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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1025 (Engine Controls - 4.8L, 5.3L, & 6.0L (Troubleshooting & Diagnosis)) >> Troubleshooting >> Fuel Composition Sensor Test

Fuel Composition Sensor Test

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fuel Composition Sensor Test

Step Action Values Yes No
1
  1. Test fuel composition using the J 44175  Fuel Composition Tester and the Instruction Manual.
  2. Record the frequency from the special tool test.
  3. Compare the special tool test frequency and the Fuel Comp. Sensor Frequency parameter on the scan tool.
Is the difference between the two frequencies less than the specified value?		 12 Hz Go to Step 2  Go to Step 3 
2
  1. Clean the fuel system. Refer to Fuel System Cleaning .
  2. Replace the fuel filter. Refer to Fuel Filter Replacement (5.3L (L59) Engine) .
Did you complete the actions?		 - Go to Step 4  -
3 Replace the FCS. Refer to Fuel Composition Sensor Replacement (5.3L (L59) Engine) .
Did you complete the replacement?		 - Go to Step 4  -
4
  1. Reassemble the vehicle as necessary.
  2. Clear any DTCs with a scan tool.
  3. Start the engine.
  4. Operate the vehicle in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 5 
5 Observe the DTC Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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