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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 P0453 >> Test Description
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Test Description

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

  1. 2:  If DTC P1639 set, the 5-volt reference circuit may be shorted to a voltage.
DTC P0453

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 code (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
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the fuel tank pressure (FTP) sensor parameter with a scan tool.
Is the FTP sensor parameter more than the specified value?		 4.3 V Go to Step 5  Go to Step 4 
4
  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 5  Go to Intermittent Conditions
5
  1. Turn OFF the ignition.
  2. Disconnect the FTP sensor harness connector. Refer to Fuel Tank Pressure Sensor Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the FTP sensor parameter with a scan tool.
Is the FTP sensor parameter more than the specified value?		 4.3 V Go to Step 6  Go to Step 7 
6 Test the FTP signal circuit for a short to voltage or a short to a 5-volt reference circuit. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
7 Probe the low reference circuit of the FTP sensor with a test lamp that is connected to battery voltage. Refer to Troubleshooting with a Test Lamp in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 8 
8 Test the low reference circuit of the FTP sensor for an open. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
9 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 13  Go to Step 11 
10 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 13  Go to Step 12 
11 Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the control module. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 13  -
13
  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 14 
14 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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