Circuit Description
The crankshaft position (CKP) sensor is a variable reluctance sensor. The CKP sensor 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. The AC voltage output depends on the CKP and the battery voltage. The CKP sensor works in conjunction with a 7X reluctor wheel attached to the crankshaft. The CKP sensor connects to the engine control module (ECM) through the following circuits:
| • | The CKP sensor signal |
| • | The low reference |
If the ECM detects an incorrect number of pulses from the CKP sensor, DTC P0335 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0335 Crankshaft Position (CKP) Sensor Circuit
Conditions for Running the DTC
| • | DTCs P0340 and P0341 are not set. |
| • | The engine is cranking or running. |
| • | The engine speed is less than 6,500 RPM. |
| • | The MAF Sensor parameter is between 0-3 g/s. |
| • | DTC P0335 runs continuously once the above condition is met. |
Conditions for Setting the DTC
| • | The ECM detects an incorrect number of CKP pulses during engine cranking for 4 seconds. |
| • | The ECM detects an incorrect number of CKP pulses while the engine is running for 2 seconds. |
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. |
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. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||||||
Attempt to start the engine. Does the engine crank? | -- | Go to Step 3 | Go to Symptoms - Engine Electrical in Engine Electrical | |||||||||||
3 | Attempt to start the engine. Does the engine start and run? | -- | Go to Step 4 | Go to Step 5 | ||||||||||
4 |
Is the resistance within the specified range? | 500-900 ohms | Go to Intermittent Conditions | Go to Step 12 | ||||||||||
5 |
Does the CKP Active Counter increment? | -- | Go to Step 13 | Go to Step 6 | ||||||||||
6 | Test the signal circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 7 | ||||||||||
7 | Test the low reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 8 | ||||||||||
8 | Test for an intermittent and for a poor connection at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 9 | ||||||||||
9 | Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 | ||||||||||
10 |
Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 | ||||||||||
11 | Inspect the CKP reluctor wheel for the following conditions:
Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 | ||||||||||
12 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||||
13 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||||||
14 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 15 | ||||||||||
15 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK | ||||||||||
