Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2002SILVERADO 1500 HD, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM & COMPONENT TESTINGIGNITION SYSTEMELECTRONIC IGNITION SYSTEM DIAGNOSIS (3.4L)TEST DESCRIPTION
2002 Chevrolet Silverado 1500 HD, RWD
Test Description
2002 Chevrolet Silverado 1500 HD, RWDSECTION Test Description
The numbers below refer to step numbers in diagnostic procedures.
- 3
It is necessary to disconnect 24x crank sensor in order to ensure that 7x signal is read in 3x reference parameter. - 4
Spark Tester (J 26792) presents a more difficult load on secondary ignition than a normal spark plug. If a miss or a hesitation is caused by a spark plug that is not firing, spark tester should also not fire. - 5
Use a 5 percent saltwater solution in a spray container to induce voltage arcing to ground through faulty insulation of spark plug wires. - 7
If no spark condition follows suspected coil, that coil is faulty. Otherwise, ignition module is cause of no spark. This test can also be performed by substituting a known good coil for one causing no spark condition.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.