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Mitsubishi Outlander XL. Manual - part 631

DTC C1073: Faulty motor drive circuit

M13502000936USA0000010000

Power Supply Circuit

ETACS-
ECU

POWER
SUPPLY

ABS-ECU

FUSIBLE
LINK

IG1
RELAY

FUSIBLE
LINK

SOLENOID VALVE
POWER SUPPLY

MOTOR POWER
SUPPLY

IGNITION
SWITCH (IG1)

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

｠

ABS-ECU contains the power supply circuit (terminal No. 13)
for the pump motor. The pump motor is energized by the motor
switch, which is incorporated in ABS-ECU.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-87

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

｠

The pump motor switch, which is incorporated in ABS-ECU,
is always off unless the motor and solenoid valve check is
activated when the vehicle is started.

｠

ABS-ECU activates the pump motor by turning on the ECU
built-in pump motor switch.

DTC SET CONDITIONS
If the pump motor switch voltage drop indicates high value when
the pump motor operates or after the operation, the pump motor
operation is stopped and this diagnostic trouble code is set.

PROBABLE CAUSES

Current trouble

｠

Fusible link malfunction

｠

Damaged wiring harness and connectors

｠

Abnormality in battery or generator

｠

ABS-ECU malfunction

Past trouble

｠

Carry out diagnosis with particular emphasis on wiring
harness and connector failures between the power supply
circuit (A-01 ABS-ECU connector terminal No. 13) to the ABS-
ECU motor and the ground circuit (A-01 ABS-ECU connector
terminal No. 14). For diagnosis procedures, refer to How to
treat past trouble (Refer to GROUP 00 - How to Cope with
Intermittent Malfunction P.00-15).

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. Check whether the diagnostic trouble code is reset.

Q:Is DTC C1073 set?

YES:

Go to Step 3.

NO:

The procedure is complete.

35B-88

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

STEP 3. Fusible link check: Check the fusible link No. 26.

Q:Is the check result normal?

YES:

Go to Step 4.

NO:

Replace the fusible link No. 26.

STEP 4. Battery check
Refer to GROUP 54Aa - Battery Test P.54Aa-3.

Q:Is the battery in good condition?

YES:

Go to Step 5.

NO:

Charge or replace the battery.

STEP 5. Charging system check
Refer to GROUP 16a - Output Current Test P.16a-8.

Q:Is the charging system in good condition?

YES:

Go to Step 6.

NO:

Repair or replace the charging system component(s).

STEP 6. Voltage measurement at the A-01 ABS-ECU
connector

ZC601293 0026

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

(1)

Disconnect the connector, connect special tool MB991974 to
the harness-side connector, and measure the voltage 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 terminal No. 13 and the
body ground.

OK: 12 volts (Battery voltage)

Q:Is the check result normal?

YES:

Go to Step 8.

NO:

Go to Step 7.

STEP 7. Connector check: A-01 ABS-ECU connector

Q:Is the check result normal?

YES:

The open or short circuit may be present in the

solenoid valve power supply circuit. Repair the wiring
harness between the A-01 ABS-ECU connector terminal No.
13 and the fusible link No. 26.

NO:

Repair the defective connector.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-89

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

STEP 8. Resistance measurement at A-01 ABS-ECU
connector

ZC601293 0027

Check harness

ABS-ECU

MB991974

A-01 ABS-ECU
harness connector

(1)

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

NOTE:

Do not connect the special tool MB991974 to ABS-

ECU.

(2)

Resistance between terminal No. 14 and body ground

OK: Continuity exists (2 ohms or less)

Q:Is the check result normal?

YES:

Go to Step 10.

NO:

Go to Step 9.

STEP 9. Connector check: A-01 ABS-ECU connector

Q:Is the check result normal?

YES:

An open circuit may be present in the ground

circuit. Repair the wiring harness between the A-01 ABS-
ECU terminal No. 14 and the body ground.

NO:

Repair the defective connector.

STEP 10. Check whether the diagnostic trouble code is
reset.

(1)

Erase the diagnostic trouble code.

(2)

Drive the vehicle at 12mph (20 km/h) or more.

NOTE:

The ABS warning light does not turn OFF in some

cases unless the vehicle runs at 12mph (20 km/h) or
higher.

Q:Is DTC C1073 set?

YES:

Replace the ABS-ECU.

NO:

Intermittent malfunction. (Refer to GROUP 00 - How

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

35B-90

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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