DTC C1901: Vehicle speed signal: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.

Q: Is the check result normal?
- YES: Go to Step 2.
- NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS CHART .). On completion, go to Step 2.
STEP 2. DTC recheck after resetting CAN bus lines
Recheck if DTC C1901 is stored.
1. Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
2. Check if the DTC is stored.
3. Turn the ignition switch (engine starting switch) to the "LOCK" (OFF) position.
Q: Is the DTC stored?
- YES: Go to Step 3.
- NO: The procedure is complete.
STEP 3. Using scan tool other system DTC
Check if the DTC is stored in the ASC-ECU.

Q: Is the DTC stored?
- YES: Carry out the troubleshooting for ASC-ECU (Refer to TROUBLESHOOTING .). Then go to Step 5.
- NO: Go to Step 4.
STEP 4. Check the TPMS transmitter acceleration.
Check the acceleration value sent by each TPMS transmitter by performing the transmitter check using the scan tool (Refer to DATA LIST REFERENCE TABLE ) when the vehicle is stationary.
- Item 31: Acceleration tire1
- Item 32: Acceleration tire2
- Item 33: Acceleration tire3
- Item 34: Acceleration tire4
  OK: Acceleration value: 5G or less
Q: Is the check result normal?
- YES: Replace the ETACS-ECU < Vehicles without Keyless Operation System > (Refer to ETACS-ECU .) or KOS-ECU < Vehicles with Keyless Operation System > (Refer to KOS-ECU .), and register ID codes (Refer to TIRE PRESSURE SENSOR ID REGISTRATION .). Then go to Step 5.
- NO: Replace the TPMS transmitter (Refer to TPMS TRANSMITTER .), and register ID codes (Refer to TIRE PRESSURE SENSOR ID REGISTRATION .). Then go to Step 5.
STEP 5. Check whether the DTC is stored again.
Recheck if the DTC is stored.
1. Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
2. Check if the DTC is stored.
3. Turn the ignition switch (engine starting switch) to the "LOCK" (OFF) position.
Q: Is DTC C1901 stored?
- YES: Start over at Step 1.
- NO: The procedure is complete.