Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor is 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 |
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 in the crank mode. |
| • | The MAF is more than 5 g/s in the running mode. |
Conditions for Setting the DTC
The PCM determines 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. |
Diagnostic Aids
The following conditions may cause this DTC to set:
| • | Poor connections/terminal tension at the sensor. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | Crankshaft reluctor wheel damage or improper installation |
| • | Excessive air gap between the CKP sensor and the reluctor wheel |
| • | The engine running out of fuel |
| • | Foreign material passing between the sensor and the reluctor wheel |
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 condition, refer to Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step determines if the fault is present.
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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.
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The CKP system variation learn procedure must be performed anytime the relationship between the CKP sensor and the CKP reluctor wheel is changed.
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The CKP system variation learn procedure must be performed anytime the relationship between the CKP sensor and the CKP reluctor wheel is changed.
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 | ||||||
Does the DTC fail this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids | |||||||
4 |
Caution: Before proceeding, remove the fuses for the ignition coil and fuel injector feed circuits in order to prevent personal injury from engine rotation, sparks, and excessive engine fueling.
Important: An internally shorted CAM sensor can cause DTC P0335 to set. Test this circuit for a short before proceeding with this diagnostic table. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. 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 using the DMM. Does the DMM display the specified value? | B+ | Go to Step 6 | Go to Step 8 | ||||||
Momentarily connect the test lamp between the CKP sensor signal circuit and the CKP sensor 12-volt reference circuit. Does the fuel pump operate when ignition voltage was applied to the CKP sensor signal circuit? | -- | Go to Step 10 | Go to Step 9 | |||||||
7 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
8 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
9 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 10 | ||||||
10 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||
|
Important: The CKP system variation learn procedure must be performed anytime the relationship between the CKP sensor and the CKP reluctor wheel is changed. Refer to Crankshaft Position System Variation Learn .
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | |||||||
12 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||
Did you complete the repair? | -- | Go to Step 16 | -- | |||||||
14 |
Did you complete the repair? | -- | Go to Step 16 | Go to Step 15 | ||||||
15 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
16 |
Does the DTC run and pass? | -- | Go to Step 17 | Go to Step 2 | ||||||
17 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||
