DTC P0090, P0091, or P0092
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DTC P0090, P0091, or P0092
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DTC P0090
Fuel Pressure Regulator 1 Control Circuit
DTC P0091
Fuel Pressure Regulator 1 Control Circuit Low Voltage
DTC P0092
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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High Pressure Fuel Pump Actuator High Control
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P0091
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P0090
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-
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High Pressure Fuel Pump Actuator Low Control
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-
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P0090
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P0092
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Circuit/System Description
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High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The engine control module (ECM) provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground. The ECM monitors the voltage on the circuits to detect a failure.
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Conditions for Running the DTC
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The ignition 1 signal parameter is between 10-18.1 V.
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The engine speed is greater than 80 RPM.
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The DTCs run continuously within the enabling condition.
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Conditions for Setting the DTC
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P0090
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The high pressure fuel pump actuator voltage is between 1-4.5 V with the actuator commanded OFF.
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The DTC sets when the above condition is present for 1 s.
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P0091
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The high pressure fuel pump actuator voltage is less than 2.7 V with the actuator commanded OFF.
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The DTC sets when the above condition is present for 1 s.
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P0092
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The high pressure fuel pump actuator voltage is greater than 4.5 V with the actuator commanded ON.
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The DTC sets when the above condition is present for 1 s.
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Action Taken When the DTC Sets
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DTCs P0090, P0091, and P0092 are Type B DTCs.
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A message center or an indicator displays Reduced Engine Power.
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Conditions for Clearing the DTC
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DTCs P0090, P0091, and P0092 are Type B 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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Engine idling, observe the Actual Fuel Rail Pressure parameter with a scan tool. The pressure should be approximately 3.5-5.5 Mpa (508-798 psi).
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2.
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Command an increase and decrease in fuel pressure with a scan tool. Observe the scan tool Desired Fuel Rail Pressure and the Fuel Rail Pressure parameters. The Desired Fuel Rail Pressure and the Fuel Rail Pressure should closely match in all the commanded states.
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3.
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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 G18 High Pressure Fuel Pump.
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2.
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Engine running, verify that a test lamp flashes between the high pressure fuel pump actuator low control circuit terminal 1 and B+.
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3.
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If the test lamp is always ON, test the high pressure fuel pump actuator low control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
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4.
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If the test lamp is always OFF, test the high pressure fuel pump actuator low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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5.
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Ignition ON, verify that a test lamp illuminates between the high pressure fuel pump actuator high control circuit terminal 2 and ground.
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6.
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If the test lamp does not illuminate, test the high pressure fuel pump actuator high control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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7.
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If all circuits test normal, test or replace the G18 High Pressure Fuel Pump.
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Static Test
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1.
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Ignition OFF, disconnect the harness connector at the high pressure fuel pump.
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2.
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Note
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The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.
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Test for 0.35-0.6 Ω at 20°C (68°F) of resistance between low control circuit terminal 1 and high control circuit terminal 2.
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3.
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If the resistance is less than 0.3 Ω or greater than 0.6 Ω, replace the high pressure fuel pump.
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4.
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Test for infinite resistance between each terminal and the high pressure fuel pump housing/case.
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5.
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If not the specified value, replace the high pressure fuel pump.
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Dynamic Test
Engine idling, command the Fuel Pressure Control to Increase with a scan tool. The Fuel Rail Pressure Sensor parameter should increase with each command.
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
