Escalade AWD V8-6.2L (2009)
Oil Level Sensor: Testing and Inspection
Engine Oil Level Sensor Diagnosis
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (with HP2) (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic
System Check - Vehicle)Diagnostic System Check - Vehicle (without HP2) (See: Testing and Inspection/Initial Inspection and Diagnostic
Overview/Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine oil level sensor/switch is a normally-closed with proper engine oil level. The switch opens when the engine oil level drops below a calibrated
level. The engine control module (ECM) monitors the engine oil level signal circuit when the ignition is ON, and the engine is OFF. With the switch in
the closed position, the ECM detects a low voltage signal circuit. With the switch in the open position, the ECM detects a high voltage on the signal
circuit. When high voltage is detected on the signal circuit, the ECM will send a serial data message to the instrument panel cluster (IPC) and a message
is displayed on the driver information center (DIC).
The following information determines the message sent from the ECM to the IPC:
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The Engine Oil Level Low message is displayed only after the ECM detects a high voltage on the signal circuit for three consecutive ignition
cycles, followed by an ignition OFF event from 15 minutes to greater than 50 minutes, depending on engine oil temperatures.
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The Engine Oil Level Low message is turned OFF when the ECM detects a low voltage on the signal circuit after an ignition OFF event for greater
than 90 seconds, followed by the ignition ON for less than 1 second.
Reference Information
Schematic Reference
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Engine Mechanical Schematics (See: Diagrams/Electrical Diagrams)
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Instrument Cluster Schematics (See: Diagrams/Electrical Diagrams/Instrument Panel, Gauges and Warning Indicators/System
Diagram/Instrument Cluster Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
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Instrument Cluster Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Instrument Cluster / Carrier/Description
and Operation)
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Indicator/Warning Message Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Description and
