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TROUBLESHOOTING ELECTRONICALLY CONTROLLED 4WD 27C-10 DIAGNOSIS CODE PROCEDURES Code No.C100A <FL>, C1015 <FR>, C1020 <RL>, C102B <RR>: Wheel Speed Sensor Circuit CAUTION • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior • Whenever the ECU is replaced, ensure that the CAN bus lines are normal. OPERATION 4WD-ECU receives the wheel speed data from DIAGNOSIS CODE SET CONDITION This diagnosis code is set when the abnormality • One or more of the wheel speed does not follow PROBABLE CAUSES • Malfunction of wheel speed sensor • Damaged harness wires and connectors • Malfunction of encoder for wheel speed detection • Malfunction of ABS/ASC-ECU • Malfunction of 4WD-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP − Troubleshooting ). After repairing the CAN bus line, go to Step 2. STEP 2. Check whether the diagnosis code is Q: Is the relevant wheel speed sensor diagnosis code No.C100A <FL>, C1015 <FR>, C1020 <RL>, or Go to Step 3. NO : This diagnosis is complete. STEP 3. M.U.T.-III other system diagnosis code. − Troubleshooting ) <Vehicles with ABS> or the ASC diagnosis code (Refer to GROUP 35C − Trou- bleshooting ) <Vehicles with ASC>. Q: Is the diagnosis code set? YES : Perform the relevant troubleshooting. NO : Go to Step 4. STEP 4. M.U.T.-III data list. • Item No.18: FL wheel speed sensor • Item No.19: FR wheel speed sensor • Item No.20: RL wheel speed sensor • Item No.21: RR wheel speed sensor Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Cope with Intermittent Malfunction ). NO : Replace the 4WD-ECU (Refer to U119A Chassis No. mismatch U1425 T/M CAN message U1427 Implausible wheel speed data U1428 Sensor Cluster CAN message Diagnosis code No. Diagnostic item Reference |