19.4 Analysis of DTC Module Block Diagram 19.4.1 Internal Registers of DTC The MRA, MRB, SAR, DAR, CRA, and CRB are all internal registers of the DTC that cannot be accessed directly by the CPU. The values set in these internal DTC registers are placed in the SRAM area as transfer information. When an activation … Read more
1. Identification Customer feedback: The vehicle’s dashboard light is illuminated, and HDS checks show a fault code, as shown in the image.2. Analysis2.1. Fault Description: When a fault is detected, the 12V charging system warning light and alarm are illuminated, and the DTC and freeze frame data are stored in the VCU memory. The VCU … Read more
Vehicle Information: Mileage 5497K, first maintenance completed on schedule. Fault Phenomenon: Multiple warning lights on the dashboard illuminate, reporting DTCs as shown in Table 1. The dealership cleared the DTCs and conducted related tests, but the fault did not reappear during the test drive. After several days of use by the owner, the fault reoccurred. … Read more
1. IdentificationThe customer’s vehicle cannot start, checking DTC fault P0339: Crankshaft sensor signal interruption fault. Replacing the CKP sensor and several other components did not resolve the issue.2. Analysis2.1. Fault DescriptionThe Crankshaft Position (CKP) sensor detects the fuel injection/ignition timing and engine speed for each cylinder. The CKP sensor consists of a rotor and a … Read more
I have always been curious about what the warning lights on a car dashboard mean, when they appear, and when they disappear. Over the past two years, I have gained some knowledge in this area, and I would like to share it with interested friends. This article will introduce the automotive controller (ECU) fault diagnosis … Read more