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Home › Cadillac › 2006 › Escalade EXT › Repair and Diagnosis › Engine Performance › System › Engine Control System - 4.8L, 5.3L, And 6.0L - DTC P0442 To DTC P2120 › DTC P0453 › Test Description

Test Description

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

  1. 2:  If DTC P0641 or P0651 is 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 - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Idle the engine for 1 minute.
  2. Monitor the diagnostic trouble code (DTC) information with the scan tool.
Did DTC P0641 or P0651 fail this ignition?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 3 
3
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the fuel tank pressure sensor voltage with a scan tool.
Is the fuel tank pressure sensor parameter more than the specified value?		 4.3 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 Testing for Intermittent Conditions and Poor Connections
5
  1. Turn OFF the ignition.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Disconnect the fuel tank wiring harness at the fuel tank harness connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Observe the fuel tank pressure (FTP) sensor voltage with a scan tool.
Does the scan tool indicate that the fuel tank pressure sensor parameter is more than the specified value?		 1 V Go to Step 6  Go to Step 7 
6 Test the signal circuit of the FTP for a short to voltage between the fuel tank harness connector and the control module. Refer to Circuit Testing 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 at the fuel tank harness connector with a test lamp connected to battery voltage. Refer to Circuit Testing in Wiring Systems.
Did 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 between the fuel tank harness connector and the control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 10 
9
  1. Remove the fuel tank. Refer to Fuel Tank Replacement (Single Tank) or Fuel Tank Replacement (Dual Tanks - Front) or Fuel Tank Replacement (Dual Tanks - Rear) or Fuel Tank Replacement (Single Tank w/5.3L (L59) Engine) .
  2. Disconnect the FTP sensor harness connector.
  3. Inspect the fuel tank wiring harness for the following conditions:
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
10 Inspect for poor connections at the harness connector of the control module. Refer to Testing 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 (1500 Series) or Fuel Tank Pressure Sensor Replacement (2500 Series) .
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the powertrain control module (PCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 13  -
13
  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 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 - Vehicle in Vehicle DTC Information System OK
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