DTC P0341 Camshaft Position (CMP) Sensor Performance. Chevrolet Monte Carlo 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 DTC P0341 Camshaft Position (CMP) Sensor Performance

Refer to

Cell 21: Ignition System, Knock Sensors

Engine Controls Components
Powertrain Control Module Description
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
OBD II Symbol Description Notice
Cell 21: Power, Ground, MIL, and DLC
Cell 21: Fuel Controls
Cell 10: Fuses 12, 21, 30, 33, 39, and 42

Circuit Description

The camshaft position PCM input is produced by the ignition control module. The ICM produces the camshaft position PCM input by filtering the Camshaft Position (CMP) sensor pulses when the engine is running and CKP sync pulses are also being received. The PCM uses the camshaft position PCM input pulses to initiate sequential fuel injection and to determine crankshaft position for the misfire diagnostic. The PCM constantly monitors the number of pulses on the camshaft position PCM input circuit and compares the number of camshaft position PCM input pulses to the number of 18X reference pulses and the number of 3X reference pulses being received. If the PCM receives an incorrect number of pulses on the camshaft position PCM input circuit, DTC P0341 will set and the PCM will initiate injector sequence without the camshaft position PCM input with a one in six chance that injector sequence is correct. The engine will continue to start and run normally, although the misfire diagnostic will be disabled.

Conditions for Running the DTC

The engine is running (3X reference pulses are being received).

Conditions for Setting the DTC

•	The ratio of 3X reference pulses to Cam pulses received by the PCM does not equal 6.

•	The ratio of 3X reference pulses to 18X reference pulses received by the PCM equals 6.

•	The conditions are present for greater than 10 seconds.

Action Taken When the DTC Sets

•	The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.

•	The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.

Conditions for Clearing the MIL/DTC

•	The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.

•	The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using a scan tool.

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for the following conditions:

•	Poor connection.

Inspect the PCM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

•	Damaged harness.

Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition on and observe a voltmeter connected to the 18X reference circuit at the PCM harness connector while moving connectors and wiring harnesses related to the ICM. A change in voltage will indicate the location of the malfunction.

•	Misrouted wiring harness.

Inspect the ICM harness to ensure that it is not routed near secondary ignition components.

•	Malfunctioning Ignition Coil.

Remove the ignition coils and inspect the ignition control module and coils for cracks, carbon tracking, or other signs that indicate that the coil secondary circuit is arcing to the ICM or ICM wiring harness.

•	Secondary ignition wire(s) arcing to wiring harness.

Check secondary ignition wires for carbon tracking or other signs of damage.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

Ensures that the fault is present.

Determines whether the fault is being caused by a missing camshaft magnet or a faulty PCM. The voltage measured in this step should read around 4 volts, toggling to near 0 volts when the CMP sensor interfaces with the camshaft magnet.

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

DTC P0341 - CMP Sensor Circuit Performance

Step

Action

Value(s)

Yes

Important:: If the engine cranks but will not run, refer to Engine Cranks but Does Not Run .

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to the Powertrain On Board Diagnostic (OBD) System Check

Turn ON the ignition, review and record scan tool Fail Records data.
Operate vehicle within Fail Records conditions as noted.
With a scan tool, monitor Specific DTC info for DTC P0341 until the DTC P0341 test runs

Does the scan tool indicate DTC P0341 failed this ignition?

Go to Step 3

Go to Diagnostic Aids

Turn OFF the ignition.
Disconnect the PCM.
Monitor the voltage on the camshaft position input signal circuit at the PCM connector using a J 39200 Digital Multimeter that is connected to a good ground.
Turn ON the ignition.
Observe the voltage displayed on the DMM.

Important: If DMM indicates 0 volts, bump over engine to insure cam sensor magnet is not located under the cam sensor at the time of this test.

Is the voltage near the specified value?

Go to Step 4

Go to Step 5

Turn OFF the ignition.
Without disconnecting the CMP harness connector, remove the CMP sensor from the engine front cover.

Important: The magnet used must have sufficient power and the correct polarity. If the voltage remains at 5 volts, retest using the opposite end of the magnet.

Turn ON the ignition.
Place a magnet on the CMP sensor.

Does the voltage toggle from 5 volts to 0 volts as the magnet is placed on the sensor?

Go to Step 16

Go to Step 8

Does the voltage on the camshaft position input signal circuit measure greater than the specified value?

Go to Step 7

Go to Step 6

Turn OFF the ignition.
Disconnect the ignition control module (leave the PCM disconnected).
Turn ON the ignition.
Probe the camshaft position input signal circuit and the CMP sensor signal circuit at the ignition control module connector with a J 35616-200 Unpowered Test Lamp that is connected to B+.
If the test lamp is ON, locate and repair short to ground in the camshaft position input signal circuit or the CMP sensor signal circuit as necessary. Refer to Wiring Repairs .

Did you find and correct the condition?

Go to Step 24

Go to Step 13

Turn OFF the ignition.
Disconnect the ignition control module (leave the PCM disconnected).
Turn ON the ignition.
Probe the camshaft position input signal circuit with a test lamp that is connected to a good ground.
If the test lamp is on, locate and repair short to voltage in the camshaft position input signal circuit. Refer to Wiring Repairs ,

Did you find and correct the condition?

Go to Step 24

Go to Step 18

Disconnect the CMP sensor.
Measure the voltage on the sensor feed circuit using a DMM that is connected to the sensor ground circuit at the CMP sensor harness connector.

Is the voltage at the specified value?

B+

Go to Step 9

Go to Step 12

Measure the voltage on the CMP sensor signal circuit using a DMM that is connected to the sensor ground circuit at the camshaft position sensor harness connector.

Is the voltage within the specified value?

5-7V

Go to Step 10

Go to Step 11

Monitor the voltage on the camshaft position input signal circuit at the PCM harness connector using a DMM that is connected to a good ground.
Monitor the voltage display on the DMM while repeatedly touching the CMP sensor signal circuit at the CMP sensor connector with a test lamp that is connected to a good ground.

Does the DMM voltage display switch between 0 and 5 volts when the test lamp is repeatedly touched to the CMP sensor signal circuit?

Go to Step 15

Go to Step 14

Turn OFF the ignition.
Disconnect the ignition control module (leave the CMP sensor disconnected).
Turn ON the ignition
Check for the following conditions:

•	The CMP sensor signal circuit for an open, a short to voltage or a short to ground.

•	The camshaft position input signal circuit for a short to voltage.

If a problem is found, repair it as necessary. Refer to Wiring Repairs .

Did you find and correct the condition?

Go to Step 24

Go to Step 14

Turn OFF the ignition.
Disconnect the ignition control module and the CMP sensor.
Check the following circuits for an open between the ignition control module and the CMP sensor:

•	The sensor feed circuit.

•	The sensor ground circuit.

If a problem is found, repair as necessary. Refer to Wiring Repairs .

Did you find and correct the condition?

Go to Step 24

Go to Step 14

Check for an open in the camshaft position input signal circuit between the PCM and the ignition control module.
If a problem is found, repair as necessary. Refer to Wiring Repairs .

Did you find and correct the condition?

Go to Step 24

Go to Step 14

Check for poor connections at the ignition control module.
If a problem is found, repair as necessary. Refer to Intermittents and Poor Connections Diagnosis .

Did you find and correct the condition?

Go to Step 24

Go to Step 17

Check for poor connections at the camshaft position sensor.
If a problem is found, repair it as necessary. Refer to Intermittents and Poor Connections Diagnosis .

Did you find and correct the condition?

Go to Step 24

Go to Step 19

Check for poor connections at the PCM.
If a problem is found, repair it as necessary. Refer to Intermittents and Poor Connections Diagnosis .

Did you find and correct the condition?

Go to Step 24

Go to Step 20

Check for the following conditions:

•	Incorrect harness routing near secondary ignition components.

•	Ignition coil arcing to the wiring harness or to the ignition control module. Check ignition coils for cracks, carbon tracking, or other signs of damage. Refer to Ignition Coil Replacement .

•	Secondary ignition wire(s) arcing to the wiring harness.

If a problem is found, repair as necessary.

Did you find and correct the condition?

Go to Step 24

Go to Step 18

Replace the ignition control module. Refer to Ignition Control Module Replacement .

Is the action complete?

Go to Step 24

Replace the camshaft position sensor. Refer to Camshaft Position Sensor Replacement .

Is the action complete?

Go to Step 24

Check for the following conditions:

•	Incorrect harness routing near secondary ignition components.

•	Ignition coil arcing to wiring harness or ignition control module. Check ignition coils for cracks, carbon tracking, or other signs of damage. Refer to Ignition Coil Replacement .

•	Secondary ignition wire(s) arcing to wiring harness.

If a problem is found, repair as necessary.

Did you find and correct the condition?

Go to Step 24

Go to Step 21

Reinstall the CMP sensor to the engine front cover.
Observe the Digital Multimeter connected to monitor voltage on the camshaft position input signal circuit while repeatedly bumping the engine with the starter.

Does the voltage toggle between the specified values?

5V / 0V

Go to Step 22

Go to Step 23

Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .

Replace the PCM.

Is the action complete?

Go to Step 24

Replace faulty or missing camshaft position sensor magnet.

Is the action complete?

Go to Step 24

Review and record scan tool Fail Records data.
Clear DTCs.
Operate the vehicle within Fail Records conditions as noted.
With a scan tool, monitor Specific DTC info for DTC P0341 until the DTC P0341 test runs

Does the scan tool indicate DTC P0341 failed this ignition?

Go to Step 2

System OK