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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1068 (Engine Controls Diagnosis - 4.8L, 5.3L, & 6.0L (DTCS P0141 To P0446)) >> Diagnosis >> DTC P0169 >> Test Description

Test Description

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.

The number below refers to the step number on the diagnostic table.

  1. 3:  The frequency read on the scan tool should be stable. A lower reading that momentarily rises above 100 Hz may indicate that water droplets in the fuel are present.
DTC P0169

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Engine controls. - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 Was DTC P0179 also set? - Go to DTC P0179  Go to Step 3 
3  Read the fuel composition frequency on the scan tool.
Is the frequency above the specified value?		 139 Hz Go to Step 4  Go to Step 5 
4
  1. The fuel in the tank must be replaced.
  2. Follow the fuel tank draining procedure and remove the fuel. Refer to Fuel Tank Draining Procedure (4.8L, 5.3L, and 6.0L Engine) or Fuel Tank Draining Procedure (5.3L (L59) Engine) .
  3. Refill with unleaded gasoline or an ethanol blend of 70 percent or less. See table in Diagnostic Aids for maximum allowed ethanol percentage vs. ambient temperature.
  4. Allow the engine to run for 6 minutes.
Is the fuel composition frequency below the specified value?		 138 Hz Go to Step 6  Go to Diagnostic Aids
5
  1. The fuel in the tank contains an ethanol blend that is higher than recommended for the ambient temperature.
  2. Refill with unleaded gasoline to achieve an ethanol blend of 70 percent or less. See table in Diagnostic Aids for maximum allowed ethanol percentage vs. ambient temperature.
  3. Allow the engine to run for 6 minutes.
Is the fuel composition frequency below the specified value?		 138 Hz Go to Step 6  Go to Diagnostic Aids
6
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 7 
7 Observe the Capture 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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