DTC P0090, P0091, or P0092
Diagnostic Instructions
DTC Descriptor
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
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Ignition
|
P0091 02
|
P0091 02
|
-
|
-
|
|
Output Control
|
P0091 02
|
P0090 00
|
P0092 01
|
-
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Circuit/System Description
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.
Conditions for Running the DTC
| • |
The ignition is ON or the engine is running. |
| • |
The ignition voltage is less than 16 V. |
| • |
The DTCs runs continuously once the above
conditions are met. |
Conditions for Setting the DTC
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.
Action Taken When the DTC Sets
DTCs P0090 00, P0091 02, and P0092 01 are
Type C DTCs.
Conditions for Clearing the DTC
DTCs P0090 00, P0091 02, and P0092 01 are
Type C DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the DTC information with a scan
tool. DTCs P0090, P0091, or P0092 should not set.
- 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
- Ignition OFF, disconnect the harness connector at the
Q45A Fuel Rail Pressure Regulator 1.
- Ignition ON, verify a test lamp illuminates between
the ignition 1 voltage circuit terminal 2 and
ground.
| ⇒ |
If the test lamp does not illuminate, repair the
ignition 1 voltage circuit for a short to ground or an
open/high resistance. |
- Ignition ON, test for 3-4 V between the control
circuit terminal 1 and ground.
| ⇒ |
If less than the specified range, test the control
circuit for an open or a short to ground. If the circuit tests
normal, replace the K20 Engine Control Module. |
| ⇒ |
If greater than the specified range, test the
control circuit for a short to voltage. If the circuit tests
normal, replace the K20 Engine Control Module. |
- Ignition OFF, test for less than 5 Ω between the
control circuit terminal 2 and the K20 Engine Control
Module.
| ⇒ |
If greater than the specified range, repair the
control circuit for a high resistance. |
- If all circuits test normal, test or replace the
Q45A Fuel Rail Pressure Regulator 1.
Component Testing
Static Test
- Ignition OFF, disconnect the harness connector at the
Q45A Fuel Rail Pressure Regulator 1.
- Test for 2-4 Ω between the control
terminal 1 and the ignition 1 voltage
terminal 2.
| ⇒ |
If not within the specified range, replace the
Q45A Fuel Rail Pressure Regulator 1. |
- Test for infinite resistance between each terminal and
the Q45A Fuel Rail Pressure Regulator 1 housing.
| ⇒ |
If not the specified value, replace the
Q45A Fuel Rail Pressure Regulator 1. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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