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
DTC P0338: Crankshaft Position (CKP) Sensor Circuit High Duty Cycle
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | P0122, P0222, P0335, P0698, P2127 | P0335, P0697 | P0335, P0338, P0699 | P0336, P0697, P0698, P0699 |
CKP Sensor Signal | P0122, P0222, P0335, P0698, P2127 | P0335 | P0335, P0338, P0699 | P0336, P0698, P0699 |
Low Reference | P0335 | P0335 | -- | P0336 |
Circuit/System Description
The crankshaft position (CKP) sensor is located on the rear of bank 1 of the engine block. The CKP sensor is a hall effect switch that works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is 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 center (TDC) for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the CKP sensor and the camshaft position (CMP) sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the CMP sensor inputs.
Conditions for Running the DTC
| • | The engine is cranking or operating. |
| • | The ECM has detected greater than 12 camshaft revolutions. |
| • | The DTC P0335 and P0336 run continuously once the above conditions are met for greater than 5 seconds. |
| • | The DTC P0338 runs once each engine revolution once the above conditions are met for greater than 2 seconds. |
Conditions for Setting the DTC
P0335
| • | The ECM does not detect a signal from the CKP sensor. |
| OR |
| • | The ECM detects a CKP signal without a reference pulse for greater than 6 revolutions. |
P0336
| • | The ECM re-syncs the engine position greater than 2,600 times during an ignition cycle. |
| OR |
| • | The ECM detects 28 or more interruptions in the engine speed signal during an ignition cycle. |
P0338
The ECM detects a difference of greater than 250 teeth between reference gap position pulses.
Action Taken When the DTC Sets
DTCs P0335, P0336, and P0338 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0335, P0336, and P0338 are Type A 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 |
| • | The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition. |
| • | The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then calculates engine speed from one of the camshaft position sensors. |
| • | An intermittent condition in the camshaft position (CMP) sensor circuits can cause a CKP DTC to set. Inspect the CMP sensor, harness connections, and related wiring, if you suspect this condition. |
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
- Ignition ON, observe the DTC information with a scan tool. DTC P0697, P0698, or P0699 should not be set.
- Clear the DTC Info with a scan tool. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335, P0336, or P0338 should not set.
- Observe the scan tool CKP Resync parameter, the parameter should always display zero. Move the related harnesses/connectors of the CKP sensor while observing the parameter, verify the engine does not stumble, or stall, and the parameter does not increment.
- 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.
| ⇒ | If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699. |
Circuit/System Testing
- Ignition OFF, remove the fuse that supplies B+ to terminal X2-56 of the ECM.
- Disconnect the harness connector at the crankshaft position (CKP) sensor.
- Test for 5 Ω or less between the low reference circuit terminal 1 and ground.
- Install the fuse that supplies B+ to terminal X2-56 of the ECM.
- Ignition ON, test for greater than 4.8 V between the 5-volt reference circuit terminal 3 and the low reference circuit terminal 1.
- Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
- If all circuits/connections test normal, test or replace the CKP sensor.
| ⇒ | If greater than the specified range, test for an open/high resistance in the low reference circuit. If the circuits/connections test normal, replace the ECM. |
| ⇒ | If less than the specified value, test the 5-volt reference circuit for a short to ground or for an open/high resistance. If the circuits/connections test normal, replace the ECM. |
| ⇒ | If greater than the specified value, test the 5-volt reference circuit for a short to voltage. If the circuits/connections test normal, replace the ECM. |
| ⇒ | If the voltage is greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the ECM. |
| ⇒ | If the voltage is less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If circuit/connections test normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
