MI:DBA-CV5W:4B12:ABS:MIL on:DTC:C1044:YSI:

MI:DBA-CV5W:4B12:ABS:MIL on:DTC:C1044:YSI:

LTXHZ

4B12

W1CJA 6466

 

 

 

DTC C1044: Abnormality in periodical signal for RR wheel speed sensor

 

The pulse signals, which the wheel speed sensor creates, are
sent to ABS-ECU. ABS-ECU uses the frequency of the pulse
signals to determine the wheel speed.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-69

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

 

 

DTC SET CONDITIONS
ABS-ECU monitors the signals from each wheel speed sensor
while the vehicle is being driven. If any periodical drop is found
in  these  sensor  signals,  ABS-ECU  will  set  the  relevant
diagnostic trouble code.

PROBABLE CAUSES

Wheel bearing malfunction

Deformation of the wheel speed detection encoder

Missing teeth of the wheel speed detection encoder

Adhesion of foreign materials on the wheel speed detection
encoder

ABS-ECU malfunction

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

MB991974: ABS check harness

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Repair the CAN bus lines. (Refer to GROUP 54D - CAN

<a "gr00007800-54d.pdf"="">Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines

Q:Is DTC C1044 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. Check for wheel bearing looseness

NOTE: 

Loose wheel bearing may increase the gap between the

wheel speed sensor and the wheel speed detection magnet
encoder. Check the wheel bearing <RR> for looseness. <Refer
to GROUP 27A - On-vehicle<a "gr00003300-27a.pdf"=""> Service P.27A-4(FWD) or GROUP 27B
<a "gr00003400-27b.pdf"="">- On-vehicle Service P.27B-15(AWD).>

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace the rear wheel hub assembly.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-69

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS