DTC P0090, P0091, or P0092
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DTC P0090, P0091, or P0092
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DTC P0090 00
Fuel Pressure Regulator Control Circuit Malfunction
DTC P0091 02
Fuel Pressure Regulator 1 Control Circuit Low Voltage
DTC P0092 01
Fuel Pressure Regulator 1 Control Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Ignition
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P0091 02
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P0091 02
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-
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-
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Output Control
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P0091 02
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P0090 00
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P0092 01
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-
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Circuit/System Description
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The fuel pressure regulator solenoid is used to control the fuel pressure from the high pressure fuel pump to the fuel rail. The fuel pressure regulator solenoid is pulse width modulated (PWM). An ignition voltage is supplied to the fuel pressure regulator solenoid. The ECM controls the solenoid by grounding the control circuit with a solid state device called a driver.
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Conditions for Running the DTC
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The ignition is ON or the engine is running.
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•
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The ignition voltage is less than 16 V.
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•
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The DTCs run continuously when the above conditions are met.
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Conditions for Setting the DTC
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P0090 00
The ECM detects the fuel rail pressure regulator solenoid 1 control circuit is open for less than 1 s.
P0091 02
The ECM detects the fuel rail pressure regulator solenoid 1 control circuit is shorted to ground for less than 1 s.
P0092 01
The ECM detects the fuel rail pressure regulator solenoid 1 control circuit is shorted to voltage for less than 1 s.
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Action Taken When the DTC Sets
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DTCs P0090 00, P0091 02, and P0092 01 are Type C DTCs.
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Conditions for Clearing the DTC
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DTCs P0090 00, P0091 02, and P0092 01 are Type C DTCs.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTCs P0090, P0091 or P0092 should not set.
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2.
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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.
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1.
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Ignition OFF, disconnect the harness connector at the Q45A Fuel Rail Pressure Regulator 1.
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2.
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Ignition ON, verify a test lamp illuminates between the ignition 1 voltage circuit terminal 2 and ground.
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3.
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If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
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4.
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Ignition ON, test for 3-4 V between the control circuit terminal 1 and ground.
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5.
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If less than the specified range, test the control circuit for an open or a short to ground. If circuit tests normal, replace the K20 Engine Control Module.
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6.
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If greater than the specified range, test the control circuit for a short to voltage. If circuit tests normal, replace the K20 Engine Control Module.
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7.
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Ignition OFF, test for less than 5 Ω between the control circuit terminal 2 and the K20 Engine Control Module.
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8.
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If greater than the specified range, repair the control circuit for a high resistance.
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9.
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If all circuits test normal, test or replace the Q45A Fuel Rail Pressure Regulator 1.
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Static Test
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1.
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Ignition OFF, disconnect the harness connector at the Q45A Fuel Rail Pressure Regulator 1.
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2.
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Test for 2-4 Ω between the control terminal 1 and the ignition 1 voltage terminal 2.
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3.
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If not within the specified range, replace the Q45A Fuel Rail Pressure Regulator 1.
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4.
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Test for infinite resistance between each terminal and the Q45A Fuel Rail Pressure Regulator 1 housing.
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5.
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If not the specified value, replace the Q45A Fuel Rail Pressure Regulator 1.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
