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0 SOHC > Brake > ABS/ESP(MGH-40) > C2402 Motor

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C2402 Motor electrical > General Information

Component Location

General Description
The ABS ECU supplies battery power to the electric motor by way of a motor relay which is controlled by the Electronic Control Unit
(ECU).
The electric motor pump supplies hydraulic pressure to all wheel brake calipers by operating the piston inside the pump.

DTC Description
The ABS ECU monitors the pump motor relay or fuse open, open or short in motor or motor lock and then sets this code if a
malfunction is detected.

DTC Detecting Condition

Possible
Item Detecting Condition
cause
DTC Strategy ● Battery Voltage Monitoring

Case1
● After
(Motor
motor
Relay
relay is
Open
Enable ● If the motor relay is switched ON and motor voltage < (IGN voltage switched
or
Conditions - 4V±0.5V) continued for 49msec, the failure is detected. OFF, VMR
Motor
is
Short
measured.
to
If the time
GND)
which
VMR >
1±0.1V is
less than
evaluation
time,
Case2 recheck is
(Motor Enable performed
 Lock) Conditions again for a
maximum
of three
times.
When
VMR is
not normal
Case3
even on
(Motor
the third
Open,
Enable ● After 1.8sec from the time that motor relay is switched OFF, VMR recheck,
Motor
Conditions > 4±0.5V continued for 1.8sec, the failure is detected. the
Short
● Open controller
to
or short recognizes
BATT)
of it as
power failure.
supply Case4 ● If the
circuit (Motor motor
(ABS1) Fuse relay is
● Faulty Open) switched
HECU OFF and
● ABS/VDC functions are inhibited, EBD function is allowed and the VMRP
ABS/VDC warning lamps are activated. (Motor
Enable power
Conditions supply
voltage) <
Fail Safe 4±0.5V
continued
for 1sec,
the failure
is
detected.
C2402 Motor electrical > Scantool Diagnostics > Monitor Actuation Test
Monitor Actuation Test
1. Connect scantool to Data Link Connector(DLC).
2. Ignition "ON" & Engine "OFF".
3. Select the "Actuation Test" mode on the scantool.
4. Inspect operating status of Motor with Actuation Test.
1) Specification : It’s normal if operating sound is heard.

Fig 1) Test Condition : Ignition "ON" & Engine "OFF".

Ex) Actuation Test on Motor
5. Does motor operate normally?

▶ Fault is intermittent caused by poor connection in power harness (ABS2) and/or HECU’s connector or was repaired and HECU
memory was not cleared.
 ▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
▶ Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Go to "Terminal and Connector Inspection" procedure.

C2402 Motor electrical > Inspection/Repair > W/Harness Inspection

Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by
interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Go to "Power Circuit Inspection" procedure.

Power Supply Circuit Inspection

■ Open or Short Check
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between power(ABS1) terminal of the HECU harness connector and chassis ground.
1) Specification : B+

3. Is the measured value within specifications?

▶ Go to "Ground Circuit Inspection" procedure.

▶ Check for open or blown 40A (ABS1) fuse referring to "Circuit Diagram".
▶ Repair open or short in power circuit between battery and HECU harness connector and then, go to "Verification of vehicle
 Repair" procedure.

Ground Circuit inspection

■ Open or Short Check
1. Ignition "OFF" & Engine "OFF".
2. Disconnect the HECU connector.
3. Measure resistance between ground terminal of the HECU harness connector and chassis ground.
1) Specification : Approx. below 1Ω

4. Is the measured value within specifications?

▶ Substitute with a known-good HECU and check for proper operation.

▶ If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.

▶ Repair open or short in ground circuit between HECU harness connector and chassis ground, and then go to "Verification of
vehicle Repair" procedure.

C2402 Motor electrical > Verification of Vehicle Repair

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Using a scantool, Check DTC present.
5. Are any DTCs present ?

▶ Go to the applicable troubleshooting procedure.

▶ System performing to specification at this time.