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 provides 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 CKP sensor signal |
| • | The low reference |
| • | The shielded ground |
Conditions for Running the DTC
P0335
| • | DTCs P0016 and P0340 are not set. |
| • | The engine is cranking. |
| • | The manifold absolute pressure (MAP) does not change greater than 0.6 volt or 1.2 kPa for a manual transmission, or 1.2 volts or 0.8 kPa for an automatic transmission, during crank. |
| • | The DTC runs continuously when the above conditions are met. |
P0336
| • | The engine is running. |
| • | The DTC runs continuously when 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 an incorrect number of CKP reference pulses for 10 consecutive crankshaft revolutions.
Action Taken When the DTC Sets
| • | DTC P0335 is a Type A DTC. |
| • | DTC P0336 is a Type B DTC. |
Conditions for Clearing the DTC
| • | DTC P0335 is a Type A DTC. |
| • | DTC P0336 is a Type B DTC. |
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
Control Module References for scan tool information
Circuit/System Verification
- Attempt to start the engine. Observe the DTC information with a scan tool. DTCs P0335 and P0336 should not set.
- Move related harnesses/connectors of the CKP 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 CKP sensor.
- Ignition ON, test for 1.5-2.0 volts between the signal circuit terminal 1 and ground.
- Ignition ON, test for 1.5-2.0 volts between the low reference circuit terminal 2 and ground.
- 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 signal 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 signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the low reference 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 low reference 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 1 and the low reference terminal 2.
- Disconnect the fuel pump relay.
- Set the DMM to the AC voltage scale.
- Engine cranking, test for greater than 1.4 ACV between the signal terminal 1 and the low reference terminal 2.
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 the specified range, replace the CKP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
