Mitsubishi Motors Service Manual

2018 / ECLIPSE CROSS / EC - Workshop Manual

35 -SERVICE BRAKES > 35C-ACTIVE STABILITY CONTROL SYSTEM (ASC) > TROUBLESHOOTING<ASC-ECU><ASC-ECU> > DIAGNOSIS CODE PROCEDURES > CODE NO. C1046, 1047, 1048, 1049 WHEEL SPEED SENSOR CONTROL PHASE TIME EXCEEDED

Code No. C1046 FL Wheel Speed Sensor Phase
Code No. C1047 FR Wheel Speed Sensor Phase
Code No. C1048 RL Wheel Speed Sensor Phase
Code No. C1049 RR Wheel Speed Sensor Phase

caution

If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which north and south pole sides of the magnets are arranged alternately) for detecting the wheel speed which rotates at the same speed of the wheels and wheel speed sensors. This sensor outputs frequency pulse signals in proportion to the wheel speed.
The pulse signals, which the wheel speed sensor creates, are sent to ASC-ECU. ASC-ECU uses the frequency of the pulse signals to determine the wheel speed.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if any malfunction below is found:

When the brake fluid pressure is decreased for a long time.
When the brake fluid pressure is held for a long time.

PROBABLE CAUSES

Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor and the magnetic encoder for wheel speed detection
Adhesion of foreign materials on the wheel speed sensor
Adhesion of foreign materials on the magnetic encoder for wheel speed detection
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the magnetic encoder for wheel speed detection
Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
Missing teeth of the magnetic encoder for wheel speed detection

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-IIISE CAN bus diagnosis

Use M.U.T.-IIISE to diagnose the CAN bus lines.

Is the check result normal?

Go to Step 3.

Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table

). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Is diagnosis code No.C1046, C1047, C1048 or C1049 set?

Go to Step 3.

This diagnosis is complete.

STEP 3. M.U.T.-IIISE diagnosis code

Code No.C1046 is set

Check that the diagnosis codes No.C100A, C1011, C1014, and C1041 are also set.

Code No.C1047 is set

Check that the diagnosis codes No.C1015, C101C, C101F, and C1042 are also set.

Code No.C1048 is set

Check that the diagnosis codes No.C1020, C1027, C102A, and C1043 are also set.

Code No.C1049 is set

Check that the diagnosis codes No.C102B, C1032, C1035, and C1044 are also set.

Are the diagnosis codes set?

Carry out the diagnosis for the relevant diagnosis codes.

Go to Step 4.

STEP 4. M.U.T.-IIISE data list

Check the following data list (Refer to

Item No.01: FL wheel speed sensor
Item No.02: FR wheel speed sensor
Item No.03: RL wheel speed sensor
Item No.04: RR wheel speed sensor

Is the check result normal?

Go to Step 10.

Go to Step 5.

STEP 5. Check the wiring harness between the ASC-ECU connector terminal and the wheel speed sensor connector terminal

Code No.C1046 is set

Check of short to power supply, short to earth, and open circuit in FL+, FL- line between ASC-ECU connector and front wheel speed sensor (LH) connector.

Code No.C1047 is set

Check of short to power supply, short to earth, and open circuit in FR+, FR- line between ASC-ECU connector and front wheel speed sensor (RH) connector.

Code No.C1048 is set

Check of short to power supply, short to earth, and open circuit in RL+, RL- line between ASC-ECU connector and rear wheel speed sensor (LH) connector.

Code No.C1049 is set

Check of short to power supply, short to earth, and open circuit in RR+, RR- line between ASC-ECU connector and rear wheel speed sensor (RH) connector.

Is the check result normal?

Go to Step 6.

Repair the connector(s) or wiring harness.

STEP 6. Check for wheel speed sensor installation

Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting bolt, etc.).

Is the check result normal?

Go to Step 7.

Reinstall the wheel speed sensor correctly (Refer to

<front> or

<rear>). Then go to Step 7.

STEP 7. Check for wheel speed sensor output current

Refer to

Is the check result normal?

Go to Step 8.

Replace the wheel speed sensor (Refer to

<front> or

<rear>). Then go to Step 11.

STEP 8. 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 for looseness. <Refer to GROUP 26 - Wheel Bearing Axial Play Check

. (front), GROUP 27A - Wheel Bearing Axial Play Check

(rear-2WD) or GROUP 27B - Wheel Bearing Axial Play Check

(rear-4WD)>

Is the check result normal?

Go to Step 9.

Replace the front hub assembly <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 - Hub and Knuckle Assembly

(front), GROUP 27A - Rear Axle Hub Assembly

(rear-2WD) or GROUP 27B - Rear Axle Hub Assembly

(rear-4WD)>.

STEP 9. Check of wheel speed detection encoder

Check the encoder for adhesion of foreign materials or deformation.

Is the check result normal?

Go to Step 10.

NO (Adhesion of foreign materials) : Remove the foreign materials and clean the encoder so as not to disturb the magnetization pattern on it while taking care of the magnet, magnetic substance, and magnetic attraction.

NO (Deformation) : Replace the front hub assembly <front> or rear wheel hub assembly <rear>. <Refer to GROUP 26 - Hub and Knuckle Assembly

(front), GROUP 27A - Rear Axle Hub Assembly

(rear-2WD) or GROUP 27B - Rear Axle Hub Assembly

(rear-4WD)>.

STEP 10. Check whether the diagnosis code is set again.

(1) Erase the diagnosis code.

(2) Drive the vehicle at 20 km/h or higher.

note	The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.

Is diagnosis code No.C1046, C1047, C1048 or C1049 set?

Replace the wheel speed sensor (Refer to

<front> or

<rear>). Then go to Step 11.

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions

STEP 11. Check whether the diagnosis code is set again.

(1) Erase the diagnosis code.

(2) Drive the vehicle at 20 km/h or higher.

note	The ABS warning lamp does not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.

Is diagnosis code No.C1046, C1047, C1048 or C1049 set?

Replace the hydraulic unit (integrated with ASC-ECU) (Refer to

This diagnosis is complete.