P1082
DTC P1082
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC P1082
- Fuel Filter Pressure Switch Performance
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The fuel filter pressure switch is a normally closed switch located near the fuel filter housing. If fuel supply line vacuum is greater than 14 in Hg the switch will open. The engine control module (ECM) monitors the system in after-run for an open circuit.
Conditions for Running the DTC
ECM monitors the circuit 30 s into the after-run mode.
Conditions for Setting the DTC
* The ECM detects an open or short to voltage in the Fuel Filter Pressure Switch Signal circuit.
* The above condition is present for greater than 3 s.
Action Taken When the DTC Sets
DTC P1082 is a Type C DTC.
Conditions for Clearing the MIL/DTC
DTC P1082 is a Type C DTC.
Diagnostic Aids
* A restricted, kinked, or damaged fuel supply line may cause this DTC to set.
* Contaminated or improper fuel may cause this DTC to set. Refer to Fuel System Specifications (Fuel System Specifications) and Contaminants-in-Fuel Diagnosis (Contaminants-In-Fuel Diagnosis).
* A restricted or contaminated fuel filter may cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Fuel System Description (Fuel System Description)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information.
Special Tools
CH-48027 Digital Pressure Gauge
Circuit/System Verification
1. Ignition ON, verify the scan tool Fuel Filter Pressure Switch parameter displays Normal.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Install the CH-48027 to the fuel system service port on the right front side of the engine. Verify the CH-48027 displays 0 in Hg.
• If not the specified value, refer to Fuel System Diagnosis (Fuel System Diagnosis).
2. Ignition OFF, disconnect the harness connector at the B181 fuel filter pressure switch.
3. Test for less than 10 ohm between the B181 fuel filter pressure switch terminal A and terminal B.
• If greater than the specified value, replace the B181 fuel filter pressure switch.
4. Test for less than 5 ohm between the low reference circuit terminal B and ground.
• If greater than the specified value, repair the open or high resistance in the low reference circuit.
5. Ignition ON, verify the scan tool Fuel Pressure Switch parameter displays High Pressure.
• If other than the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K20 engine control module.
6. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Fuel Filer Pressure Switch parameter displays Normal.
• If other than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
• If all circuits test normal, refer to Diagnostic Aids.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Fuel Pressure Sensor Replacement (Fuel Pressure Sensor Replacement)
* Control Module References (Programming and Relearning)for ECM replacement, programming, and setup.