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III. Trouble Diagnosis and Troubleshooting
1
．
Checking Sequence
2
．
Trouble Diagnosis and Troubleshooting of MGH-25 ABS
2.1 Checking of ABS and EBD Warning Lamp
Check if the ABS and EBD warning lamps are illuminated in accordance with following:
① Rotate the vehicle key to turn on the power. The ABS warning lamp will illuminate and then
go off in 3s.
② It indicates the trouble if the status mentioned in ① is not present and it’s necessary to
check the trouble code with reference to the trouble code checklist.
③ If the warning lamps are completely not illuminated, please refer to the trouble checklist
without trouble code.
2.2 Table for Common Troubles
Warning lamp
Position Cause Structure
ABS EBD
Incorrect assembling of
brake hose
Locked wheels and brake off-
tracking
Brake oil leakage Poor start of ABS and EBD
Incorrect wiring
installation
Brake failure
Vehicle
harness
Air discharge trouble Deteriorated ABS performance
Off Off
Motor Motor trouble ABS start failure On Off
Trouble of ECU power line
Start failure of ABS and EBD
Trouble of valve power
line
Start failure of ABS and EBD
Poor grounding of ECU Start failure of ABS and EBD
ECU trouble Start failure of ABS and EBD
On On
ECU
Trouble of motor wire line
ABS start failure On Off
In event of whichever trouble: ABS
start failure
On Off
Sensor open-circuit/short-
circuit
In event of both troubles: Start failure
of ABS/EBD
On On
In event of whichever trouble:
Incorrect start of ABS
On Off
Speed
sensor
Gear ring trouble, sensor
interference trouble, air gap
trouble
In event of both troubles: Start failure
of ABS/EBD
On On
Regular checking
C
speed sensor
•
• ECU trouble code
determination
• Warning lamp status
determination
C
result
•
Sensor air gap determination
• Sensor assembling status
determination
•
determination
• Trouble code record
•
Valve status determination
•
Pipeline assembling status
determination
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