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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0442 To DTC P2101 >> DTC P0452 >> Test Description

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step verifies that the condition is present.
  2. 4:  This step tests the 5-volt reference of the FTP sensor.
  3. 5:  This step tests if another component is causing the 5-volt reference circuit condition.
  4. 6:  If the scan tool displays 5 volts, the FTP sensor signal circuit, the FTP sensor 5-volt reference circuit and the control module are OK.
DTC P0452

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
Is the Fuel Tank Pressure Sensor parameter less than the specified value?		 0.1 V Go to Step 4  Go to Step 3 
3
  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 4  Go to Intermittent Conditions
4 
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the fuel tank pressure (FTP) sensor.
  3. Measure the voltage from the 5-volt reference circuit of the FTP sensor to a good ground with a DMM. Refer to Circuit Testing .
Is the voltage within the specified value?		 4.8-5.2 V Go to Step 6  Go to Step 5 
5  Disconnect the following components, while monitoring the DMM:
  • The manifold absolute pressure (MAP) sensor
  • The throttle position (TP) sensor
  • The A/C pressure sensor

Is the DMM within the specified value when any of the components are disconnected?		 4.8-5.2 V Go to Step 11  Go to Step 7 
6 
  1. 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.
  2. Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
Is Fuel Tank Pressure Sensor parameter within the specified value?		 4.8-5.2 V Go to Step 9  Go to Step 8 
7 Test the FTP 5-volt reference circuit for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
8 Test the FTP signal circuit for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 10 
9 Test for an intermittent and for a poor connection at the FTP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 12 
10 Test for an intermittent and for a poor connection at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 14  Go to Step 13 
11 Replace the component that affected the 5-volt reference circuit. Refer to Throttle Body Assembly Replacement , Manifold Absolute Pressure Sensor Replacement or Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 14  -
12 Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 14  -
13 Replace the powertrain control module (PCM). Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 14  -
14
  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 15 
15 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 System OK
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