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 [1][2]Fuel Delivery and Air Induction 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 1-2 Shift Solenoid (SS) Valve (M30)
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 Control Module References for scan tool information.
Special Tools
CH-48027 - Digital Pressure Gauge
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Fuel Filter Pressure Switch parameter displays Normal.
• If parameter does not display Normal
Refer to Circuit/System Testing.
• If parameter displays Normal
3. 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.
• If DTC resets
Refer to Circuit/System Testing.
• If DTC does not reset
4. All OK.
Circuit/System Testing
1. Install the CH-48027 - digital pressure gauge to the fuel system service port on the right front side of the engine.
2. Verify the CH-48027 - digital pressure gauge displays 0 in Hg.
• If the value is not 0 in Hg.
Refer to Fuel System Diagnosis Fuel System Diagnosis.
• If the value is 0 in Hg.
3. Ignition OFF.
4. Disconnect the harness connector at the B181 fuel filter pressure switch.
5. Test for less than 10 ohms between the B181 fuel filter pressure switch terminal A and terminal B.
• If greater than 10 ohms
Replace the B181 fuel filter pressure switch.
• If less than 10 ohms
6. Test for less than 5 ohms between the low reference circuit terminal B and ground.
• If greater than 5 ohms
Repair the open or high resistance in the low reference circuit.
• If less than 5 ohms
7. Ignition ON.
8. Verify the scan tool Fuel Pressure Switch parameter displays High Pressure.
• If parameter does not display High Pressure
Test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K20 engine control module.
• If parameter displays High Pressure
9. 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 parameter does not display High Pressure
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 parameter displays High Pressure
10. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Engine Fuel Vacuum Switch Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming, and setup.