Circuit Description
The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor is connected directly to the powertrain control (PCM) module. The circuits between the CKP sensor and the PCM consist of the following circuits:
| • | The CKP sensor 1 signal circuit |
| • | The low reference circuit |
Conditions For Running The DTC
| • | DTC P0341 is not set. |
| • | The engine is running. |
Conditions for Setting the DTC
The CKP resync counter goes 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 DTC P0336 when attempting to start the engine more than 15 times and the ignition is not turned OFF between attempts. |
| • | An intermittent problem may be caused by the following conditions: |
| - | Rubbed-through wire insulation |
| - | Poor electrical connections |
| - | Broken wire inside the insulation |
| • | Thoroughly inspect any suspected circuitry for the following conditions: |
| - | Backed-out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed terminals |
| - | Damaged terminals |
| - | Poor terminal-to-wire connections |
| - | Physical damage to the wiring harness |
| • | An intermittent can also be the result of a defective reluctor wheel. Remove the crankshaft sensor and inspect the reluctor wheel through the hole. Refer to Crankshaft Position Sensor Replacement . |
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.
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Thoroughly inspect any suspected circuitry. Refer to Diagnostic Aids.
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An intermittent problem may be caused by a number of conditions. Refer to Diagnostic Aids.
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Program the replacement powertrain control module (PCM), and perform the CKP system variation learn procedure.
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 | Attempt to start the engine. Will the engine start? | -- | Go to Step 3 | |||||
3 |
Does the DTC fail this ignition? | -- | Go to Step 4 | Go to Step 5 | ||||
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Caution: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury. 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 12 | -- | |||||
7 | Did the MIL illuminate in step 3? | -- | Go to Step 8 | Go to Step 12 | ||||
Did you complete the repair? | -- | Go to Step 12 | Go to Step 10 | |||||
9 |
Did you complete the repair? | -- | Go to Step 12 | -- | ||||
10 |
Did the MIL illuminate? | 5 Minutes | Go to Step 11 | Go to Step 12 | ||||
Did the MIL illuminate? | 5 Minutes | Go to Diagnostic Aids | Go to Step 12 | |||||
12 |
Does the DTC run and pass? | -- | Go to Step 13 | Go to Step 2 | ||||
13 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||
