Refer to
CKP, CMP, ICM, Bank 1 KS and Bank 2 KS
Circuit Description
When the ignition control module (ICM) receives input pulses from the crankshaft position sensor, the ICM filters the camshaft position (CMP) sensor input to the PCM. The PCM uses these pulses in order to initiate the sequential fuel injection, and in order to determine the camshaft position for the misfire diagnostic. The PCM constantly monitors the number of camshaft position pulses. The PCM also compares the number of camshaft position sensor pulses to the number of 18X and 3X crankshaft position sensor pulses. If the PCM receives an incorrect number of pulses from the CMP sensor, DTC P0341 sets. The PCM will initiate the injector sequence without the camshaft position sensor input. Although the PCM will disable the misfire diagnostic, the engine will start, and the engine will run.
Conditions for Running the DTC
The engine is running, and the 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 6:1. |
| • | The ratio of 3X reference pulses to 18X reference pulses received by the PCM equals 6:1. |
| • | The conditions are present for more 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, by rubbed-through wire insulation, or by a broken wire inside the insulation. Inspect for the following conditions:
| • | A misrouted wiring harness--Ensure that the ICM harness is not routed near secondary ignition components. |
| • | A malfunctioning ignition coil--Remove the ignition coils and inspect the ignition control module and the coils for cracks, for carbon tracking, or for other signs that indicate that the coil secondary circuit is arcing to the ICM or to the ICM wiring harness. Refer to Ignition Coil Replacement . |
| • | Secondary ignition wires arcing to wiring harness--Inspect secondary ignition wires for carbon tracking or other signs of damage. |
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step ensures that the malfunction is present.
-
This step determines whether the malfunction is caused by a missing camshaft magnet or by a malfunctioning PCM. The voltage measured in this step should read approximately 4 volts, toggling to approximately 0 volts when the CMP sensor interfaces with the camshaft magnet.
-
When you replace the PCM, you must program the new PCM.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 |
Important: If the engine cranks but will not run, Refer to Engine Cranks but Does Not Run . Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||||||||
Does the DTC reset? | -- | Go to Diagnostic Aids | ||||||||
3 |
Is the voltage near the specified value? | 5 V | ||||||||
4 |
Is the voltage near the specified value? | 0 V | ||||||||
5 | Is the voltage on the camshaft position input signal circuit more than the specified value? | 5 V | ||||||||
6 |
Did you find and correct the condition? | -- | ||||||||
7 |
Did you find and correct the condition? | -- | ||||||||
8 |
Is the voltage near the specified value? | B+ | ||||||||
9 | Measure the voltage between the CMP sensor signal circuit and the sensor ground circuit at the camshaft position sensor harness connector. Is the voltage between the specified values? | 5 to 7 V | ||||||||
10 |
Does the voltage switch between 0 volts and 5 volts when you repeatedly tough the test lamp to the CMP sensor signal circuit? | -- | ||||||||
11 |
Did you find and correct the condition? | -- | ||||||||
12 |
Did you find and correct the condition? | -- | ||||||||
13 |
Did you find and correct the condition? | -- | ||||||||
14 |
Did you find and correct the condition? | -- | ||||||||
15 |
Did you find and correct the condition? | -- | ||||||||
16 |
Did you find and correct the condition? | -- | ||||||||
17 |
Did you find and correct the condition? | -- | ||||||||
18 | Replace the ignition control module. Refer to Ignition Control Module Replacement . Did you complete the replacement? | -- | -- | |||||||
19 | Replace the camshaft position sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | -- | |||||||
20 |
Did you find and correct the condition? | -- | ||||||||
Does the voltage toggle between the specified values? | 4 to 0 V | |||||||||
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the replacement? | -- | -- | ||||||||
23 | Replace the malfunctioning or missing camshaft position sensor magnet. Refer to Timing Chain and Sprockets Removal in Engine Mechanical. Did you complete the replacement? | -- | -- | |||||||
24 |
Does the DTC reset? | -- | System OK |
