Circuit Description
The powertrain control module (PCM) uses the crankshaft position (CKP) sensor to detect crankshaft speed and position. The CKP sensor connects to the PCM through the following circuits:
| • | The 12-volt reference circuit |
| • | The low reference circuit |
| • | The CKP sensor 1 signal circuit |
If the PCM detects no signal from the CKP sensor for more than 3 seconds, 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 P0101, P0102, P0103, P0341 are not set. |
| • | The camshaft position (CMP) sensor is incrementing. |
| • | The mass air flow (MAF) is more than 3 g/s while the engine is cranking. |
| • | The MAF is more than 5 g/s while the engine is running. |
Conditions for Setting the DTC
The PCM detects no signal from the CKP sensor for more than 3 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. |
Step | Action | Values | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views | ||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||
2 | Attempt to start the engine. Does the engine start and run? | -- | Go to Step 3 | Go to Step 4 | ||||||||||||
3 |
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | ||||||||||||
4 |
Important: An internally shorted camshaft position (CMP) sensor can cause DTC P0335 to set. Test this circuit for a short to ground before proceeding with this diagnostic table. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Does the DMM display the specified value? | B+ | Go to Step 5 | Go to Step 7 | ||||||||||||
5 | Measure the voltage between the CKP sensor 12-volt reference circuit and the CKP sensor low reference circuit with the DMM. Refer to Circuit Testing and Wiring Repairs . Does the DMM display the specified value? | B+ | Go to Step 6 | Go to Step 8 | ||||||||||||
6 |
Is the duty cycle within the specified range? | 40-60% | Go to Step 9 | Go to Step 10 | ||||||||||||
7 | Test for an open or a short to ground in the CKP sensor 12-volt reference circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||||||
8 | Test for an open in the CKP sensor low reference circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||||||
9 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||||||
10 | Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||||||||
11 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||||||
12 | Visually inspect the CKP reluctor wheel for the following conditions:
Refer to Crankshaft Position Sensor Reluctor Ring Replacement . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||||||
13 | Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals . Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||
14 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||
15 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||
16 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 17 | ||||||||||||
17 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||||||||
