Performing a crankshaft relearn procedure is sometimes necessary after replacing a crankshaft position sensor or other related components. This guide provides a detailed walkthrough of the process using a Hyper Tough OBDII CAN scan tool. Before starting, ensure no diagnostic trouble codes are present that could prevent the procedure from running.
Pre-Conditions for Crankshaft Relearn
Several critical conditions must be met before initiating the crankshaft relearn procedure. These include ensuring no relevant Diagnostic Trouble Codes (DTCs) are set, and the vehicle’s systems are within specific operating parameters.
Diagnostic Trouble Codes (DTCs) to Check
The following DTCs must not be present: P0335, P0336, P0341, P0342, P0343, P0117, P0118, P1539, P1546, P0705, P0706, P1810, and P1825. These codes relate to various systems, including the crankshaft and camshaft position sensors, engine coolant temperature, transmission, and air conditioning. Clearing these codes beforehand is crucial.
Vehicle Parameter Requirements
Beyond DTCs, these parameters are essential:
- Engine Coolant Temperature (ECT): Must be between 150°F and 220°F.
- RPM: Must be below 2400 RPM before starting.
- Throttle Position Sensor (TPS): Must be at 0%.
- Vehicle Speed Sensor (VSS): Must be at 0 (vehicle stationary).
Vehicle Preparation Steps
Prepare the vehicle as follows:
- Engage Parking Brake: Ensure the parking brake is firmly applied.
- Transmission Position: Place the transmission in Park or Neutral.
- Accessory Shutdown: Turn off all accessories (radio, lights, etc.).
- Brake Pedal: Keep your foot on the brake pedal throughout the initial stages.
Hyper Tough OBDII CAN Crankshaft Relearn Steps
With pre-conditions met, follow these steps using your Hyper Tough OBDII scanner:
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Connect Scan Tool: Connect the scan tool to the vehicle’s OBDII port and establish communication.
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Navigate to DVT Tab: Access the “DVT” (Data Value Table) or equivalent tab on the scanner.
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Select Controller: Choose the appropriate engine controller from the available options.
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Activate Controller: Click the “Activate” button to initiate communication with the selected controller.
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Learning Subtab: Navigate to the “Learning” subtab within the controller’s menu.
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Initiate CASE Learning: Click the “CASE” (Crankshaft Angle Sensor Error) Learn or equivalent option.
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Throttle Activation: Quickly increase engine RPM to above 4000 RPM within 10 seconds. This can be done by opening the throttle.
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Throttle Release: Immediately release the throttle upon hearing or feeling a stumble or misfire.
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Engine Idle: Allow the engine to return to idle speed.
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Engine Shutdown: Turn off the engine and wait for 15 seconds.
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Deactivate Controller: While waiting, you can click “Deactivate” on the scan tool to end the communication with the controller.
Conclusion
Successfully completing the crankshaft relearn procedure is vital for proper engine operation. Following these steps carefully, along with ensuring all pre-conditions are met, should result in a successful relearn. Remember to consult your vehicle’s specific repair manual for detailed instructions and safety precautions. Always prioritize safety when working on your vehicle.
