2004 DAEWOO LACETTI ignition

ANTILOCK BRAKE SYSTEM 4F – 39
DAEWOO V–121 BL4
J3B14F09
DLC
(Data Link
Connector)
EBCM
DK BLUDK BLU
BLK/WHTC202
C110
11 2
1912 19
G106
DIAGNOSTIC TROUBLE CODE (DTC) C0080/C0085
LEFT REAR INLET AND OUTLET VALVE SOLENOID
FAULT
Circuit Description
The solenoid valve coil circuits are supplied with power
from the battery when the valve relay is energized.
Switched ground is provided by the electronic brake con-
trol module (EBCM) to each coil.
Diagnosis
This procedure checks whether the left rear inlet and outlet
valves are functioning.
Cause(s)
S A valve has failed.S A solenoid coil is open or shorted.
Fail Action
ABS is disabled, and the ABS warning lamp is turned ON
for the remainder of the ignition cycle. EBD is disabled. If
the failure is intermittent, the EBCM will enable the system
at the next ignition cycle and set a history DTC.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. This begins the test of the inlet valve.
3. This tests the outlet valve.

4F – 40IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
DTC C0080/C0085 – Left Rear Inlet and Outlet Valve Solenoid Fault
StepActionValue(s)YesNo
11. Raise and suitably support the vehicle at the
corner being tested.
2. Turn the ignition switch to ON.
3. Install the scan tool to the Data Link Connector
(DLC) and select ”Wheel rear left” to begin the
solenoid tests at that wheel. This will test both
the inlet and the outlet valves.
4. When the scan tool indicates ”Pressure hold,”
depress and hold the brake pedal until the end
of the test.
5. Have an assistant attempt to rotate the wheel.
Can the wheel be rotated?–Go to Step 2Go to Step 6
21. Maintain pressure on the brake pedal.
2. When the scan tool indicates ”Pressure in-
crease,” have an assistant attempt to rotate the
wheel again.
Can the wheel be rotated now?–Go to Step 6Go to Step 3
31. Maintain pressure on the brake pedal.
2. When the scan tool indicates ”Pressure release
on,” have an assistant attempt to rotate the
wheel again.
Can the wheel be rotated?–Go to Step 4Go to Step 6
41. Release brake pedal pressure when the scan
tool indicates ”Pressure release off.”
2. Clear all DTCs.
3. Road test the vehicle.
Does the DTC set again?–Go to Step 6Go to Step 5
51. Check the wiring harness and connector termi-
nals for an intermittent problem.
2. Repair any problem found.
Is the repair complete?–System OK–
6Replace the ABS unit.
Is the repair complete?–System OK–

ANTILOCK BRAKE SYSTEM 4F – 41
DAEWOO V–121 BL4
J3B14F09
DLC
(Data Link
Connector)
EBCM
DK BLUDK BLU
BLK/WHTC202
C110
11 2
1912 19
G106
DIAGNOSTIC TROUBLE CODE (DTC) C0090/C0095
RIGHT REAR INLET AND OUTLET VALVE SOLENOID
FAULT
Circuit Description
The solenoid valve coil circuits are supplied with power
from the battery when the valve relay is energized.
Switched ground is provided by the electronic brake con-
trol module (EBCM) to each coil.
Diagnosis
This procedure checks whether the right rear inlet and out-
let valves are functioning.
Cause(s)
S A valve has failed.S A solenoid coil is open or shorted.
Fail Action
ABS is disabled, and the ABS warning lamp is turned ON
for the remainder of the ignition cycle. EBD is disabled. If
the failure is intermittent, the EBCM will enable the system
at the next ignition cycle and set a history DTC.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. This begins the test of the inlet valve.
3. This tests the outlet valve.

4F – 42IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
DTC C0090/C0095 – Right Rear Inlet and Outlet Valve Solenoid
Fault
StepActionValue(s)YesNo
11. Raise and suitably support the vehicle at the
corner being tested.
2. Turn the ignition switch to ON.
3. Install the scan tool to the Data Link Connector
(DLC) and select ”Wheel rear right” to begin
the solenoid tests at that wheel. This will test
both the inlet and the outlet valves.
4. When the scan tool indicates ”Pressure hold,”
depress and hold the brake pedal until the end
of the test.
5. Have an assistant attempt to rotate the wheel.
Can the wheel be rotated?–Go to Step 2Go to Step 6
21. Maintain pressure on the brake pedal.
2. When the scan tool indicates ”Pressure in-
crease,” have an assistant attempt to rotate the
wheel again.
Can the wheel be rotated now?–Go to Step 6Go to Step 3
31. Maintain pressure on the brake pedal.
2. When the scan tool indicates ”Pressure release
on,” have an assistant attempt to rotate the
wheel again.
Can the wheel be rotated?–Go to Step 4Go to Step 6
41. Release brake pedal pressure when the scan
tool indicates ”Pressure release off.”
2. Clear all DTCs.
3. Road test the vehicle.
Does the DTC set again?–Go to Step 6Go to Step 5
51. Check the wiring harness and connector termi-
nals for an intermittent problem.
2. Repair any problem found.
Is the repair complete?–System OK–
6Replace the ABS unit.
Is the repair complete?–System OK–

ANTILOCK BRAKE SYSTEM 4F – 43
DAEWOO V–121 BL4
J3B14F04
60A Ef230A Ef5
2
42
C107 C105
2
C110
G106
A19
A13 A1 A14
C110 C202
C202WHT LT GRN
DK
GRN LT GRN/
BLK
BLK
DK BLUDK BLU
PPL/WHT
PPL/WHT ABS
TCS Parking
Brake
Hot at all times
RED REDRED/WHT
Ignition
Switch
RED
RED
I/P Cluster
EBCM8
20
22 2216 41
1211
18 1621
1
C107
10A F410AF11
32 31
43
6 62 C201
C201 C201C201
C110 C202
Hot in Run and Start
30
4
1711
C202
15
B15
DLC
(Data Link
Connector)12
G106
BLK/WHTOil Feeding
Connector
”2” Ter.
BRNBRN BRN
BRN PNK PNK PNK
19J1
59B1
ONStart Lock
Acc
IG1
19
DIAGNOSTIC TROUBLE CODE (DTC) C0110
PUMP MOTOR CIRCUIT MALFUNCTION
Circuit Description
When the electronic brake control module (EBCM)
grounds the pump motor relay, it closes and provides bat-
tery voltage to the pump motor if the valve relay is closed.
The EBCM senses the voltage applied to the pump motor
to verify motor operation.
Diagnosis
This DTC sets when the EBCM detects B+ without motor
relay activation or if the EBCM does not detect B+ after
motor relay activation.
Cause(s)
S There is a faulty terminal in pump motor connector.
S There is a faulty terminal in EBCM connector.
S There is a problem in the ABS wiring harness.
S There is high resistance in the chassis ground.
S The EBCM is defective.S There is a problem in the wiring from pump motor
connector to the motor.
Fail Action
ABS is disabled, and the ABS warning lamp is ON. EBD
is disabled.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. This step checks for connector damage.
3. This step checks for a poor ground connection.
7. This step checks for a possible problem with the
motor connector at the ABS unit.
Diagnostic Aids
It is very important to perform a thorough inspection of the
wiring and the connectors. Failure to do so may result in
misdiagnosis, causing part replacement with reappear-
ance of the malfunction.

ANTILOCK BRAKE SYSTEM 4F – 45
DAEWOO V–121 BL4
J3B14F04
60A Ef230A Ef5
2
42
C107 C105
2
C110
G106
A19
A13 A1 A14
C110 C202
C202WHT LT GRN
DK
GRN LT GRN/
BLK
BLK
DK BLUDK BLU
PPL/WHT
PPL/WHT ABS
TCS Parking
Brake
Hot at all times
RED REDRED/WHT
Ignition
Switch
RED
RED
I/P Cluster
EBCM8
20
22 2216 41
1211
18 1621
1
C107
10A F410AF11
32 31
43
6 62 C201
C201 C201C201
C110 C202
Hot in Run and Start
30
4
1711
C202
15
B15
DLC
(Data Link
Connector)12
G106
BLK/WHTOil Feeding
Connector
”2” Ter.
BRNBRN BRN
BRN PNK PNK PNK
19J1
59B1
ONStart Lock
Acc
IG1
19
DIAGNOSTIC TROUBLE CODE (DTC) C0121
VALVE RELAY CIRCUIT MALFUNCTION
Circuit Description
When the ABS is active, the valve relay provides voltage
to actuate the solenoid valves. The valves do not use this
voltage unless the ABS control module provides the
ground for each solenoid coil.
DTC C0121 will set if the valve relay voltage is low or if the
relay supply line is at 12 volts when the ABS control mod-
ule is not requesting it. This DTC will also set if the ABS
control module detects three or more solenoid valve cir-
cuits are open or shorted during the self–test.
Diagnosis
This procedure checks whether there is a poor ground
connection for the electronic brake control module
(EBCM).Cause(s)
S A connector terminal is corroded.
S The wiring harness is damaged.
S The ground terminal is not conducting properly.
S The EBCM is defective.
Fail Action
ABS/EBD is disabled, and the ABS / EBD warning lamp
is turned ON for the remainder of the ignition cycle. If the
failure is intermittent, the control module will enable the
system at the next ignition cycle and set a history DTC
C0121.
Diagnostic Aids
It is very important to perform a thorough inspection of the
wiring and the connectors. Failure to do so may result in
misdiagnosis, causing part replacement with reappear-
ance of the malfunction.

4F – 54IANTILOCK BRAKE SYSTEM
DAEWOO V–121 BL4
J3B14F04
60A Ef230A Ef5
2
42
C107 C105
2
C110
G106
A19
A13 A1 A14
C110 C202
C202WHT LT GRN
DK
GRN LT GRN/
BLK
BLK
DK BLUDK BLU
PPL/WHT
PPL/WHT ABS
TCS Parking
Brake
Hot at all times
RED REDRED/WHT
Ignition
Switch
RED
RED
I/P Cluster
EBCM8
20
22 2216 41
1211
18 1621
1
C107
10A F410AF11
32 31
43
6 62 C201
C201 C201C201
C110 C202
Hot in Run and Start
30
4
1711
C202
15
B15
DLC
(Data Link
Connector)12
G106
BLK/WHTOil Feeding
Connector
”2” Ter.
BRNBRN BRN
BRN PNK PNK PNK
19J1
59B1
ONStart Lock
Acc
IG1
19
DIAGNOSTIC TROUBLE CODE (DTC) C0550
ABS CONTROL MODULE INTERNAL FAULT
Circuit Description
The ABS control module performs various diagnostic
checks on itself. If it finds a problem, it sets DTC C0550.
Diagnosis
This procedure checks whether there is a poor ground
connection for the electronic brake control module
(EBCM).
Cause(s)
S A connector terminal is corroded.
S The EBCM is malfunctioning.
Fail Action
ABS is disabled, and the ABS warning lamp is turned ON.EBD is disabled. If the failure is intermittent, the control
module will enable the system at the next ignition cycle
and will store a history DTC C0550.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
3. This step begins the testing for a poor voltage or
ground connection.
Diagnostic Aids
It is very important to perform a thorough inspection of the
wiring and the connectors. Failure to inspect the wiring
and the connectors carefully and completely may result in
misdiagnosis, causing part replacement with the reap-
pearance of the malfunction.

ANTILOCK BRAKE SYSTEM 4F – 55
DAEWOO V–121 BL4
DTC C0550 – ABS Control Module Internal Fault
StepActionValue(s)YesNo
1Use the scan tool to determine if any other DTCs are
set.
Are other DTCs set?–Go to the
tables for the
other DTCsGo to Step 2
2Clear all DTCs and road test the vehicle.
Does DTC C0550 set again?–Go to Step 4Go to Step 3
31. Check all wiring harness connectors and termi-
nals, especially those at the EBCM, for any
condition that could cause an intermittent.
2. Repair any problems found.
Is the repair complete?–System OK–
41. Turn the ignition switch to OFF.
2. Disconnect EBCM connector J1.
3. Turn the ignition switch to ON.
4. Measure the voltage between ground and ter-
minals 15, 17, and 18 of the EBCM harness
connector J1.
Is the voltage equal to the specified value?11–14 vGo to Step 6Go to Step 5
51. Check the voltage supply and the ground con-
nections to the EBCM.
2. Repair any open or high resistance found.
Is the repair complete?–System OK–
6Check the EBCM connector J1 for any ineffective
terminals.
Are there any problems?–Go to Step 7Go to Step 8
7Repair any connector problem found.
Is the repair complete?–System OK–
8Clear all DTCs and road test the vehicle.
Does DTC C0550 set again?–Go to Step 9System OK
9Replace the ABS unit.
Is the repair complete?–System OK–