4F–48 ANTILOCK BRAKE SYSTEM
DAEWOO M-150 BL2
D17E304B
DIAGNOSTIC TROUBLE CODE (DTC) 0506
RIGHT REAR WHEEL SPEED SENSOR CIRCUIT
INTERMITTENT SHORTED
Circuit Description
As a toothed ring passes by the wheel speed sensor,
changes in the electromagnetic field cause the wheel
speed sensor to produce a sinusoidal (AC) voltage sig-
nal whose frequency is proportional to the wheel speed.
The magnitude of this signal is directly related to wheel
speed and the proximity of the wheel speed sensor to
the toothed ring often referred to as the air gap.
Diagnosis
This test intermittent the right rear wheel speed sensor
circuit.
Cause(s)
The wheel speed sensor is intermittent shorted to the
battery or ground.
There is a loose connection in the wheel speed sen-
sor circuit.
There is a loose connection in the EBCM.
The EBCM is malfunctioning.Fail Action
This is a critical operational fault. The ABS is disabled
and the ABS warning lamp repeat intermittent turned on,
and off. The proportioning is operation.
Diagnostic Aids
An ‘‘intermittent’’ malfunction may be caused by a poor
connection, rubbed through wire insulation, or a wire
that is broken inside the insulation.
Thoroughly check any circuitry suspected of causing the
intermittent complaint. Look for backed out terminals,
improper mating, broken locks, improperly formed or
damaged terminals, poor terminal to wiring connections,
or physical damage to the wiring harness.
Wheel speed sensor resistance will increase as the sen-
sor temperature increases.
When replacing a wheel speed sensor, inspect the sen-
sor terminals and harness connector for corrosion and/
or water intrusion. If evidence of corrosion or water
ANTILOCK BRAKE SYSTEM 4F–49
DAEWOO M-150 BL2
intrusion exists, replace the wheel speed sensor har-
ness. If replacing a wheel speed sensor harness, in-
spect the sensor terminals. If you find evidence of
corrosion or water intrusion, replace the wheel speed
sensor. Refer to “Rear Wheel Speed Sensor” in this sec-
tion.Important: Wheel speed sensor intermittent malfunc-
tions may be difficult to locate. Take care not to disturb
any electrical connections before performing an indi-
cated step of this table. That will ensure that an intermit-
tent connection will not be corrected before the source
of the malfunction is found.
DTC 0506 – Right Rear Wheel Speed Sensor Circuit Intermittent Shorted
Step Action Value(s) Yes No
1
1. Turn the ignition switch to OFF.
2. Disconnect the EBCM harness connector from
the EBCM.
3. Use a digital voltmeter (DVM) to measure the
resistance between terminals 9 and 10 of
connector on the EBCM harness.
Is the resistance within the specified value?
1.0 k to
1.5 k
Go to Step 4
Go to Step 2
2
1. Disconnect the harness from the right rear wheel
speed sensor.
2. Use a DVM to measure the resistance between
terminals 1 and 2 of the right rear wheel speed
sensor connector.
Is the resistance within the specified value?
1.0 k to
1.5 k
Go to Step 4
Go to Step 3
3
Replace the wheel speed sensor.
Is the repair complete?
–
System OK
–
4
Use a DVM to measure the resistance between
ground and terminal 9 of the EBCM connector.
Does the DVM show the specified value?
Go to Step 6
Go to Step 5
5
Repair the short to ground between terminal 2 of the
connector C202 and terminal 9 of the EBCM con-
nector.
Is the repair complete?
–
System OK
–
6
Use a DVM to measure the resistance between
ground and terminal 2 of the connector C202.
Does the DVM show the specified value?
Go to Step 8
Go to Step 7
7
Repair the short to ground between terminal 2 of the
connector C202 and terminal 2 of the right rear
wheel speed sensor harness connector.
Is the repair complete?
–
System OK
–
8
Use a DVM to measure the resistance between
ground and terminal 10 of the EBCM connector.
Does the DVM show the specified value?
Go to Step 10
Go to Step 9
9
Repair the short to ground between terminal 10 of
the connector C202 and terminal 10 of the EBCM
connector.
Is the repair complete?
–
System OK
–
10
Use a DVM to measure the resistance between
ground and terminal 10 of the connector C202.
Does the DVM show the specified value?
Go to Step 12
Go to Step 11
4F–50 ANTILOCK BRAKE SYSTEM
DAEWOO M-150 BL2
DTC 0506 – Right Rear Wheel Speed Sensor Circuit Intermittent Shorted (Cont’d)
Step Action Value(s) Yes No
11
Repair the short to ground between terminal 10 of
the connector C202 and terminal 1 of the right rear
wheel speed sensor harness connector.
Is the repair complete?
–
System OK
–
12
1. Turn the ignition switch to ON.
2. Use a DVM to measure the voltage between
ground and terminal 9 of the EBCM connector.
Is the voltage within the specified value?
0 v
Go to Step 14
Go to Step 13
13
Repair the short to voltage between terminal 2 of the
connector C202 and terminal 9 of the EBCM con-
nector.
Is the repair complete?
–
System OK
–
14
1. Turn the ignition switch to ON.
2. Use a DVM to measure the voltage between
ground and terminal 2 of the connector C202.
Is the voltage within the specified value?
0 v
Go to Step 16
Go to Step 15
15
Repair the short to voltage between terminal 2 of the
connector C202 and terminal 2 of the right rear
wheel speed sensor harness connector.
Is the repair complete?
–
System OK
–
16
1. Turn the ignition switch to ON.
2. Use a DVM to measure the voltage between
terminal 10 of the connector C202 and terminal
10 of the EBCM connector.
Is the voltage within the specified value?
0 v
Go to Step 18
Go to Step 17
17
Repair the short to voltage between terminal 10 of
the connector C202 and terminal 10 of the EBCM
connector.
Is the repair complete?
–
System OK
–
18
1. Turn the ignition switch to ON.
2. Use a DVM to measure the voltage between
ground and terminal 10 of the connector C202.
Is the voltage within the specified value?
0 v
Go to Step 20
Go to Step 19
19
Repair the short to voltage between terminal 10 of
the connector C202 and terminal 1 of the right rear
wheel speed sensor harness connector.
Is the repair complete?
–
System OK
–
20
Replace the EBCM.
Is the repair complete?
–
System OK
–
