PRE-RELEASE
DTC P018B-P018D
| DTC P018B-P018D |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P018B
Fuel Pressure Sensor Performance
DTC P018C
Fuel Pressure Sensor Circuit Low Voltage
DTC P018D
Fuel Pressure Sensor Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| 5 V Reference | P018C, P0641, P06A6 | P018C | P018D | P06A6 |
| Signal | P018C | P018C | P018D | P018B |
| Low Reference | - | P018D | - | P06A6 |
| Circuit/System Description |
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump control module monitors the voltage signal from the fuel pressure sensor.
| Conditions for Running the DTC |
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Engine is running.
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DTC P018C, P018D, P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.
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DTC P0641 has not failed this ignition cycle.
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Fuel pump control is enabled and the fuel pump control state is normal.
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The engine has been running for at least 5 seconds.
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| Conditions for Setting the DTC |
The fuel pump control module does not detect a change in the fuel pressure of at least 30 kPa (4.4 psi) when the fuel pump is operating. The fuel pressure sensor performance diagnostic provides a means to detect fuel pressure sensor output that is stuck within the normal operating range of the sensor.
| Action Taken When the DTC Sets |
DTC P018B, P018C and P018D are Type A DTCs.
| Conditions for Clearing the DTC |
DTC P018B, P018C and P018D are Type A DTCs.
| Diagnostic Aids |
Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.
| Reference Information |
Schematic Reference
Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description (LF1) Fuel System Description (LAU or LY7)
Electrical Information Reference
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Circuit Testing
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Testing for Intermittent Conditions and Poor Connections
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Connector Repairs
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| Note | ||
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Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and start and run the engine. Verify that the DTC P018B resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids. |
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Ignition OFF, disconnect the harness connector at the B47 fuel pressure sensor.
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| 2. |
With ignition OFF and all vehicle systems OFF. It can take up to 2 minutes for all vehicle systems to become de-energized. Test for less than 1 Ω between the low reference circuit terminal 2 and ground.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K27 fuel pump flow control module.
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Ignition ON, test for 4.8-5.2 V between the B47 fuel pressure sensor 5 V reference circuit terminal 3 and ground.
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If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump flow control module.
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If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump flow control module.
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Verify the scan tool fuel pressure sensor voltage is less than 1 V.
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If greater than the specified range, test the signal circuit's pin 1 for a short to voltage. If the circuit tests normal, replace the K27 fuel pump's flow control module.
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Fit a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3. Check with the scan tool whether the fuel pressure sensor voltage is greater than 4.8 V.
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump flow control module.
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If all circuits test normal, replace the B47 fuel pressure sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the repair.
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Fuel Pressure Sensor Replacement - Fuel Feed Pipe
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Control Module References
for fuel pump control module replacement, setup, and programming
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