Diagnostic guide for P0335

Diagnostic Guide for P0335 - Crankshaft Position Sensor Circuit

The P0335 code indicates an issue with the crankshaft position sensor circuit, which is crucial for engine timing and performance. This guide aims to help diagnose the underlying cause of the code to restore proper engine function.

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Difficulty

Intermediate

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Estimated Time

30-60 Minutes

Estimated Diagnostic Cost

$0-$100

Typical shop charge to perform this diagnostic process. Repair parts and labor are not included.

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Tools Needed

OBDII scanner, multimeter, wiring diagram, basic hand tools

Safety Notes

Ensure the engine is off and cool before starting. Use caution when working around moving parts and electrical systems. Disconnect the battery when inspecting wiring.

Step 1

Check for Additional Codes

Instruction Use an OBDII scanner to check for any additional trouble codes that may be present.

Expected result A list of trouble codes, including P0335.

If Pass If no additional codes are found, proceed to inspect the crankshaft position sensor and its wiring.

If Fail If other codes are present, address those issues first as they may be related.

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Step 2

Inspect the Crankshaft Position Sensor Wiring

Instruction Visually inspect the wiring and connectors leading to the crankshaft position sensor for any signs of damage, corrosion, or loose connections.

Expected result Wiring and connectors appear intact and secure.

If Pass If the wiring looks good, proceed to test the sensor's voltage output.

If Fail If damage is found, repair or replace the affected wiring or connectors.

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Step 3

Test the Crankshaft Position Sensor Output

Instruction Using a multimeter, measure the voltage output of the crankshaft position sensor while cranking the engine.

Expected result A fluctuating voltage signal indicating the sensor is functioning.

If Pass If a proper signal is detected, the sensor is likely functioning correctly; check the ECM next.

If Fail If no signal or a constant voltage is detected, the sensor may be faulty and should be replaced.

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Step 4

Check the Crankshaft Position Sensor Ground

Instruction Verify that the crankshaft position sensor has a good ground connection by testing the ground wire with a multimeter.

Expected result A reading close to zero ohms indicating a good ground.

If Pass If the ground is good, the issue may lie within the ECM or other components.

If Fail If the ground is poor, repair the ground connection to ensure proper sensor operation.

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Step 5

Inspect the ECM and Related Circuits

Instruction Check the Electronic Control Module (ECM) and related circuits for any signs of damage or corrosion.

Expected result The ECM and circuits appear in good condition.

If Pass If everything looks good, further diagnostics may be needed to determine if the ECM is faulty.

If Fail Repair or replace any damaged components found in this step.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.