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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1170 (Engine Controls Diagnosis - 6.0L - Alternative Fuels (DTC P0005-DTC P2665)) >> Diagnosis >> DTC P1431: Fuel Pressure Sensor Performance >> Diagnostic Aids

Diagnostic Aids

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

For an intermittent condition, refer to Intermittent Conditions .

DTC P1431

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views 
1 Did you perform the Diagnostic System Check Alternative Fuels - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Alternative Fuels (Engine Controls)
2
  1. Turn OFF the ignition.
    2. IMPORTANT: Other DTCs may set.
  2. Disconnect the fuel tank pressure (FTP) sensor. Refer to Fuel Tank Pressure Sensor Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the FTP parameter with a scan tool.
Does the scan tool indicate that the FTP is more than the specified value?		 4.95 V Go to Step 3  Go to Step 7 
3
  1. Connect a 3-amp fused jumper wire between the signal circuit of the FTP sensor and the low reference circuit of the FTP sensor.
  2. Observe the FTP parameter with a scan tool.
Does the scan tool indicate that the FTP is the same or less than the specified value?		 0.02 V Go to Step 8  Go to Step 4 
4
  1. Connect a 3-amp fused jumper wire between the signal circuit of the FTP sensor and a good ground.
  2. Observe the FTP parameter with a scan tool.
Does the scan tool indicate that the FTP is the same or less than the specified value?		 0.02 V Go to Step 6  Go to Step 5 
5 Test the signal circuit of the FTP sensor for an open circuit or for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
6 Test the low reference circuit of the FTP sensor for an open circuit or for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
7 Test the signal circuit of the FTP sensor for a shorted to ground condition. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
8 Test for an intermittent and for a poor connection at the FTP sensor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
9 Test for an intermittent and for a poor connection at the fuel injector control module (FICM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the FICM. Refer to Fuel Injection Control Module Replacement .
Did you complete the replacement?		 - Go to Step 12  -
12
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  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 13 
13 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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