| DTC P0033 | Air bypass valve position sensor open circuit |
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DETECTION CONDITION
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• The PCM monitors the input voltage from the air bypass valve position sensor. If the voltages at PCM terminal 233 deviates from the threshold, the PCM determines that the there is an air bypass valve position sensor circuit problem.
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POSSIBLE CAUSE
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• Air bypass valve position sensor malfunction
• Connector or terminal malfunction
• Open circuit in the wiring harness between air bypass valve position sensor terminal F and PCM terminal 206
• Open circuit in the wiring harness between air bypass valve position sensor terminal A and PCM terminal 233
• Open circuit in the wiring harness between air bypass valve position sensor terminal B and PCM terminal 105
• PCM malfunction
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Diagnostic procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the M-MDS to the DLC-2.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
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4
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CLASSIFY MALFUNCTION AS AIR BYPASS VALVE POSITION SENSOR POWER SUPPLY CIRCUIT MALFUNCTION OR OTHER MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between air bypass valve position sensor terminal F (wiring harness-side) and body ground.
• Is the voltage approx. 5V?
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Yes
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Go to Step 6.
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No
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Go to the next step.
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5
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CLASSIFY MALFUNCTION AS AIR BYPASS VALVE POSITION SENSOR POWER CIRCUIT OR OTHER MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 206 (wiring harness-side) and body ground.
• Is the voltage approx. 5V?
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Yes
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Repair or replace the wiring harness for an open circuit between air bypass valve terminal F and PCM terminal 206, then go to Step 13.
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No
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Go to Step 10.
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6
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CLASSIFY MALFUNCTION AS INSPECT AIR BYPASS VALVE POSITION SENSOR GROUND CIRCUIT MALFUNCTION OR OTHER MALFUNCTION
• Turn the engine switch off.
• Inspect for continuity between air bypass valve position sensor terminal B (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Go to Step 8.
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No
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Go to the next step.
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7
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CLASSIFY MALFUNCTION AS AIR BYPASS VALVE POSITION SENSOR GROUND CIRCUIT OR OTHER MALFUNCTION
• Turn the engine switch off.
• Inspect for continuity between PCM terminal 105 (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for an open circuit between air bypass valve terminal B and PCM terminal 105, then go to Step 13.
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No
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Go to Step 10.
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8
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CLASSIFY MALFUNCTION AS INSPECT AIR BYPASS VALVE POSITION SENSOR SIGNAL CIRCUIT MALFUNCTION OR OTHER MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between air bypass valve position sensor terminal A (wiring harness-side) and body ground.
• Is the voltage between 0.5-4.6V?
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Yes
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Go to the next step.
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No
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Go to Step 11.
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9
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CLASSIFY MALFUNCTION AS AIR BYPASS VALVE POSITION SENSOR SIGNAL CIRCUIT OR OTHER MALFUNCTION
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between PCM terminal 233 (wiring harness-side) and body ground.
• Is the voltage between 0.5-4.6V?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for an open circuit between air bypass valve terminal A and PCM terminal 233, then go to Step 13.
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10
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INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 13.
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No
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Go to the Step 13.
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11
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INSPECT AIR BYPASS VALVE POSITION SENSOR CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the air bypass valve connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 13.
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No
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Go to the next step.
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12
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INSPECT AIR BYPASS VALVE POSITION SENSOR
• Inspect the air bypass valve position sensor.
• Is there any malfunction?
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Yes
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Replace the air pipe (air bypass valve and intake throttle valve component), then go to the next step.
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No
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Go to the next step.
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13
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VERIFY THAT DTC P0033 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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14
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VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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