Circuit Description
The camshaft position (CMP) sensor produces a 6X plus a sync signal for each revolution of the exhaust camshaft. These signals are for control of sequential fuel injection and for exhaust camshaft phaser control. The CMP is connected directly to the powertrain control module (PCM) and consists of the following circuits:
| • | 12-volt reference |
| • | Low reference |
| • | CMP sensor signal |
If the PCM receives a minimum number of CMP resyncs within a calculated amount of time, diagnostic trouble code (DTC) P0341 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0341 Camshaft Position (CMP) Sensor Performance
Conditions for Running the DTC
| • | The engine is running. |
| • | DTC P0341 runs continuously when the above conditions are met. |
Conditions for Setting the DTC
The PCM sees more than 15 CMP sensor resyncs in 256 seconds (4 minutes 16 seconds).
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate after 2 consecutive ignition cycles in which the diagnostic runs with the malfunction present. |
| • | The PCM will record the operating conditions at the time that the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information. |
| • | A history DTC stores. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault. |
| • | A history DTC will clear after 40 consecutive warm up cycles without a fault. |
| • | A scan tool can clear the DTCs. |
Diagnostic Aids
| • | If the PCM sees less than 15 resyncs in 256 seconds, the counter is reset to 0. When a faulty electrical connection is present, the CMP Reference Activity counter will stop incrementing and the CMP Resync Counter will increment. |
| The following conditions may cause this DTC to set: |
| - | Incorrect harness routing near secondary ignition components |
| - | Ignition coil arcing to wiring harnesses or IC module |
| - | Camshaft reluctor wheel damage |
| - | The sensor coming in contact with the reluctor wheel |
| - | Foreign material passing between the sensor and the reluctor wheel |
| • | If the condition is intermittent, refer to Intermittent Conditions . |
Test Description
The number below refers to the step number on the diagnostic table.
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 - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||
2 | Turn ON the ignition, with the engine OFF. Are any other DTCs set? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 | ||||||
3 |
Is the CMP Resync Counter incrementing? | -- | Go to Step 4 | Go to Diagnostic Aids | ||||||
Did the CMP Resync Counter stop incrementing? | -- | Go to Step 5 | Go to Step 6 | |||||||
5 |
Does the DMM display a Hertz reading above the specified value? | 0 Hz | Go to Step 6 | Go to Step 7 | ||||||
6 | Visually and physically inspect all circuits going to the CMP sensor for the following:
If you find incorrect routing, correct the harness routing. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | ||||||
7 | Test for an intermittent and for a poor connection at the CMP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | ||||||
8 | Replace the CMP sensor. Refer to Camshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||
9 |
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||
10 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||
11 |
Did the DTC fail this ignition? | -- | Go to Step 12 | Go to Step 2 | ||||||
12 | 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 | ||||||
