on Jul 14, 2017


1415 secondary air injection system bank 1
1345 crankshaft position-camshaft position correlation
You have something wrong with either your camshaft or crankshaft sensors. That's why car won't run

2002 Chevrolet... | Answered on Jul 06, 2017


How old is your car? When did you have it serviced last?

2002 Chevrolet... | Answered on Jul 05, 2017


Hi, the function of keeping the idle is performed by the idle air control valve. The valve may be stuck or the air passage clogged. This is not related to replacing the battery. Use a voltmeter to probe the back of the connector. Then start the engine and watch the meter as you turn on the a/c. You should see a blip in voltage as the computer tries to open the valve. If no blip, suspect you have a wiring issue. If there is a blip, remove the valve and check the air passages for blockage. If you see blockage, clean with carb cleaner. If no blockage, install a new valve.

2002 Chevrolet... | Answered on Jun 27, 2017


Does your rear AC work? If not, chances are what you're seeing is AC oil from a leak in either the tubing or the evaporator core.

2002 Chevrolet... | Answered on Jun 26, 2017


You are correct. Send a start 12volt to the S connector and if you have a ballast resistor the coil end goes to R.

2002 Chevrolet... | Answered on Jun 12, 2017


The transmission fluid filter is the problem. This service should have been done at 80,000 miles. A dirty filter will cause the charge pump whine and loss of charge pump pressure will cause clutch packs to slip. Do not perform this service yourself, Its messy and not for novices. Do not drive or damage to clutch pack friction plates will occur.

2002 Chevrolet... | Answered on Jun 05, 2017


You started at the wrong end. The speed sensor controls the function of those solenoids you just replaced. Did you change the transmission Fluid and filter, it was due at 80,000 miles. Perform an OBDII scan of the stored fault history. let the OBDII scan be your guide to repairs, to avoid buying parts you don't need. Loss of speed sensor signal will result in no torque converter lock up or overdrive as well as no down shift back to 1st.

2002 Chevrolet... | Answered on Jun 04, 2017

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