Circuit Description
The intake camshaft position (CMP) sensor produces a 1X signal for each revolution of the intake camshaft. This signal is used for startability. If the PCM does not receive a crankshaft position (CKP) sensor signal, the engine should still start based off of the information from the CMP. The CMP is connected directly to the powertrain control module (PCM) and consists of the following circuits:
| • | A 12-volt reference circuit |
| • | A low reference circuit |
| • | A CMP sensor signal circuit |
If the PCM does not receive a CMP sensor pulse, DTC P0340 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0340 Intake CMP Sensor Circuit
Conditions for Running the DTC
| • | The engine is running. |
| • | DTC P0340 runs continuously when the engine is running. |
Conditions for Setting the DTC
The PCM does not receive one CAM pulse within 3 seconds.
Action Taken When the DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active. |
| • | The PCM records the operating conditions at the time when the diagnostic fails. This information stores in the Freeze Frame and Failure Records buffers. |
| • | A history DTC stores. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF after three 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. |
| • | Clear the DTCs with a scan tool. |
Diagnostic Aids
| • | The following conditions may cause this DTC to set: |
| - | Damage to the camshaft reluctor wheel |
| - | Damage to the CMP sensor |
| - | 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 | Values | 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 | |||||||
2 | Attempt to start the engine. Does the engine start and run? | -- | Go to Step 3 | Go to Step 7 | ||||||
3 |
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids | ||||||
4 |
Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 7 | ||||||
5 |
Is the voltage more than the specified value? | 0.2 V | Go to Step 8 | Go to Step 6 | ||||||
Is the duty cycle within the specified range? | 48-52% | Go to Step 9 | Go to Step 10 | |||||||
7 | Test the 12-volt reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||||
8 | Test the low reference circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||||
9 | Test the signal circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||||
10 | 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 . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
11 | 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 15 | Go to Step 14 | ||||||
12 |
Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 | ||||||
13 | Replace the intake CMP sensor. Refer to Camshaft Position Sensor Replacement - Intake . Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||
14 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | 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 | |||||||
