P0341-CAMSHAFT POSITION SENSOR PERFORMANCE
For a complete wiring diagram Refer to Section 8W
Theory of Operation
The Camshaft Position (CMP) Sensor is a hall effect type sensor. The sensor produces a 5–volt digital signal (square wave). The ECM provides a 5–volt supply, 5–volt sensor
signal and ground to the CMP Sensor. The sensor is positioned opposite a toothed eccentric on the camshaft. As the camshaft rotates, the teeth on the eccentric pass closely to the CMP sensor triggering
the hall-effect switch causing the digital switching of the sensor signal from high (5–volts) to low (0 volts).
Possible Causes
|
(K844) CMP 5-VOLT SUPPLY CIRCUIT OPEN
|
(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
|
CHECKING (K844) CMP 5-VOLT SUPPLY CIRCUIT
|
DAMAGED CMP SENSOR OR CAMSHAFT
|
ECM
|
(K944) CMP SENSOR GROUND CIRCUIT OPEN
|
INTERMITTENT CONDITION
|
(K44) CMP SENSOR SIGNAL CIRCUIT OPEN
|
(K844) CMP 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
|
(K44) CMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
|
CAMSHAFT POSITION SENSOR
|
(K844) CMP 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT
|
(K44) CMP SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT
|
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
VERIFY ACTIVE DTC
NOTE:
If any Sensor Reference or Sensor Supply voltage DTCs are present, perform the applicable diagnostic procedure before continuing with this test.
NOTE:
The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the Service Information to ensure the timing belt is properly
installed.
NOTE:
If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed
on the scan tool at the same time the DTC is displayed.
NOTE:
Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase the ECM DTCs.
Attempt to start the engine cranking the engine for at least 7 seconds.
With the scan tool, read the ECM DTCs.
Does the scan tool display this DTC?
Yes
No
2.
TEST DRIVE
Turn the ignition on.
With the scan tool, erase the ECM DTCs.
Test drive the vehicle.
With the scan tool, read the ECM DTCs.
Does the scan tool display this DTC?
Yes
No
3.
CHECKING (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Camshaft Position Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector.
Select the appropriate voltage reading.
Voltage is above 5.4 volts.
Voltage is between 4.7 and 5.4 volts.
Voltage is below 4.7 volts.
4.
(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the (K44) CMP Position Sensor Signal circuit at the CMP Sensor harness connector.
Is the voltage below 1.0 volt?
Yes
No
5.
CHECKING (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT
Measure the voltage of the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector.
Select the appropriate voltage reading.
Voltage is above 5.4 volts.
Voltage is between 4.7 and 5.4 volts.
Voltage is below 4.7 volts.
6.
(K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Connect one end of a jumper wire to the ECT Sensor signal circuit in the ECT Sensor harness connector.
Connect the other end of the jumper wire to the (K944) CMP Sensor Ground circuit in the Camshaft Position Sensor harness connector.
Turn the ignition on.
With the scan tool in Engine, Sensors, read the Engine Coolant Temp volts.
Is the voltage below 0.5 volt?
Yes
No
7.
(K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the (K944) CMP Sensor Ground circuit between the CMP Sensor harness connector and the ECM harness connector.
Is the resistance below 10.0 ohms?
Yes
No
8.
DAMAGED CAMSHAFT POSITION SENSOR OR CAMSHAFT
Turn the ignition off.
Remove the CMP Sensor.
Inspect the CMP Sensor for conditions such as loose mounting screws, damage, or cracks.
Inspect the camshaft for conditions such as damage, debris or cracked teeth.
Is there any evidence of these conditions?
Yes
No
9.
(K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the (K844) CMP 5-Volt Supply circuit between the ECM harness connector and the CMP Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
No
10.
(K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
No
11.
(K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT
Measure the resistance between the (K844) CMP Sensor 5-Volt Supply circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
No
12.
(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the (K44) CMP Sensor Signal circuit between the ECM harness connector and the CMP Sensor harness connector.
Is the resistance below 10.0 ohms?
Yes
No
13.
(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
No
14.
(K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT
Measure the resistance between the (K44) CMP Sensor Signal circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector.
Is the resistance above 1000 ohms?
Yes
No