• | 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. |
The crankshaft position (CKP) system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensor. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load.
The CKP system variation compensating values are stored in ECM memory after a learn procedure has been performed. If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, DTC P0300 may set.
• | The engine is running. |
• | The DTC runs continuously when the above condition is met. |
The ECM detects an incorrect CKP system variation values during deceleration or fuel cut-off.
DTC P1320 is a Type B DTC.
DTC P1320 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Important: The ECM continuously learns the CKP system variations. A CKP variation learn procedure cannot be performed with a scan tool.
• | A worn or damaged crankshaft or crankshaft bearings |
• | Debris between the CKP sensor and the reluctor wheel |
• | A damaged reluctor wheel |
• | Excessive crankshaft runout |
• | Any interference of the CKP sensor or CKP sensor signal to the control module |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming