DTC P1255 or P064A
DTC P1255 or P064A |
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 P064A
Fuel Pump Control Module Performance
DTC P1255
Fuel Pump Control Module Driver Over-temperature
Circuit/System Description |
The engine control module (ECM) supplies voltage to the fuel pump control module when the ECM detects that the ignition is on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the fuel pump control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
Conditions for Running the DTC |
The engine is running.
Conditions for Setting the DTC |
The fuel pump control module detects an over-temperature fault.
Action Taken When the DTC Sets |
DTCs P064A and P1255 are Type A DTCs.
Conditions for Clearing the DTC |
DTCs P064A and P1255 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
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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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 |
1. |
Verify that DTC P0231, P0232 or P023F are not set.
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2. |
If any of those codes are set, refer to
DTC P0231, P0232, or P023F
.
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3. |
Ensure that the entire undercarriage of the vehicle is clean, especially around the area where the K27 fuel pump control module is located. Clear all codes from the K27 fuel pump control module and test drive the vehicle. Verify that DTC P1255 or P064A do not set.
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4. |
If DTC P1255 or P064A reset, replace the K27 fuel pump control module.
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Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for fuel pump control module replacement, setup, and programming