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C2191








TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2191/91: Vehicle Speed Signal Error (Test Mode DTC)

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

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- When replacing the tire pressure warning ECU and receiver, read the IDs stored in the ECU using the intelligent tester and write them down before removal.
- It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU or a valve and transmitter has been replaced.

PROCEDURE

1. CHECK DTC
(a) Check for DTCs of the MPX communication and the speed sensor Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
C -- Continue to next step.
2. READ VALUE ON INTELLIGENT TESTER
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position, and turn the intelligent tester on.
(c) Select the item below in the Data List and read the value displayed on the intelligent tester.
HINT: Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST

METER





(d) Check that the values indicated on the tester and on the combination meter are the same.
OK:
Vehicle speed indicated on the intelligent tester indicates the actual speed.
OK -- REPLACE TIRE PRESSURE WARNING ECU
NG -- REPLACE COMBINATION METER