DTC P0335
Diagnostic Instructions
DTC Descriptor
DTC P0335 28: Crankshaft Position Sensor Circuit Incorrect Frequency
DTC P0335 29: Crankshaft Position Sensor Circuit Too Few Pulses
Circuit/System Description
The crankshaft position sensor is located on the left rear of the engine block. The crankshaft position sensor produces an AC voltage of different amplitude and frequency depending on the velocity of the crankshaft. The crankshaft position sensor works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel are spaced 6 degrees apart with one span having a 12 degree space. The engine control module (ECM) uses the 12 degree space to determine top dead centre for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the crankshaft position sensor and the camshaft position (CMP) sensors. The ECM can synchronise the ignition timing and fuel injector timing based on the CKP sensor and the CMP sensor inputs.
Conditions for Running the DTC
• | The engine is cranking or running. |
• | The DTCs run continuously once the above condition is met for greater than 5 s. |
Conditions for Setting the DTC
P0335, P0335 29
The ECM does not detect a signal from the crankshaft position sensor. OR, the ECM detects a crankshaft position signal without reference pulse.
P0335 28, P0336
The ECM re-syncs the engine position during an ignition cycle.
Action Taken When the DTC Sets
DTCs P0335 and P0336 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0335 and P0336 are Type B DTCs.
Diagnostic Aids
The following conditions could also set the DTCs:
• | Physical damage to the crankshaft position sensor or the reluctor wheel |
• | Excessive play or looseness of the crankshaft position sensor or the reluctor wheel |
• | Improper installation of the crankshaft position sensor or the reluctor wheel |
• | Foreign material passing between the crankshaft position sensor and the reluctor wheel |
• | Excessive air gap between the crankshaft position sensor and the reluctor wheel |
• | The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition. |
Reference Information
Schematic Reference
Engine Controls Schematics : LLW
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Clear the DTC Info with a scan tool. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335 should not set.
- Move related harnesses/connectors of the B26 Crankshaft Position Sensor and verify the engine does not stumble, stall, or change engine speed.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor.
- Ignition ON, test for 2-3 V between the high signal circuit terminal 1 and ground.
⇒ | If less than the specified range, test the high signal circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
⇒ | If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
- Ignition ON, test for 2-3 V between the low signal circuit terminal 2 and ground.
⇒ | If less than the specified range, test the low signal circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
⇒ | If greater than the specified range, test the low signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
- If all circuits test normal, test or replace the B26 Crankshaft Position Sensor.
Component Testing
- Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor.
Note: If the Crankshaft Position Sensor lead is damaged in any way, replace the B26 Crankshaft Position Sensor.
- Test for 700-1200 Ω between the high signal terminal 1 and the low signal terminal 2.
⇒ | If not within the specified range, replace the B26 Crankshaft Position Sensor. |
- Set the DMM to the AC voltage scale.
- Engine cranking, test for greater than 1.3 V AC between the high signal terminal 1 and the low signal terminal 2.
⇒ | If less than the specified range, replace the B26 Crankshaft Position Sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
© Copyright Chevrolet. All rights reserved |