DTC C2191/91: Vehicle Speed Signal Error (Test Mode DTC): Description

The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering signal check mode (test mode), and cleared when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in signal check mode.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
C2191/91	Test mode procedure is performed	Combination meter Vehicle speed sensor Wire harness or connector Tire pressure warning ECU