Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
DTC Descriptors
DTC P0335: Crankshaft Position (CKP) Sensor CircuitDTC P0336: Crankshaft Position (CKP) Sensor Performance
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
CKP Sensor Signal | P0335 | -- | -- | P0336 |
Low Reference | P0335 | -- | -- | P0336 |
Shielded Ground | -- | -- | -- | P0336 |
Circuit/System Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the AC voltage output depends on the crankshaft position and battery voltage. The CKP sensor works in conjunction with a 58X reluctor wheel attached to the crankshaft. The engine control module (ECM) can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP and the camshaft position (CMP) sensor inputs. The CKP sensor is also used to detect misfire and tachometer display. The CKP sensor circuits are connected directly to the ECM. The circuits between the CKP sensor and the ECM consist of the following circuits:
| • | The signal |
| • | The low reference |
| • | The shielded ground |
Conditions for Running the DTC
P0335
| • | The engine is cranking or running. |
| • | The DTC runs continuously once the above condition is met. |
P0336
| • | The engine speed is greater than 512 RPM. |
| • | The DTC runs continuously once the above condition is met. |
Conditions for Setting the DTC
P0335
The ECM does not detect a signal from the CKP sensor.
P0336
The ECM detects more than 2 pulses incorrect at each reference pulse.
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 CKP sensor or the reluctor wheel |
| • | Excessive play or looseness of the CKP sensor or the reluctor wheel |
| • | Improper installation of the CKP sensor or the reluctor wheel |
| • | Foreign material passing between the CKP sensor and the reluctor wheel |
| • | Excessive air gap between the CKP sensor and the reluctor wheel |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electronic Ignition (EI) System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Verification
- Attempt to start the engine. Observe the scan tool DTC information parameter. DTC P0335 and P0336 should not set.
- Move related harnesses/connectors of the CKP sensor. Verify the engine does not stumble, stall, or change engine speed.
- If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the CKP sensor.
- Ignition ON, test for 1.5-3.0 volts between the signal circuit and the low reference circuit.
- If all circuits test normal, test or replace the CKP sensor.
Important: If the CKP sensor lead is damaged in any way, replace the CKP sensor.
| ⇒ | If less than the specified range, test the applicable circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the applicable circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the CKP sensor.
- Test for 460-620 ohms between the signal terminal and low reference terminal.
- Disconnect the fuel pump relay.
- While cranking the engine, test for more than 1.4 ACV between the signal terminal and low reference terminal.
Important: If the CKP sensor lead is damaged in any way, replace the CKP sensor.
| ⇒ | If not within the specified range, replace the CKP sensor. |
| ⇒ | If less than 1.4 ACV, replace the CKP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
