DTC P0090 / P0091 / P0092
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
P0090: Fuel Pressure Regulator1 Control Circuit / Open High pressure fuel pump circuit is open. (1 D/C detection logic) |
•High pressure fuel pump and/or its circuit
•ECM |
|
P0091: Fuel Pressure Regulator1 Control Circuit Low High pressure fuel pump circuit is shorted to ground. (1 D/C detection logic) |
|
|
P0092: Fuel Pressure Regulator1 Control Circuit High High pressure fuel pump circuit is shorted to power supply. (1 D/C detection logic) |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B2: | Fuel pressure sensor signal circuit | 3. | Fuel pressure sensor |
| A1: | High pressure fuel pump power supply circuit | B3: | Fuel pressure sensor ground circuit | 4. | To MAP sensor |
| A2: | High pressure fuel pump drive circuit | 1. | ECM | ||
| B1: | Fuel pressure sensor power supply circuit | 2. | High pressure fuel pump |
DTC Confirmation Procedure
NOTE:
Check that the following condition is met in this “DTC Confirmation Procedure”.
•8.5 V < Battery voltage < 16.5 V
1)Run engine at idle speed.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
High pressure fuel pump power supply circuit and drive circuit check
1)With ignition “OFF”, disconnect “C01” and “E01” connectors of ECM and high pressure fuel pump connector.
2)Check for proper terminal connection to “C01” and “E01” connectors and high pressure fuel pump connector.
3)If connection is OK, check the following points.
•Resistance of “A1” and “A2” circuits: less than 1 Ω
•Resistance between each “A1” and “A2” circuit and ground: infinity •Resistance between “A1” circuit terminal and “A2” circuit terminal at high pressure fuel pump connector: infinity •Voltage of “A1” and “A2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
|
Go to Step 3.
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Repair or replace defective wire harness.
|
| 3 |
High pressure fuel pump check
1)Check high pressure fuel pump.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace high pressure fuel pump.
|