Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor circuits are connected directly to the powertrain control module (PCM) and consists of the following circuits:
| • | The 12-volt reference circuit |
| • | The low reference circuit |
| • | The CKP sensor signal circuit |
If the PCM determines there is no signal from the CKP sensor for 8 seconds, DTC P0335 sets.
Conditions for Running the DTC
| • | DTCs P0101, P0102 , P0103, P0341, P0342, or P0343 are not set. |
| • | The camshaft position (CMP) sensor is transitioning. |
| • | The mass air flow (MAF) is more than 3 g/s. |
| • | The ignition switch is in the Crank mode. |
Conditions for Setting the DTC
The PCM determines there is no signal from the CKP sensor 8 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. |
Diagnostic Aids
The following conditions may cause this DTC to set:
| • | Any poor connections or poor terminal tension at the sensor. Refer to Testing for Intermittent Conditions and Poor Connections Wiring Repairs in Wiring Systems. |
| • | Any crankshaft reluctor wheel damage or improper installation |
| • | The CKP sensor coming in contact with the reluctor wheel |
| • | The engine running out of fuel |
Excess crankshaft end play causes the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in any one of the following conditions:
| • | A no start |
| • | A start and stall |
| • | Erratic performance |
For an intermittent, refer to Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the fault is present.
-
This step simulates a CKP sensor signal to the PCM. If the PCM receives the signal, the fuel pump will operate for about two seconds.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||||
2 | Does the engine start and continue to run? | -- | Go to Step 3 | Go to Step 4 | ||||||||
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids | |||||||||
4 |
Is the voltage near the specified value? | B+ | Go to Step 5 | Go to Step 7 | ||||||||
5 | Measure the voltage between the 12-volt reference of the CKP sensor and the low reference circuit of the CKP sensor with a DMM. Is the voltage near the specified value? | B+ | Go to Step 6 | Go to Step 8 | ||||||||
Momentarily connect a test lamp between the CKP sensor signal circuit and the 12-volt reference of the CKP sensor. Does the fuel pump operate when the test lamp is applied to the CKP sensor signal circuit? | -- | Go to Step 10 | Go to Step 9 | |||||||||
7 | Test the 12-volt reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct condition? | -- | Go to Step 16 | Go to Step 13 | ||||||||
8 | 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 16 | Go to Step 13 | ||||||||
9 | Test the CKP sensor 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 16 | Go to Step 13 | ||||||||
10 |
Important: The CKP system variation learn procedure must be performed anytime the relationship between the CKP sensor and the CKP reluctor wheel is changed.
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||||
11 | Visually inspect the CKP sensor reluctor wheel for damage or looseness. Refer to Crankshaft and Bearing Removal in Engine Mechanical. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||||
12 | Test for poor connections at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||
13 | Test for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. 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 Powertrain Control Module Replacement . 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 | |||||||||
