C1240

DTC C1240 SECOND SPEED INPUT FAULT

GENERAL DESCRIPTION
The TPMS has a automatic sensor learn function.

This function is to register sensor ID automatically during driving. (Typical time at driving continuously over 12.4 mph (20kph)) to learn a new sensor is up to 20 minutes.

Therefore a speed input signal is used for this function.

DTC DESCRIPTION
This DTC indicates that the speed input 2 is open or short circuited.

DTC DETECTING CONDITION





TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
3. Has a problem been found?

YES
> Repair if necessary and then go to "Verification of Vehicle Repair" procedure.

No
> Go to "Signal Circuit Inspection" procedure.

SIGNAL CIRCUIT INSPECTION
1. Ignition "OFF" & Engine "OFF".
2. Disconnect TPMS connector and vehicle speed sensor connector.
3. Measure resistance between "13" terminal of the TPMS harness connector and "X terminal of the vehicle speed sensor harness connector.





4. Is the measured resistance within specifications?

YES
> Check for short circuit between TPMS harness connector and vehicle speed sensor harness connector.
> If harness condition is OK, replace vehicle speed sensor and then go to "Verification of Vehicle Repair" procedure.

No
> Check for open circuit between TPMS harness connector and vehicle speed sensor harness connector.
> Repair if necessary and then go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect TPMS exciter or scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Using a TPMS exciter or scan tool, Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present?

YES
> Go to the applicable troubleshooting procedure.

No
> System performing to specification at this time.