DDEC III/IV Single ECM Troubleshooting – Section 42.1 Description of Flash Code 42

Section 42.1
Description of Flash Code 42

Flash Code 42 indicates that the ECM has detected missing Synchronous Reference Sensor (SRS) pulses, or the ECM has detected extra Timing Reference Sensor (TRS) pulses, see Figure "Synchronous Reference Sensor and Timing Reference Sensor " .‪

Figure 1. Synchronous Reference Sensor and Timing Reference Sensor