C1901

DTC C1901: TPMS Abnormality (Vehicle Speed Signal)

CIRCUIT OPERATION

The TPMS receiver receives the vehicle speed signal from the powertrain control module.

TPMS DTC SET CONDITION

DTC C1901 will be set if the TPMS receiver does not receive vehicle speed signal of 5 km/h (3 mph) or more during driving. At the same time this DTC is set, the TPMS warning light flashes for about 1 minute and then remain illuminated. TPMS receiver senses the vehicle's driving state by a driving G sensor inside the TPMS transmitter.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS DTC TO SET ARE:)

- Damaged wiring harness or connector
- Malfunction of the powertrain control module
- Malfunction of the TPMS receiver

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the MFI system diagnostic trouble code.

Check if an MFI system diagnostic trouble code is set.





(1)Turn the ignition switch to "ON" position.
(2)Read the diagnostic trouble code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the MFI system by referring to MFI Diagnosis - Diagnostic Trouble Code Chart Multiport Fuel Injection (MFI) [2.4L ENGINE] or MFI Diagnosis - Diagnostic Trouble Code Chart Multiport Fuel Injection (MFI) [3.8L ENGINE]. Then go to Step 4.

NO Go to Step 2.

STEP 2. Using scan tool MB991958, diagnose the CAN bus line.

Use scan tool MB991958 to diagnose the CAN bus lines.





(1)
CAUTION:
To prevent damage to scan tool (MB991958), always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool (MB991958).

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result satisfactory?

YES Go to Step 3.

NO Repair the CAN bus lines CAN Bus Diagnostics Chart). Then go to Step 3.

STEP 3. Using scan tool MB991958, recheck the TPMS diagnostic trouble code.

Check that the TPMS receiver sets a diagnostic trouble code.





(1)Turn the ignition switch to "ON" position.
(2)Recheck the diagnostic trouble code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC C1901 set?

YES Replace the TPMS receiver (Refer to TPMS Receiver Removal and Installation). Then go to Step 4.

NO The procedure is complete.

STEP 4. Recheck for diagnostic trouble code.

Check that the diagnostic trouble code is not reset.





(1)Turn the ignition switch to "ON" position.
(2)Check if the diagnostic trouble code is set.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the check result normally?

YES The procedure is complete.

NO Repeat the troubleshooting from Step 1.