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
