Circuit Description
The fuel supply pump draws fuel from the fuel tank and pumps the high pressure fuel to the fuel rail. The quantity of the fuel discharged from the supply pump controls the pressure in the fuel rail. The suction control valve (SCV) in the fuel supply pump effects this control in accordance with the command received from the engine control module (ECM). The fuel pressure of the high pressure side is measured by the fuel rail pressure sensor. The ECM calculates the fuel feed quantity based on the fuel pressure sensor signal and other many signals. If the ECM detects an excessively large deviation of the fuel feed quantity, this DTC will set.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The deviation of the rail pressure is less than 2 MPa (290 psi). |
| • | The crankshaft position (CKP) sensor is normal. |
| • | The fuel rail pressure sensor is normal. |
| • | The deviation of the fuel quantity is less than 2 mm²/st. |
| • | The engine speed is more than 500 RPM. |
Conditions for Setting the DTC
The deviation of the fuel feed quantity is more than the threshold.
Action Taken When the DTC Sets
| • | The ECM illuminates the malfunction indicator lamp (MIL) and Reduced Engine Power indicator lamp, if fitted, when the diagnostic runs and fails. |
| • | The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records. |
| • | The ECM limits fuel rail pressure for fail-safe operation. |
| • | The ECM closes the exhaust gas recirculation (EGR) valve and holds to close position. |
Condition for Clearing the DTC
| • | A current DTC clears when the ignition is turned OFF. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | If an intermittent condition is suspected, the following may cause an intermittent: |
| - | Poor connections |
| - | A mis-routed harness |
| - | Rubbed through wire insulation |
| - | Broken wire inside the insulation |
| • | Inspect for the following conditions: |
| - | Poor connection at ECM--Inspect the harness connectors for the following conditions: |
| • | Backed-out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal to wire connection |
| - | Damaged harness--Inspect the wiring harness for damage. If the harness appears to be OK, observe the Engine Coolant Temperature display on the scan tool while moving the connectors and the wiring harness related to the sensor. A change in the display will indicate the location of the fault. |
| - | Air in the fuel line |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics | |||
1 | Did you perform the Diagnostic System Check - Engine Controls? | Go to Step 2 | |
2 |
Is DTC P0091, P0092, P0192, P0193, P0201-P0206, P2163-P2166, P2011, or P2012 also set? | Go to Step 3 | |
3 |
Did you find and correct the condition? | Go to Step 8 | Go to Step 4 |
4 |
Did the DTC fail this ignition? | Go to Step 5 | Go to Step 8 |
5 | Replace the supply pump. Refer to Fuel Injection Pump Replacement . Did you complete the replacement? | Go to Step 6 | -- |
6 |
Did the DTC fail this ignition? | Go to Step 7 | Go to Step 8 |
7 |
Important: The new engine control module (ECM) must be programmed. Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data . Did you complete the replacement? | Go to Step 8 | -- |
8 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 9 |
9 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | System OK | |
