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Mitsubishi Outlander XL. Manual - part 627

DTC C1046: FL wheel speed sensor control phase time exceeded

M13502000923USA0000010000

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(RH)

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis,
diagnose the CAN bus lines. (Refer to GROUP 54D, Trouble
code diagnosis P.54D-17).

CIRCUIT 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 ABS-ECU. ABS-ECU uses the frequency of the pulse
signals to determine the wheel speed.

DTC SET CONDITIONS
This diagnostic trouble 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.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-71

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

PROBABLE CAUSES

｠

Damaged wiring harness and connectors

｠

External noise interference

｠

Malfunction of wheel speed sensor

｠

ABS-ECU malfunction

｠

Excessive gap between the wheel speed sensor and the
wheel speed detection encoder

｠

Adhesion of foreign materials on the wheel speed sensor

｠

Adhesion of foreign materials on the wheel speed detection
encoder

｠

Wheel bearing malfunction

｠

Improper installation of the wheel speed sensor

｠

Deformation of the wheel speed detection encoder

｠

Disturbance of magnetization pattern for wheel speed
detection encoder

｠

Missing teeth of the wheel speed detection encoder

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

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 C1046 set?

YES:

Go to Step 3.

NO:

The procedure is complete.

STEP 3. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble codes C100A, C1011, C1014,
and C1041 are also set.

Q:Are DTC C100A, C1011, C1014, and C1041 also set?

YES:

Carry out the diagnosis for the relevant diagnostic

trouble codes, and then go to Step 12.

NO:

Go to Step 4.

STEP 4. M.U.T.-III data list
Check the following service data.

｠

Item No.01: FL wheel speed sensor

Q:Is the check result normal?

35B-72

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

YES:

Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

NO:

Go to Step 5.

STEP 5. Voltage measurement at the A-01 ABS-ECU
connector

ZC601293 0016

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the harness-side connector, and then measure
the resistance at the special tool connector side.

NOTE:

Do not connect the special tool MB991974 to ABS-

ECU.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor power
supply terminal (signal terminal) No. 18/the ground terminal
No. 19 and the body ground.

OK: 0 volt

Q:Is the check result normal?

YES:

Go to Step 6.

NO (Not normal at the terminal No. 18 or 19):

Go to Step

STEP 6. Resistance measurement at A-01 ABS-ECU
connector

ZC601293 0017

Check harness

ABS-ECU

MB991974

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the harness-side connector, and then measure
the resistance at the special tool connector side.

NOTE:

Do not connect the special tool MB991974 to ABS-

ECU.

(2)

Resistance between the wheel speed sensor power supply
terminal (signal terminal) No. 18/the ground terminal No. 19
and the body ground

OK: No continuity

Q:Is the check result normal?

YES:

Go to Step 9.

NO (Not normal at the terminal No. 18 or 19):

Go to Step

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-73

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

STEP 7. Connector check: A-01 ABS-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

YES:

Go to Step 8.

NO:

Repair the defective connector.

STEP 8. Wiring harness check between A-01 ABS-ECU
connector terminal No. 18/19 and A-11 wheel speed sensor
<FL> connector terminal No. 1/2

｠

Check for short circuit in wheel speed sensor <FL> circuit

Q:Is the check result normal?

YES:

Replace the wheel speed sensor <FL>.

NO:

Repair the wiring harness.

STEP 9. Voltage measurement at the A-01 ABS-ECU
connector

ZC601292 0006

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the ABS-ECU-side connector and harness-
side connector, and then measure the voltage at the special
tool connector side.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor circuit
power supply terminal (signal terminal) No. 18 and the body
ground.

OK: Approximately battery voltage

Q:Is the check result normal?

YES:

Go to Step 12.

NO:

Go to Step 10.

STEP 10. Connector check: A-01 ABS-ECU connector, A-11
wheel speed sensor <FL> connector

Q:Is the check result normal?

YES:

Go to Step 11.

NO:

Repair the defective connector.

STEP 11. Wiring harness check between A-01 ABS-ECU
connector terminal No. 18/19 and A-11 wheel speed sensor
<FL> connector terminal No. 1/2

｠

Check for open circuit in wheel speed sensor <FL> circuit.

Q:Is the check result normal?

YES:

Replace the wheel speed sensor.

NO:

Repair the wiring harness.

35B-74

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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