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.
Crankshaft Position Sensor
- Disconnect the ground cable from battery. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
- Prepare an oscilloscope.
- Disconnect the connector from ECM in numerical order as shown in the figure.
- Attach the ST between the ECM, engine wiring harness and the bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD
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Special Tool:
CHECK BOARD (18460AA150)
- Connect the probe to ST.
Terminal No. Probe (E159) No. 14 + (B134) No. 40 - - Start the engine and let it idle.
- Check the waveforms and voltage.NOTE: For waveform and voltage, refer to "Control Module (ECM) I/O Signal". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>CONTROL MODULE I/O SIGNAL>ELECTRICAL SPECIFICATION .
- After inspection, install the related parts in the reverse order of removal.NOTE: For installation procedures of ECM connectors, refer to Engine Control Module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>INSTALLATION .
Use the Manual With the Right Hardware
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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.
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