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 CMP Active Counter stops incrementing diagnostic trouble code (DTC) P0340 will set.
This diagnostic procedure supports the following DTC:
DTC P0340 Camshaft Position (CMP) Sensor Circuit
• | The engine is running. |
• | DTC P0340 runs continuously when the above conditions are met. |
The CMP Active Counter is not incrementing for more than 3.8 seconds.
• | 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. |
• | 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. |
• | Use a scan tool to clear the DTCs. |
• | Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter resets to 0. When a poor connection is present, the cam sensor active counter stops incrementing and the cam sensor resync counter starts to increment. |
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 . |
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 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||
2 |
Does the scan tool parameter increment? | -- | Go to Step 3 | Go to Step 4 | ||||
3 |
Did the DTC fail this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids | ||||
4 |
Is the voltage more than the specified value? | 10 V | 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? | 40-50% | Go to Step 9 | Go to Step 10 | |||||
7 | Test the 12-volt reference circuit for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||
8 | Test the low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||
9 | Test the signal circuit for an open, short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 CMP sensor. Refer to Camshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- | ||||
14 | 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 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? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |