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HOMESERVICE MANUALSSUBARU2014IMPREZA SPORT LIMITEDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESVEHICLE DYNAMICS CONTROL (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC C1811: SYSTEM FAILURETROUBLE SYMPTOM
2014 Subaru Impreza Sport Limited

DTC C1811: System Failure: Trouble Symptom

2014 Subaru Impreza Sport LimitedSECTION Trouble Symptom
  • ABS does not operate.
  • VDC does not operate.
  • EBD may not operate.
  • Hill start assist does not operate.
DTC PROCEDURE

Step Check Yes No
1 CHECK INSTALLATION OF VDCCM&H/U  . Is VDCCM&H/U installed properly without being tilted?
Is the bracket deformation-free?
Are the VDCCM&H/U installation bolts installed without missing or getting loose?		 Go to step 2  . Repair the defective part. Go to step 2  .
2 CHECK STEERING WHEEL  .
  1. Drive the vehicle on a flat road.
  2. Park the vehicle straight.
  3. Check the steering wheel for deviation from center.
 Is the deviation from the center of steering wheel less than 5°? Go to step 3  . Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. Go to step 3  . < Ref. to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).>
3 CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR  .
  1. Adjust steering wheel to the center position.
  2. Connect Subaru Select Monitor, and select "Current Data Display & Save".
  3. Read the «Steer Angle Sensor Op» displayed on display.
 Is the indicated reading of the «Steer Angle Sensor Op» on the monitor display -10° - 10°? Go to step 4  . Check the installation of the steering wheel and steering angle sensor, and replace the parts if necessary.
4 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR  .
  1. Drive the vehicle on a flat road.
  2. Park the vehicle straight.
  3. Connect Subaru Select Monitor, and select "Current Data Display & Save".
  4. Read output of sensors displayed on display.
 Are the indicated reading of sensor outputs following values?
Lateral G sensor Output: -2 - 2 m/s2
Fr Rr G sensor Output: -2 - 2 m/s2
Yaw Rate Sensor Output: -4 - 4 deg/s		 Go to step 5  . Recheck from step 1, and if the problem is not solved, go to next. Go to step 8  .
5 SET 0 POINT FOR LONGITUDINAL G SENSOR USING SUBARU SELECT MONITOR  .
  1. Select "Work Support" on Subaru Select Monitor.
  2. Perform the VDC sensor midpoint setting mode. < Ref. to VDC SENSOR MIDPOINT SETTING MODE , ADJUSTMENT, VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).>
 Is the 0 point setting successful? Go to step 6  . Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM and the steering angle sensor. < Ref. to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).> < Ref. to STEERING ANGLE SENSOR .>
6 PERFORM DRIVING TEST  .
Drive approximately 10 minutes, and check if the warning lights illuminate or improperly operate during driving.		 Did the ABS warning light or VDC warning light remain off?
Does ABS or VDC operate without malfunction?		 Go to step 7  . Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM only. < Ref. to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).>
7 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR  .
  1. Park the vehicle on a level surface.
  2. Connect Subaru Select Monitor, and select "Current Data Display & Save".
  3. Read output of sensors displayed on display.
 Are the indicated reading of sensor outputs following values?
Lateral G sensor Output: -2 - 2 m/s2
Fr Rr G sensor Output: -2 - 2 m/s2
Yaw Rate Sensor Output: -4 - 4 deg/s		 It results from a temporary noise interference. Replace the VDCCM only. < Ref. to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).>
8 CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR  .
  1. Remove the VDCCM&H/U installation bolt and bracket.
  2. Keep VDCCM&H/U in a horizontal position.
  3. Connect Subaru Select Monitor, and select "Current Data Display & Save".
  4. Read output of sensors displayed on display.
 When VDCCM&H/U is in a horizontal position, are the indicated reading of sensor outputs following values?
Lateral G sensor Output: -1.5 - 1.5 m/s2
Fr Rr G sensor Output: -1.5 - 1.5 m/s2
Yaw Rate Sensor Output: -4 -4 deg/s		 Check the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle. Replace the VDCCM only. < Ref. to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U).>
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.