Note: If the harness is twisted off or fractured for tight pull, it must be replaced with new parts.
Especially when vehicle is moving, the sensor will move up and down, which may cause
instantaneous open/short circuit. As a result, sensor signal check must be carried out when
vehicle is moving.
2. When overheating or supercooling may be the main reason:
Heat the possibly faulted part with a blower; check for cold welding phenomenon with a cold spray.
3. When overlarge contact resistance of power supply circuit may be the main reason:
Open all electrical switches, including the headlight and rear defrosting lamp. If fault does not
show again, it can only be diagnosed and repaired when it comes out next time. Generally the
occasional dynamic fault will only get worse, not better.
IV. ABS Fault Diagnosis and Troubleshooting
1. Check ABS warning lamp
Check if ABS warning lamp is turned on in the following ways
(1) Turn the vehicle key to connect the circuit, and then ABS warning lamp is turned on and then
turned off after 3 seconds.
(2) Fault exists if not the same with the situation in (1); check the DTC and refer to DTC Check
Table.
(3) Refer to No DTC Fault Table if the warning lamp can not be turned on.
2. Regular Fault Table (Table 3-6).
Table 3-6
Warning lamp
Location Reason Structure
ABS EBD
Brake pipe installation error Wheel locked, braking deviation
Oil leakage of brake gear ABS and EBD abnormal start
Wire installation error Unable to brake
Vehicle
harness
Exhaust fault ABS performance decreased
Off Off
Motor Motor fault ABS unable to start On Off
ECU power cord fault ABS and EBD unable to start
Control valve power cord fault ABS and EBD unable to start
ECU poor grounding ABS and EBD unable to start
ECU fault ABS and EBD unable to start
On On
ECU
Motor power cord fault ABS unable to start On Off
One fault: ABS unable to start On Off
Sensor open/short circuit
Two faults: ABS/EBD unable to start On On
Gear ring fault
Sensor disturbance fault
One fault: ABS wrong start On Off
Wheel
speed
sensor
Air gap fault Two faults: ABS and EBD unable to start On On
3. DTC read and deletion without fault diagnostic instrument
(1) Purpose and condition of DTC read without diagnostic instrument
If no diagnostic instrument is available, ABS fault condition can be indicated and DTC can be read
through ABS warning lamp, so as to confirm and eliminate the fault. If the DTC is a 2 digital code,
refer to the number in the bracket of DTC Table in Section 24.
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