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Home >> Buick >> 2004 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (DTC P0140 To P0496) >> Engine Controls Diagnosis >> DTC P0452 >> Test Description
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Test Description

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

  1. 5:  This step tests for the proper operation of the circuit in the high voltage range.
DTC P0452

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Engine Controls Connector End Views  or  Powertrain Control Module (PCM) Connector End Views 
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2
  1. Idle the engine for 1 minute.
  2. Monitor the diagnostic trouble codes (DTC) information using the scan tool.
Did DTC P0641 or P0651 fail this ignition?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 3 
3 Observe the fuel tank pressure (FTP) sensor voltage with a scan tool.
Is the FTP sensor parameter less than the specified value?		 0.1 V Go to Step 5  Go to Step 4 
4
  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 5  Go to Intermittent Conditions
5 
  1. Turn OFF the ignition.
  2. Disconnect the FTP sensor harness connector.
  3. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the FTP sensor and the signal circuit of the FTP sensor. Refer to Using Fused Jumper Wires in Wiring Systems.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the FTP sensor with a scan tool.
Is the FTP sensor parameter within the specified value?		 4.8-5.2 V Go to Step 8  Go to Step 6 
6 Test the FTP 5-volt reference circuit for a short to ground, for high resistance, or for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7 Test the FTP signal circuit for a short to ground, for high resistance, or for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
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 toTesting for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
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 control module. Refer toTesting for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
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 control module. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 12  -
12
  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 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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