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DTC P0090, P0091, or P0092

DTC P0090, P0091, or P0092

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

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

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage
High Pressure Fuel Pump Actuator High Control

P0091

P0090

-

High Pressure Fuel Pump Actuator Low Control

-

P0090

P0092



Circuit/System Description

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.

Conditions for Running the DTC


The ignition 1 signal parameter is between 10-18.1 V.

The engine speed is greater than 80 RPM.

The DTCs run continuously within the enabling condition.


Conditions for Setting the DTC


P0090

The high pressure fuel pump actuator voltage is between 1-4.5 V with the actuator commanded OFF.

The DTC sets when the above condition is present for 1 s.



P0091

The high pressure fuel pump actuator voltage is less than 2.7 V with the actuator commanded OFF.

The DTC sets when the above condition is present for 1 s.



P0092

The high pressure fuel pump actuator voltage is greater than 4.5 V with the actuator commanded ON.

The DTC sets when the above condition is present for 1 s.


Action Taken When the DTC Sets


DTCs P0090, P0091, and P0092 are Type B DTCs.

A message center or an indicator displays Reduced Engine Power.


Conditions for Clearing the DTC

DTCs P0090, P0091, and P0092 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. 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).

2. 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.

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.


Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.

2. Engine running, verify that a test lamp flashes between the high pressure fuel pump actuator low control circuit terminal 1 and B+.

3. 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.

4. 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.

5. Ignition ON, verify that a test lamp illuminates between the high pressure fuel pump actuator high control circuit terminal 2 and ground.

6. 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.

7. If all circuits test normal, test or replace the G18 High Pressure Fuel Pump.


Component Testing

Static Test


1. Ignition OFF, disconnect the harness connector at the high pressure fuel pump.

2.
Note

The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.


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.

3. If the resistance is less than 0.3 Ω or greater than 0.6 Ω, replace the high pressure fuel pump.

4. Test for infinite resistance between each terminal and the high pressure fuel pump housing/case.

5. If not the specified value, replace the high pressure fuel pump.


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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Fuel Pump Module Replacement

Control Module References for ECM replacement, setup, and programming