Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0008: Engine Position System Performance Bank 1DTC P0009: Engine Position System Performance Bank 2
Circuit/System Description
The engine control module (ECM) tests for a misalignment between both camshafts on one bank of the engine and the crankshaft. The misalignment would be at an idler sprocket for either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of the engine, the ECM compares the learned values to a reference value. The ECM will set a DTC if both learned values for one bank of the engine are exceeding a calibrated threshold in the same direction.
Conditions for Running the DTC
| • | DTC P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094, or P2095 is not set. |
| • | The engine is operating for greater than 50 seconds. |
| • | The engine coolant temperature is between 0-95°C (32-203°F). |
| • | The calculated engine oil temperature is colder than 120°C (248°F). |
| • | The engine must accelerate such that the CMP actuator system is commanded from the park position to the phased position. This is considered a cam control cycle. There must be a minimum of 2 cam control cycles for at least 2.5 seconds each, in the phased position. |
| • | DTCs P0008 and P0009 run continuously when the above conditions are met. |
Conditions for Setting the DTC
The ECM detects that both camshafts on either bank of the engine are mis-aligned with the crankshaft, greater than 6 degrees, for greater than 4 seconds or a cumulative of 30 seconds.
Action Taken When the DTC Sets
DTCs P0008 and P0009 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0008 and P0009 are Type B DTCs.
Diagnostic Aids
| • | Inspect the engine for any recent engine mechanical repairs. An incorrectly installed secondary timing chain can cause this DTC to set. |
| • | A single failed camshaft actuator or actuator solenoid will not cause this DTC to set. This diagnostic algorithm is designed to detect an alignment condition between a primary intermediate sprocket and the secondary timing chain, or the alignment between a primary intermediate sprocket and the crankshaft. Either condition would cause the camshaft timing for both cams on one bank to be off an equal number of degrees. |
| • | The presence of DTCs P0008 and P0009 along with DTCs P0016, P0017, P0018, and P0019 indicates a possible condition with the primary timing chain and the alignment between both intermediate sprockets and the crankshaft. Or, the crankshaft reluctor wheel has moved and is no longer referenced to top dead center (TDC). |
| • | Observe the scan tool CMP Desired, Actual, and Angle Variance parameters before a DTC sets. This may help to isolate whether a condition is specific to one camshaft, one bank, or caused by a condition with the primary crankshaft timing. |
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Clear the DTCs with a scan tool.
- Allow the engine to reach the normal operating temperature.
- Idle the engine for 10 minutes or until a DTC sets. Observe the DTC information with a scan tool, DTCs P0008 and P0009 should not set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Inspect the timing chains and tensioners for excessive wear or misalignment.
- Inspect the crankshaft reluctor wheel for being mispositioned on the crankshaft.
| ⇒ | If you find a condition with the timing chains or tensioners, repair as necessary. |
| ⇒ | If you find a condition with the crankshaft, repair as necessary. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
