PRE-RELEASE
DTC P0033-P0035
| DTC P0033-P0035 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P0033
Turbocharger Bypass Solenoid Valve Control Circuit
DTC P0034
Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage
DTC P0035
Turbocharger Bypass Solenoid Valve Control Circuit High Voltage
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Ignition Voltage | P0010, P0030, P0033, P0034, P0134, P0245, P0458, P2088, P2090, P2092, P2094* | P0010, P0030, P0033, P0034, P0134, P0245, P0458, P2088, P2090, P2092, P2094 | - | - |
| Turbocharger Bypass Solenoid Valve Control Circuit | P0034 | P0033 | P0035 | - |
| *Opens the fuse that supplies voltage to the turbocharger bypass solenoid. | ||||
| Circuit/System Description |
The turbocharger bypass solenoid valve is used to prevent the turbo from exceeding the pump limit at low flow and high pressure. This occurs when the engine is running with a load and the throttle suddenly closes. In this case, flow is almost null and pressure is very high. This not only is damaging to the turbocharger, but also generates noise and decelerates turbine speed. Ignition voltage is supplied directly to the bypass solenoid valve and the engine control module (ECM) controls the valve by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.
| Conditions for Running the DTC |
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The engine speed is greater than 80 RPM.
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The ignition voltage is between 10-18 V.
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The ECM has commanded the bypass solenoid valve ON and OFF at least once during the ignition cycle.
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The DTCs run continuously once the above conditions are met.
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| Conditions for Setting the DTC |
P0033
The ECM detects the bypass solenoid valve control circuit is open.P0034
The ECM detects the bypass solenoid valve control circuit is shorted to ground.P0035
The ECM detects the bypass solenoid valve control circuit is shorted to voltage.| Action Taken When the DTC Sets |
DTC P0033, P0034, and P0035 are Type B DTCs.
| Conditions for Clearing the DTC |
DTC P0033, P0034, and P0035 are Type B DTCs.
| Diagnostic Aids |
If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the circuit status for the component with a scan tool. The circuit status parameter changes from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.
| Reference Information |
Schematic Reference
Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Turbocharger System Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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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. Verify that DTC P0234, P0299, P0236, P0237, P0238, P0244, P0245, or P0246 is not set. |
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| 2. |
If a DTC is set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
for further diagnosis.
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| 3. |
Ignition ON, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool. You should hear an audible click.
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| 4. |
Engine running, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool while observing the following control circuit status parameters:
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Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
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Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status
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Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status
The parameters should alternate between OK and Not Run with each change in command. |
| 5. |
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.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the Q40 turbocharger bypass solenoid valve.
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| 2. |
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
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| 3. |
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
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| 4. |
Connect a test lamp between the control circuit terminal 2 and the ignition circuit terminal 1.
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| 5. |
Command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool, then select exit. The test lamp should illuminate and then go OFF. |
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| 6. |
If the test lamp is always ON, test the control circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 ECM.
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| 7. |
If the test lamp is always OFF, test the control circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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| 8. |
Test for 2.6-4.6 V between the control circuit terminal 2 and ground.
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| 9. |
If the voltage is not within the specified range, replace the K20 ECM.
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| 10. |
If all circuits test normal, test or replace the Q40 turbocharger bypass solenoid valve.
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| Component Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the Q40 turbocharger bypass solenoid valve.
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| 2. |
Test for 12-60 Ω between the control terminal 2 and the ignition terminal 1 of the Q40 turbocharger bypass solenoid valve .
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| 3. |
If not within the specified range, replace the Q40 turbocharger bypass solenoid valve .
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| 4. |
Test for infinite resistance between each terminal and the Q40 turbocharger bypass solenoid valve housing.
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| 5. |
If not the specified value, replace the Q40 turbocharger bypass solenoid valve .
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Turbocharger Disassemble
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Control Module References
for engine control module replacement, setup, and programming
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