For 1990-2009 cars only
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 5-Volt Reference Voltage | P0642, P0643 | P0335, P0336 | P0335, P0336, P0341, P0642, P0643 | P0336 |
CKP Sensor Signal | P0335, P0336 | P0335, P0336 | P0335, P0336 | P0336 |
CKP Low Reference | -- | P0335, P0336 | -- | P0336 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: Engine Running | ||||
CKP 5-Volt Reference Voltage | Present | No | No | No |
CKP Sensor Signal | Present | No | No | No |
CKP Low Reference | Present | -- | No | No |
Circuit/System Description
The hall effect crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. There are 57 teeth on the front of the crankshaft sprocket, plus a sync gap. The CKP sensor will output an ON/OFF pulse as each window passes the sensing element. The CKP sensor is connected directly to the engine control module (ECM) by the following circuits:
| • | The 5-volt reference circuit |
| • | The low reference circuit |
| • | The signal circuit |
Conditions for Running the DTC
P0335
| • | The engine is cranking or running. |
| • | The camshaft position (CMP) sensor signal is present. |
| • | DTC P0335 runs continuously when the above conditions are met. |
P0336
| • | The engine is cranking or running. |
| • | DTC P0336 runs continuously when the above condition is met. |
Conditions for Setting the DTC
P0335
The ECM determines no signal from the CKP sensor for less than 8 seconds.
P0336
The ECM determines that the CKP sensor signal is out of range for less than 2 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | An intermittent CKP sensor signal may cause DTC P0336 to set. Wiggle the wiring harness with the engine running and observe the CKP Sensor Pulses Missed parameter on the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition. |
| • | Inspect for insufficient fuel. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- If DTCs P0642 or P0643 are set, diagnose those DTCs first.
- The engine starts and runs.
- Engine running, observe the DTC information with a scan tool. DTCs P0335 or P0336 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
- With the key ON and the CKP sensor disconnected, measure the voltage between the 5-volt reference and a good ground and observe that the DMM measures 4.98-5.02 volts.
- With the key ON and the CKP sensor disconnected, measure the voltage between the 5-volt reference circuit and the low reference circuit, and observe that the DMM measures 4.98-5.02 volts.
- With the key ON and the CKP sensor disconnected, connect a fused jumper wire to the signal circuit and momentarily and repeatedly probe the low reference circuit, and observe that the Crank Signal Present and engine RPM parameters change.
- Ensure that the CKP sensor circuits are not routed too closely to the fuel injector wiring, after-market add-on electrical equipment, solenoids, relays, or motors.
- Inspect the CKP sensor for physical damage, loose or improper installation, excessive air gap, or foreign material passing between the sensor and the reluctor wheel.
- Inspect the CKP reluctor wheel for physical damage, improper installation, or excessive endplay or looseness.
- If no other condition is found, replace the CKP sensor.
| ⇒ | If the DMM does not measure 4.98-5.02 volts, test the 5-volt reference for an open or high resistance. If the circuits test normal, replace the control module. |
| ⇒ | If the DMM does not measure 4.98-5.02 volts, test the low reference for an open or high resistance. If the circuits test normal, replace the control module. |
| ⇒ | If the crank signal parameter and engine RPM does not change, test the signal circuit for an open, high resistance, a short to ground, a short to voltage. If the circuits test normal, replace the control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
