Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSOLDSMOBILE1998EIGHTY-EIGHT V6-3.8L VIN KREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSEGR VALVE POSITION SENSORDESCRIPTION AND OPERATION
1998 Oldsmobile Eighty-Eight V6-3.8L VIN K
EGR Valve Position Sensor: Description and Operation
1998 Oldsmobile Eighty-Eight V6-3.8L VIN KSECTION Description and Operation
DESCRIPTION
The PCM monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM and to detect a fault if the pintle position sensor circuit is open or shorted. If the PCM detects an excessively low EGR Feedback signal voltage (pintle position feedback open or shorted), DTC P0405 will set.
OPERATION
The Linear EGR valve is controlled by using an ignition positive driver and ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the ignition positive or ground circuit. If an electrical malfunction occurs, DTC P0403 will set.
When the ignition switch is turned ON, the PCM learns the EGR closed valve pintle position. When the PCM commands the EGR valve closed, the learned EGR closed valve pintle position is compared to the Actual EGR position. If the Actual EGR position indicates that the EGR valve is still open, DTC P1404 will set.
When the PCM commands the EGR valve open, Actual EGR Position is compared with Desired EGR Position. If Actual EGR Position is 15% less than Desired EGR position when the PCM is commanding the EGR valve opened, DTC P0404 will set.
The PCM monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM and to detect a fault if the pintle position sensor circuit is open or shorted. If the PCM detects an excessively low EGR Feedback signal voltage (pintle position feedback open or shorted), DTC P0405 will set.
OPERATION
The Linear EGR valve is controlled by using an ignition positive driver and ground circuit within the PCM. The driver has the ability to detect an electrical malfunction in the ignition positive or ground circuit. If an electrical malfunction occurs, DTC P0403 will set.
When the ignition switch is turned ON, the PCM learns the EGR closed valve pintle position. When the PCM commands the EGR valve closed, the learned EGR closed valve pintle position is compared to the Actual EGR position. If the Actual EGR position indicates that the EGR valve is still open, DTC P1404 will set.
When the PCM commands the EGR valve open, Actual EGR Position is compared with Desired EGR Position. If Actual EGR Position is 15% less than Desired EGR position when the PCM is commanding the EGR valve opened, DTC P0404 will set.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.