Diagnostic Instructions
DTC Descriptor
DTC P0335: Crankshaft Position (CKP) Sensor Circuit
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
5-Volt Reference Circuit
| P0335, P0651
| P0335, P0336
| P0651
| --
|
CKP Sensor Signal Circuit
| P0335
| P0335
| P0335
| P0336
|
Low Reference Circuit
| P0335
| P0335
| --
| --
|
Circuit/System Description
The crankshaft position (CKP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP sensor is an internally magnetic biased digital output integrated circuit
sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The CKP sensor
produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP sensor sends a digital signal, which represents an image of
the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information
is then used to determine the optimum ignition and injection points of the engine. The ECM also uses CKP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.
Conditions for Running the DTC
• | DTC P0340, P0341, P0641 or P0651 is not set. |
• | The engine is cranking or running. |
• | The DTC runs continuously when the above conditions are met. |
Conditions for Setting the DTC
P0335
| Important: The ECM detects engine movement by sensing the airflow through the MAF sensor is more than 3 g/s, or by sensing camshaft position (CMP) sensor pulses.
|
• | The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 seconds without a CKP sensor pulse. |
• | The ECM detects that the engine is running, but does not receive a CKP sensor pulse for 2 of 10 engine revolutions. |
• | The ECM detects that the engine is running, but does not sync. |
Action Taken When the DTC Sets
• | The control module illuminates the malfunction indicator lamp
(MIL) on the second consecutive ignition cycle that the diagnostic runs and
fails. |
• | The control module records the operating conditions at the time
the diagnostic fails. The first time the diagnostic fails, the control module
stores this information in the Failure Records. If the diagnostic reports
a failure on the second consecutive ignition cycle, the control module
records the operating conditions at the time of the failure. The control
module writes the operating conditions to the Freeze Frame and updates
the Failure Records. |
Action Taken When the DTC Sets
DTC P0335 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0335 is a Type B DTC.
Diagnostic Aids
Inspect the CKP sensor connector and the ECM connector for corrosion.
Reference Information
Schematic Reference
Engine Controls Schematics
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
- Ignition OFF, inspect the engine wiring harness carrying the CKP sensor circuits for the following conditions:
• | Close routing of aftermarket electrical equipment |
• | Close to solenoids, motors, and relays |
⇒ | Correct any wire harness routing or component placement conditions, if it is determined to be a possible source of electrical interference. |
- Start the engine. Observe the Engine Speed parameter with the scan tool. The parameter should display the current engine speed matching the CMP Sensor parameter.
⇒ | If the Engine Speed parameter displays a value other than the current engine speed, continue with Circuit/System Testing. |
- With the engine running, observe the CKP Active Counter parameter with the scan tool. The counter should increment from 0-255 and over again as the CKP sensor pulses are counted.
⇒ | If the CKP Active Counter displays a value of 0, or a fixed value, continue with Circuit/System Testing. |
- Turn OFF the ignition for 60 seconds.
- Start the engine. Do not cycle the ignition until this test is completed.
- Operate the vehicle in various operating conditions within the Conditions for Running the DTC and observe the CKP Resync Counter parameter with the scan tool. The CKP Resync Counter should remain at 0 counts.
⇒ | If the CKP Resync Counter increments, continue with Circuit/System Testing. |
- Engine running, observe the DTC information with a scan tool. DTC P0335 should not set.
- Operate the vehicle within the Conditions for Running the DTC. 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.
- Test for less than 1 ohm of resistance between the CKP low reference circuit terminal B and ground.
⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
- Ignition ON, test for 4.8-5.2 volts between the CKP 5-volt reference circuit terminal A and ground.
⇒ | If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
- Ignition ON, test for 4.8-5.2 volts between the CKP signal circuit terminal C and ground.
⇒ | If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM. |
- Ignition ON, connect a test lamp between the CKP signal circuit terminal C and ground. The test lamp should not illuminate.
⇒ | If the test lamp illuminates, test the CKP signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
- Ignition OFF, connect a fused jumper wire to the CKP signal circuit terminal C.
- Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CKP Active counter parameter should increment.
⇒ | If the CKP active counter increments, replace the CKP sensor. |
⇒ | If the CKP active counter does not increment, replace the ECM. |
Component Testing
Important: You must perform the Circuit/System Testing before proceeding with Component Testing.
- Inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine and inspect the sensor O-ring for damage.
⇒ | If the sensor is loose, incorrectly installed, or damaged, replace the CKP sensor. |
- Connect the CKP sensor harness connector to the CKP sensor.
- Ignition ON, engine OFF, observe the CKP Active counter parameter on the scan tool.
- Pass a flat steel object across the tip of the sensor repeatedly. The CKP Active counter parameter should increment with each pass of the steel object.
⇒ | If the parameter does not increment, replace the CKP sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.