DTC P0033 [MZ-CD 1.6 (Y6) (EURO4 emission level)]

id0102g6828400

DTC P0033

Air bypass valve actuator control circuit open
DETECTION CONDITION
•  The PCM monitors the air bypass valve actuator control signal circuit at PCM terminal 248. If the PCM detects that air bypass valve actuator control circuit is no load for 2 s when the PCM duty-controls the air bypass valve actuator, the PCM determines that there is an open circuit in the air bypass valve actuator control circuit.
POSSIBLE CAUSE
•  Air bypass valve connector or terminal malfunction
•  Open circuit in wiring harness between main relay and air bypass valve terminal C
•  Short to ground in wiring harness between ENG INJ fuse and air bypass valve terminal C
•  PCM connector or terminal malfunction
•  Open circuit in wirning harness between air bypass valve terminal D and PCM terminal 248
•  Air bypass valve actuator malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT AIR BYPASS VALVE CONNECTOR CONDITION
•  Switch the ignition to OFF.
•  Disconnect the aie bypass valve connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 7.
No
Go to the next step.
4
INSPECT AIR BYPASS VALVE ACTUATOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND
•  Air bypass valve connector is disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the air bypass valve terminal C (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Verify the ENG INJ fuse condition.
•  If the ENG INJ fuse is blown, repair or replace wiring harness for a possible short to ground circuit.
•  If the ENG INJ fuse is normal, repair or replace wiring harness for a possible open circuit.
Then go to Step 7.
5
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 7.
No
Go to the next step.
6
INSPECT AIR BYPASS VALVE ACTUATOR CONTROL SIGNAL CIRCUIT FOR OPEN
•  Air bypass valve and PCM connectors are disconnected.
•  Inspect for continuity between air bypass valve terminal D (wiring harness-side) and PCM terminal 248 (wiring harness-side).
•  Is there any continuity?
Yes
Replace the EGR throttle valve component, then go to the next step.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
7
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?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
No
DTC troubleshooting completed.