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Daewoo Matiz (2003 year). Manual - part 148

ANTILOCK BRAKE SYSTEM 4F – 41

BLANK

4F – 42 ANTILOCK BRAKE SYSTEM

D17E304B

DIAGNOSTIC TROUBLE CODE (DTC) 0504

RIGHT REAR WHEEL SPEED SENSOR CIRCUIT OPEN OR 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 detects a short to battery, ground, or open in
the right rear wheel speed sensor circuit.

Cause(s)

The wheel speed circuit is open or shorted to the bat-
tery or ground.

There is a loose connection in the wheel speed cir-
cuit.

The wheel speed sensor resistance is very high.

The EBCM is malfunctioning.

Fail Action

This is a critical operational fault. The ABS is disabled
and the ABS warning lamp is turned on. The proportion-
ing 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 – 43

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 0504 – Right Rear Wheel Speed Sensor Circuit Open or Shorted

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Step

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Action

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Value(s)

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Yes

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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?

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1.0 k

1.5 k

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Go to Step 4

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Go to Step 2

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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?

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1.0 k

1.5 k

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Go to Step 4

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Go to Step 3

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Replace the wheel speed sensor.
Is the repair complete?

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–

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System OK

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–

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1. Disconnect the connector C202.
2. Use a DVM to measure the resistance between

terminal 2 of the connector C202 and terminal 9
of the EBCM connector.

Does the DVM show the specified value?

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less than 1

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Go to Step 6

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Go to Step 5

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Repair the high resistance between terminal 2 of the
connector C202 and terminal 9 of the EBCM con-
nector.
Is the repair complete?

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–

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System OK

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–

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Use a DVM to measure the resistance between ter-
minal 2 of the connector C202 and terminal 2 of the
right rear wheel speed sensor harness connector.
Is the resistance within the specified value?

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less than 1

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Go to Step 8

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Go to Step 7

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Repair the high resistance between terminal 2 of the
connector C202 and terminal 2 of the right rear
wheel speed sensor harness connector.
Is the repair complete?

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–

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System OK

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–

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Use a DVM to measure the resistance between ter-
minal 10 of the connector C202 and terminal 10 of
the EBCM connector.
Does the DVM show the specified value?

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less than 1

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Go to Step 10

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Go to Step 9

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Repair the high resistance between terminal 10 of
the connector C202 and terminal 10 of the EBCM
connector.
Is the repair complete?

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–

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System OK

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–

4F – 44 ANTILOCK BRAKE SYSTEM

DTC 0504 – Right Rear Wheel Speed Sensor Circuit Open or Shorted (Cont’d)

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Step

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Action

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Value(s)

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Yes

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Use a DVM to measure the resistance between ter-
minal 10 of the connector C202 and terminal 1 of the
right rear wheel speed sensor harness connector.
Is the resistance within specified value?

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less than 1

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Go to Step 12

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Go to Step 11

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Repair the high resistance between terminal 10 of
the connector C202 and terminal 1 of the right rear
wheel speed sensor harness connector.
Is the repair complete?

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–

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System OK

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–

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Use a DVM to measure the resistance between
ground and terminal 9 of the EBCM connector.
Does the DVM show the specified value?

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Go to Step 14

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Go to Step 13

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Repair the short to ground between terminal 2 of the
connector C202 and terminal 9 of the EBCM con-
nector.
Is the repair complete?

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–

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System OK

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–

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Use a DVM to measure the resistance between
ground and terminal 2 of the connector C202.
Does the DVM show the specified value?

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Go to Step 16

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Go to Step 15

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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?

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–

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System OK

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–

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Use a DVM to measure the resistance between
ground and terminal 10 of the EBCM connector.
Does the DVM show the specified value?

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Go to Step 18

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Go to Step 17

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Repair the short to ground between terminal 10 of
the connector C202 and terminal 10 of the EBCM
connector.
Is the repair complete?

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–

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System OK

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–

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Use a DVM to measure the resistance between
ground and terminal 10 of the connector C202.
Does the DVM show the specified value?

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Go to Step 20

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Go to Step 19

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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?

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–

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System OK

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–

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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?

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0 v

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Go to Step 22

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Go to Step 21

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Repair the short to voltage between terminal 2 of the
connector C202 and terminal 9 of the EBCM con-
nector.
Is the repair complete?

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–

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System OK

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–

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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?

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0 v

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Go to Step 24

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Go to Step 23

Content .. 146 147 148 149 ..