Circuit Description
The crankshaft position (CKP) sensor is a 24X sensor. The CKP sensor provides 24 digital ON/OFF signals to the powertrain control module (PCM) per revolution of the crankshaft. This information is used by the PCM for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The PCM supplies 12 volts to the sensor on the 12-volt reference circuit and provides a ground on the low reference circuit. The CKP sensor provides signals to the PCM on the medium resolution engine speed signal circuit. The PCM monitors the CKP sensor for errors. If the PCM receives an inconsistent signal form the CKP sensor, DTC P0336 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0336 Crankshaft Position (CKP) Sensor Performance
Conditions for Running the DTC
| • | The engine is cranking or running. |
| • | This diagnostic runs continuously once the above conditions are met. |
Conditions for Setting the DTC
| • | The PCM detects that more or less than 48 CKP sensor pulses have occurred for every one camshaft position (CMP) sensor pulse. |
| • | This conditions exists for more than 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. |
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 | Observe the DTC Info with a scan tool. Is DTC P0335 also set? | -- | Go to DTC P0335 | Go to Step 3 | ||||||||||||
3 |
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Testing for Intermittent Conditions and Poor Connections | ||||||||||||
4 |
Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 5 | ||||||||||||
5 |
Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 6 | ||||||||||||
6 |
Is the voltage measured within 1 volt of the specified value? | B+ | Go to Step 7 | Go to Step 16 | ||||||||||||
7 |
Is the amperage more than the specified value? | 250 mA | Go to Step 8 | Go to Step 12 | ||||||||||||
8 | Test the 12-volt reference circuit for an intermittent condition or shorted to other circuits. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 9 | ||||||||||||
9 | Test the low reference circuit for an intermittent condition. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 10 | ||||||||||||
10 | Test the medium resolution engine speed signal circuit for an intermittent condition. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 11 | ||||||||||||
11 | 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 Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 14 | ||||||||||||
12 | Test the 12-volt reference circuit of the CKP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 13 | ||||||||||||
13 | Test the low reference circuit of the CKP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 | ||||||||||||
14 |
Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 15 | ||||||||||||
15 | Inspect the reluctor wheel for the following conditions:
Refer to Crankshaft and Bearing Cleaning and Inspection . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 17 | ||||||||||||
16 | Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 18 | ||||||||||||
17 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- | ||||||||||||
18 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 19 | -- | ||||||||||||
19 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 20 | ||||||||||||
20 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||||||||
