The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor produces a DC voltage of varying amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the DC output voltage depends on crankshaft position and battery voltage. The CKP sensor works in conjunction with a 58-tooth reluctor wheel attached to the crankshaft. The engine control module (ECM) determines the crankshaft position by the reference gap. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the camshaft position (CMP) sensor inputs. The CKP sensor is also used to detect a misfire. The CKP sensor circuits connect directly to the ECM. The circuits between the CKP sensor and ECM consists of the following:
• | A 12-volt reference |
• | A low reference |
• | A CKP sensor signal |
If the ECM detects an incorrect number of CKP sensor signals, DTC P0336 sets.
This diagnostic procedure supports the following DTC:
DTC P0336 Crankshaft Position (CKP) Sensor Performance
• | DTCs P0340, P0341, P0345, and P0346 are not set. |
• | The engine is cranking or running. |
• | DTC P0336 runs continuously once the above conditions are met. |
The ECM detects an incorrect number of signals from the CKP sensor for more than 1 second.
• | 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. |
• | 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 | Yes | No | ||||||||||||
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Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module 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 | ||||||||||||
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 cycle? | Go to Step 4 | Go to Intermittent Conditions | ||||||||||||
4 |
Did you find and correct the condition? | Go to Step 17 | Go to Step 5 | ||||||||||||
5 | Test the low reference circuit for an intermittent condition between the ECM and the 12-way connector. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 6 | ||||||||||||
6 | Test the crankshaft position (CKP) sensor signal circuit for an intermittent condition between the ECM and the 12-way connector. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 7 | ||||||||||||
7 | Test for an intermittent and for a poor connection at the ECM side of the 12-way connector. 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 17 | 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 Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 9 | ||||||||||||
9 |
Did you find and correct the condition? | Go to Step 17 | Go to Step 10 | ||||||||||||
10 | Test the low reference circuit for an intermittent condition between the CKP sensor and the 12-way connector. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 11 | ||||||||||||
11 | Test the CKP sensor signal circuit for an intermittent condition between the CKP sensor and the 12-way connector. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 17 | Go to Step 12 | ||||||||||||
12 | Test for an intermittent and for a poor connection at the CKP sensor side of the 12-way connector. 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 17 | Go to Step 13 | ||||||||||||
13 | Test for an intermittent and for a poor connection 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 17 | Go to Step 14 | ||||||||||||
14 |
Did you find and correct the condition? | Go to Step 17 | Go to Step 15 | ||||||||||||
15 | Visually inspect the crankshaft reluctor wheel for following conditions:
Refer to Crankshaft and Bearing Cleaning and Inspection in Engine Mechanical. Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | ||||||||||||
16 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | Go to Step 17 | -- | ||||||||||||
17 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 18 | ||||||||||||
18 | 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 |