DTC P0490 [MZR-CD (RF Turbo)]

BME010200400216

DTC P0490

EGR solenoid valve (vacuum) control circuit high input

DETECTION CONDITION

• The PCM monitors the output signal to the EGR solenoid valve (vacuum). If the EGR solenoid valve (vacuum) voltage is high even if the EGR solenoid valve (vacuum) is on, the PCM determines that there is a malfunction in the EGR solenoid valve (vacuum) control circuit.
Diagnostic support note
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• EGR solenoid valve (vacuum) malfunction
• Connector or terminal malfunction
• Short to power supply in wiring harness between EGR solenoid valve (vacuum) terminal B and PCM terminal 99
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has 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
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the Drive Mode.
• Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the "INTERMITTENT CONCERN TROUBLESHOOTING".
4
INSPECT EGR SOLENOID VALVE (VACUUM) CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the EGR solenoid valve (vacuum) connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
5
INSPECT EGR SOLENOID VALVE (VACUUM) CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch to the ON position (Engine off).
• Measure the voltage between EGR solenoid valve (vacuum) terminal B (wiring harness-side) and body GND.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No
Go to the next step.
6
INSPECT EGR SOLENOID VALVE (VACUUM)
• Inspect the EGR solenoid valve (vacuum).
• Is there any malfunction?
Yes
Replace the EGR solenoid valve (vacuum), then go to Step 8.
No
Go to the next step.
7
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?
Yes
Repair or replace the terminal, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0490 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the Repair Verification Drive Mode.
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.