DTC P0090, P0091, or P0092
Diagnostic Instructions
DTC Descriptors
| DTC P0090 00: Fuel Pressure Regulator Control
Circuit Malfunction |
| DTC P0091 00: Fuel Pressure Regulator Control
Circuit Low Voltage |
| DTC P0092 00: Fuel Pressure Regulator Control
Circuit High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition
|
P0091 00
|
P0091 00
|
—
|
—
|
Output Control
|
P0091 00
|
P0090 00
|
P0092 00
|
—
|
|
| |
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
| 1. |
Ignition ON, observe the DTC
information with a scan tool. DTCs P0090, P0091, or P0092 should
not set. |
| 2. |
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 Q18A Fuel Pressure Regulator. |
| 2. |
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. |
| 3. |
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 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 circuit tests normal,
replace the K20 Engine Control Module. |
| 4. |
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. |
| 5. |
If all circuits test normal,
test or replace the Q18A Fuel Pressure Regulator. |
Component Testing
Static Test
| 1. |
Ignition OFF, disconnect the
harness connector at the Q18A Fuel Pressure Regulator. |
| 2. |
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
Q18A Fuel Pressure Regulator. |
| 3. |
Test for infinite resistance
between each terminal and the Q18A Fuel Pressure Regulator
housing. |
| ⇒ |
If not the specified value, replace the Q18A Fuel
Pressure Regulator. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
