Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor is connected directly to the ignition control module (ICM). The circuits between the CKP sensor and the IC module consist of the following circuits:
| • | The CKP sensor 1 signal circuit. |
| • | The low reference circuit. |
| • | If the PCM detects an incorrect number of CKP pulses, DTC P0336 sets. |
Conditions For Running The DTC
| • | DTC P0341 is not set. |
| • | The engine is running. |
Conditions for Setting the DTC
The CKP resync counter increments more than 15 times within 4 minutes and 15 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
| • | If the complaint was Engine Cranks But Will Not Run, you may set a DTC P0336 when attempting to start the engine more than 15 times and the ignition is not turned OFF between attempts. |
| • | The following conditions may cause this DTC to set: |
| - | The crankshaft reluctor wheel is either damaged or improperly installed. |
| - | There is an excessive air gap between the CKP sensor and the reluctor wheel. |
| - | There is 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 may 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.
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When a medium resolution resync occurs, an engine stumble should also occur. If the electrical connection of a component or an electrical wire is malfunctioning, an engine stumble or a medium resolution resync may be induced by wiggling the circuit or electrical connector.
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Operating malfunctioning non-engine related electronic components may emit electromagnetic interference (EMI), which may cause a resync. This step determines if the medium resolution resyncs are being caused by an outside source.
-
Thoroughly inspect any suspected circuitry. Refer to Diagnostic Aids.
-
An intermittent problem may be caused by a number of conditions. Refer to Diagnostic Aids.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | ||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls ? | -- | Go to Step 2 | |||||||
2 | Attempt to start the engine. Does the engine start and run? | -- | Go to Step 3 | |||||||
3 |
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Step 5 | ||||||
With the engine running, wiggle the electrical connectors of the following components and related circuits while listening for the engine to stumble:
Does the engine stumble? | -- | Go to Step 6 | Go to Step 7 | |||||||
Does the Med. Resolution Resync Counter on the scan tool increment while operating any non-engine related electronic components? | -- | Go to Step 9 | Go to Step 4 | |||||||
Did you complete the repair? | -- | Go to Step 15 | -- | |||||||
7 | Did the MIL illuminate in step 3? | -- | Go to Step 8 | Go to Step 15 | ||||||
Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 10 | |||||||
9 |
Did you complete the repair? | -- | Go to Step 15 | -- | ||||||
10 |
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 15 | ||||||
11 | Visually inspect the CKP reluctor wheel for damage or looseness. Refer to Diagnostic Aids in this DTC and Crankshaft and Bearing Cleaning and Inspection in Engine Mechanical. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
12 |
Did the MIL illuminate? | -- | Go to Step 13 | Go to Step 15 | ||||||
13 |
Did the MIL illuminate? | -- | Go to Step 14 | Go to Step 15 | ||||||
14 |
Did the MIL illuminate? | -- | Go to Diagnostic Aids | Go to Step 15 | ||||||
15 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 16 | ||||||
16 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||
