DTC Detection Logic
WARNING: This page is about a different car, the 2013 Infiniti M56 and 2013 Infiniti M37. However, it is still accessible from the selected car via links, so may be relevant.
| DTC |
Display Item |
Malfunction detected condition |
Possible cause |
| C1921 |
ENG REV SIGNAL |
Malfunction is detected in engine speed signal that is output from ECM via CAN communication. (Improper signal is input engine speed.) |
Engine speed signal error |