Service Manual Update - Diagnostic Trouble Code (DTC) P0452 and P0453
| Subject: | Service Manual Update - Diagnostic Trouble Code (DTC) P0452 and P0453 |
| Models: | 2004 Saturn VUE Vehicles |
| with 3.5L V-6 Engine (VIN 4 - RPO L66) |
| Attention: | Fixed Operations Manager and Technician |
Purpose
The purpose of this bulletin is to inform Saturn retailers of revised diagnostic procedures for DTC P0452 (fuel tank pressure sensor [FTPS] below calibrated value) and DTC P0453 (FTPS above calibrated value) for 2004 model year Saturn VUE vehicles.
The diagnostic procedures are being revised to reflect the correct voltage values associated with each DTC. The previous printed versions of the 2004 Saturn VUE Service Manual, Vol. 1 had voltage values that were reversed between the two DTCs.
Please obtain all copies of the 2004 Saturn VUE Service Manual, Vol. 1 at your facility. Make copies of the following diagnostic information and insert pages 6-1211 through 6-1216 into your 2004 Saturn VUE Service Manual, Vol. 1 for corrected diagnostic procedures and repair process.
Important: This Service Manual update applies to only 2004 model year Saturn VUE 3.5L V-6 (RPO L66) equipped vehicles. The 2005 model year Service Manual information for DTC P0452 and P0453 is correct.
The SI website will be updated immediately and future Service Stall System SI CD releases will include this and other Service Manual updates.
DTC P0452
(SI Document ID #1450799)
Circuit Description
The DTC P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage diagnostic monitors the function of the FTP sensor circuit. The control module monitors the FTP sensor signal in order to detect vacuum decay and excess vacuum during the evaporative emission (EVAP) diagnostic test. The control module supplies a 5-volt reference and a low reference circuit to the FTP sensor. If the control module detects the FTP sensor signal voltage above a calibrated value, DTC P0452 will set.
The following table illustrates the relationship between FTP sensor signal voltage and the EVAP system pressure/vacuum.
FTP Sensor Signal Voltage | Fuel Tank Pressure |
|---|---|
High, Approximately 1.5 Volts or More | Negative Pressure/Vacuum |
Low, Approximately 1.5 Volts or Less | Positive Pressure |
DTC Descriptor
This diagnostic supports the following DTC.
DTC P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage.
Conditions for Running the DTC
| • | DTC P0453 is not set. |
| • | The ignition is ON. |
| • | DTC P0452 runs once per drive cycle when the above conditions are met. |
Conditions for Setting the DTC
The FTP sensor voltage is more than 4.9 volts for more than 3 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | The FTP sensor parameter on the scan tool should read between 1.4 volts and 1.5 volts with the ignition ON, engine OFF and the fuel cap removed. This represents atmospheric pressure of 0 inches H2O of vacuum. |
| • | The FTP sensor 5-volt reference circuit is shared with the following sensors: |
| - | Exhaust Gas Recirculation (EGR) sensor |
| - | A/C Refrigerant Pressure Sensor |
| - | A/T Input Shaft Speed (ISS) Sensor |
| - | Accelerator Pedal Position (APP) sensor 2 |
| • | Inaccurate readings will occur if resistance measurements are taken on a FTP sensor. The FTP sensor contains an internal amplifier circuit that requires applied voltage to function properly. |
| • | To locate an intermittent problem, monitor the FTP sensor voltage with the ignition ON, engine OFF. Wiggling wires, while watching for change in the FTP sensor voltage, may help locate the area where fault may exist. |
| • | For intermittent conditions, refer to the Intermittent Conditions diagnostic table in the Engine Controls section of the 2004 Saturn VUE Service Manual, Vol. 1 (SI Document ID #1273642). |
Test Description
The number below refers to the step number on the diagnostic table.
2. If DTC P0651 set, the 5-volt reference circuit may be shorted to a voltage.
12. After replacing the PCM, a new minimum throttle position and idle speed must also be established.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls 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 |
Is DTC P0651 also set? | -- | Go to DTC P0651 | Go to Step 3 |
3 |
Does the scan tool indicate that the FTP sensor voltage is more than the specified value? | 4.2 V | Go to Step 5 | Go to Step 4 |
4 |
Does the DTC fail this ignition? | -- | Go to Step 5 | Go to Intermittent Conditions |
5 |
Does the scan tool indicate that the FTP sensor voltage is greater than the specified value? | 4.2 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 connected to battery voltage. Refer to Troubleshooting with a Test Lamp 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. 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 | Inspect for poor connections at the harness connector of the FTP sensor. Refer to Testing for Intermittent 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 | Inspect for poor connections at the harness connector of the control module. Refer to Testing for Intermittent 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 |
Did you complete the replacement? | -- | Go to Step 13 | -- |
13 |
Does the DTC run and pass? | -- | Go to Step 14 | Go to Step 2 |
14 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List | System OK |
DTC P0453
(SI Document ID #1450802)
Circuit Description
The DTC P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage diagnostic monitors the function of the FTP sensor circuit. The control module monitors the FTP sensor signal in order to detect vacuum decay and excess vacuum during the evaporative emission (EVAP) diagnostic test. The control module supplies a 5-volt reference and a low reference circuit to the FTP sensor. If the control module detects the FTP sensor signal voltage below a calibrated value, DTC P0453 will set.
The following table illustrates the relationship between FTP sensor signal voltage and the EVAP system pressure/vacuum.
FTP Sensor Signal Voltage | Fuel Tank Pressure |
|---|---|
High, Approximately 1.5 Volts or More | Negative Pressure/Vacuum |
Low, Approximately 1.5 Volts or Less | Positive Pressure |
DTC Descriptor
This diagnostic supports the following DTC.
DTC P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage.
Conditions for Running the DTC
| • | DTC P0452 is not set. |
| • | The ignition is ON. |
| • | DTC P0453 runs once per drive cycle when the above conditions are met. |
Conditions for Setting the DTC
The FTP sensor voltage is less than 0.2 volts for more than 3 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | The FTP sensor parameter on the scan tool should read between 1.4 volts and 1.5 volts with the ignition ON, engine OFF and the fuel cap removed. This represents atmospheric pressure of 0 inches H2O of vacuum. |
| • | The FTP sensor 5-volt reference circuit is shared with the following sensors: |
| - | Exhaust Gas Recirculation (EGR) sensor |
| - | A/C Refrigerant Pressure Sensor |
| - | A/T Input Shaft Speed (ISS) Sensor |
| - | Accelerator Pedal Position (APP) sensor 2 |
| • | Inaccurate readings will occur if resistance measurements are taken on a FTP sensor. The FTP sensor contains an internal amplifier circuit that requires applied voltage to function properly. |
| • | To locate an intermittent problem, monitor the FTP sensor voltage with the ignition ON, engine OFF. Wiggling wires, while watching for change in the FTP sensor voltage, may help locate the area where fault may exist. |
| • | For intermittent conditions, refer to the Intermittent Conditions diagnostic table in the Engine Controls section of the 2004 Saturn VUE Service Manual, Vol. 1 (SI Document ID #1273642). |
Test Description
The number below refers to the step number on the diagnostic table.
2. If DTC P0651 set, the 5-volt reference circuit may be shorted to ground.
5. This step tests for the proper operation of the circuit in the high voltage range.
11. After replacing the PCM, a new minimum throttle position and idle speed must also be established.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls 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 |
Is DTC P0651 also set? | -- | Go to DTC P0651 | Go to Step 3 |
3 |
Does the scan tool indicate that the FTP sensor voltage is less than the specified value? | 0.2 V | Go to Step 5 | Go to Step 4 |
4 |
Does the DTC fail this ignition? | -- | Go to Step 5 | Go to Diagnostic Aids |
5 |
Does the scan tool indicate that the FTP voltage is at the specified value? | 5 V | Go to Step 8 | Go to Step 6 |
6 | Test the 5-volt reference circuit of the FTP sensor 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 signal circuit of the FTP sensor 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 | Inspect for poor connections at the harness connector of the FTP sensor. Refer to Testing for Intermittent 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 | Inspect for poor connections at the harness connector of the control module. Refer to Testing for Intermittent 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 |
Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC run and pass? | -- | Go to Step 13 | Go to Step 2 |
13 | With the scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List | System OK |
