SUZUKI GRAND VITARA 2002 2.G Service Workshop Manual

YH4
GRAND
VITARA
5E1-20 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
TABLE ± E EBD WARNING LAMP (BRAKE WARNING LAMP) CHECK-LAMP
COMES ªONº STEADY
CIRCUIT DESCRIPTION
EBD warning lamp (brake warning lamp) is controlled by parking brake switch, brake fluid level switch and ABS
control module / hydraulic unit assembly through lamp driver module in combination meter. Refer to ªTABLE-Aº for
circuit diagram.
STEP
ACTIONYESNO
11) Make sure that:

Parking brake is completely released.Go to step 2.Release parking
brake completely

Brake fluid level is upper than the minimum level.
Are the check results OK?and / or replenish
brake fluid.
2Does ªABSº warning lamp come on?Perform ªTABLE Bº
previously
outlined.Go to step 3.
31) Disconnect ABS hydraulic unit / control module
connector.
2) Check for proper connection to ABS hydraulic unit /
control module connector at terminals ªA26º.
3) If OK, apply chocks to wheels and select gear in neutral
position (P range for A / T).
4) Keep brake pedal depressed and start engine.
Release parking brake.
5) Connect terminal ªA26º of disconnected connector to
ground using service wire.
Does EBD warning lamp (brake warning lamp) turn off?Substitute a
known-good ABS
hydraulic unit /
control module
assembly and
recheck.ªBrº circuit open.
If wire and
connection are
OK, replace
combination
meter.

YH4
GRAND
VITARA
ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL) 5E1-21
1. Ignition switch
2. G sensor
3. ABS hydraulic unit control
module assembly
4. ABS hydraulic unit/
control module
connector of harness
O/G
DTC 15 (DTC C1015) ± G SENSOR CIRCUIT (FOR 4WD MODEL ONLY)
DESCRIPTION
While a vehicle is at stop or running, if the potential difference between the sensor signal terminal ªA14º and the
sensor ground terminal ªA4º is not within the specified voltage value, or if the signal voltage while at a stop does
not vary from that while running, this DTC is set.
Therefore, this DTC may be set when a vehicle is lifted up and its wheel(s) is turned. In such case, clear the DTC
and check again.

YH4
GRAND
VITARA
5E1-22 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
1. ABS hydraulic
unit / control
module connector
INSPECTION
STEPACTIONYESNO
1Is G sensor installed floor securely?Go to step 2.Tighten sensor or
bracket screw
securely. If not,
using new screw.
21) Ignition switch OFF.
2) Remove G sensor with bracket.
3) Check for proper connection to G sensor.
4) If OK then check G sensor referring to item
INSPECTION of G sensor.
Is it in good condition?Go to step 3.Replace G sensor.
31) Disconnect connectors from ABS hydraulic unit /
control module assembly (See Fig. 1) and G sensor.
2) Check for proper connection to ABS control module
at terminals ªA14º and ªA4º.
3) If OK, then turn ignition switch ON and measure
voltage between ªB / Wº terminal of sensor
connector and body ground.
Is it 10 ± 14 V?Go to step 4.ªB / Wº circuit open.
4Measure voltage between ªO / Wº terminal of sensor
connector and body ground.
Is it 0 V?Go to step 5.ªO / Wº circuit
shorted to power
circuit.
51) Ignition switch OFF.
2) Check that ªO / Wº circuit is free from open
or short to ground and ªO / Gº circuit.
Is it in good condition? (See Fig. 2)ªO / Gº circuit open.
If circuit is OK, substi-
tute a known-good
ABS hydraulic
unit / control module
assembly.ªO / Wº circuit open
or shorted to
ground or ªO / Gº
circuit.
Fig. 1 Fig. 2

YH4
GRAND
VITARA
ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL) 5E1-23
1. Ignition switch
2. ABS hydraulic unit /
control module assembly
3. Left-front wheel speed
sensor
4. Right-front wheel speed
sensor
5. Left-rear wheel speed
sensor
6. Right-rear wheel speed
sensor
7. ABS hydraulic unit /
control connector of harness
DTC 21 (DTC C1021), 22 (DTC C1022) ± RIGHT-FRONT WHEEL SPEED SENSOR
CIRCUIT
DTC 25 (DTC C1025), 26 (DTC C1026) ± LEFT-FRONT WHEEL SPEED SENSOR
CIRCUIT
DTC 31 (DTC C1031), 32 (DTC C1032) ± RIGHT-REAR WHEEL SPEED SENSOR
CIRCUIT
DTC 35 (DTC C1035), 36 (DTC C1036) ± LEFT-REAR WHEEL SPEED SENSOR
CIRCUIT
DESCRIPTION
The ABS control module monitors the voltage at the positive (+) terminal of each sensor while the ignition switch
is ON. When the voltage is not within the specified range, an applicable DTC will be set. Also, when no sensor signal
is inputted at starting or while running, an applicable DTC will be set.
NOTE:
When the vehicle was operated in any of the following ways, one of these DTC's may be set even when
the sensor is in good condition. If such possibility is suspected, repair the trouble (dragging of brake, etc.)
of the vehicle, clear DTC once and then after performing the driving test as described in Step 2 of ªABS
DIAG. FLOW TABLEº, check whether or not any abnormality exists.
± The vehicle was driven with parking brake pulled.
± The vehicle was driven with brake dragging.
± Wheel spin occurred while driving.
± Wheel(s) was turned while the vehicle was jacked up.
± The vehicle was stuck.

YH4
GRAND
VITARA
5E1-24 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
INSPECTION
STEPACTIONYESNO
11) Disconnect the applicable sensor connector with
ignition switch OFF.
2) Measure resistance between sensor terminals.
Resistance of wheel speed sensor:
1.2 ± 1.6 k
(at 20C, 68F)
3) Measure resistance between each terminal and
body ground.
Insulation resistance: 1M
or higher
Were measured resistance values in step 2) and 3)
as specified? (See Fig. 1)Go to step 2.Replace sensor.
21) Ignition switch OFF.
2) Disconnect connector from ABS hydraulic
unit / control module assembly. (See Fig. 2)
3) Check for proper connection to ABS hydraulic unit /
control module assembly at each sensor terminal.
4) If OK then, turn ignition switch ON and measure
voltage between sensor positive terminal of module
connector and body ground.
Is it 0 V?Go to step 3.Sensor positive
circuit shorted to
power.
31) Ignition switch OFF.
2) Connect connector to sensor.
3) Measure resistance between sensor terminals at
module connector.
4) Measure resistance between sensor positive
terminal and negative terminal of module connector,
between positive terminal and body ground.
Are measured resistance values within each specified
range described in above step 1?Go to step 4.Circuit open or
shorted to
ground.
41) Remove wheel speed sensor.
2) Check sensor for damage or foreign material being
attached.
Is it in good condition? (See Fig. 3)Go to step 5.Clean or replace
sensor.
5Check visually through wheel speed sensor
installation hole for following.

Rotor neither missing or damaged.

No foreign material being attached.

Rotor not being eccentric.

Wheel bearing free from excessive play.
Are they in good condition? (See Fig. 4)Go to step 6.Clean, repair or
replace.
61) Install sensor to knuckle or axle housing.
2) Tighten sensor bolt to specified torque and check
that there is not any clearance between sensor and
knuckle or axle housing. (See Fig. 5)
Replace sensor if any.
Referring to item OUTPUT VOLTAGE INSPECTION of
FRONT WHEEL SPEED SENSOR, check output voltage
or waveform of sensor. Is proper output voltage or
waveform obtained?Substitute a
known-good ABS
hydraulic unit /
control module
assembly and
recheck.Replace sensor
and recheck.

YH4
GRAND
VITARA
ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL) 5E1-25
1. ABS hydraulic
unit / control
module connector
Fig. 1 Fig. 2 Fig. 3
Fig. 4 Fig. 5

YH4
GRAND
VITARA
5E1-26 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
1. ABS hydraulic unit/
control module assembly
2. ABS hydraulic unit/
control module
connector of harness
1. ABS hydraulic
unit / control
module connector
DTC 41 (DTC C1041 / C1042) ± RIGHT-FRONT SOLENOID CIRCUIT
DTC 45 (DTC C1045 / C1046) ± LEFT-FRONT SOLENOID CIRCUIT
DTC 56 (DTC C1055 / C1056) ± REAR SOLENOID CIRCUIT
DESCRIPTION
The ABS control module monitors the voltage of the terminal of the solenoid circuit constantly with the ignition
switch turned ON. It sets this DTC when the terminal voltage does not become low / high for the ON / OFF command
to the solenoid or the voltage difference between solenoid circuit terminals exceeds the specified value with the
solenoid turned OFF.
INSPECTION
STEPACTIONYESNO
11) Check solenoid referring to item
ªABS HYDRAULIC UNIT OPERATION CHECKº
in this section.
Is it in good condition?Check terminals ªA11º
and ªA27º connection.
If connections OK,
substitute a known-
good ABS hydraulic
unit / control module
assembly and
recheck.Go to step 2.
21) Ignition switch OFF.
2) Disconnect ABS hydraulic unit / control module
connector. (See Fig. 1)
3) Check for proper connection to ABS hydraulic
unit / control module connector at terminal ªA11º.
4) If OK, then measure voltage between terminal
ªA11º of module connector and body ground.
Is it 10 ± 14 V?Substitute a known-
good ABS hydraulic
unit / control module
assembly and
recheck.ªW / Blº circuit open.
Fig. 1

YH4
GRAND
VITARA
ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL) 5E1-27
1. ABS hydraulic unit/
control module assembly
2. ABS hydraulic unit/
control module
connector
1. ABS hydraulic
unit / control
module connector
DTC 57 (DTC C1057) ± SOLENOID AND PUMP MOTOR POWER SOURCE
CIRCUIT
DESCRIPTION
The ABS control module monitors the voltage at terminal ( ªA11º and ªA27º) of the fail-safe and pump motor relays
circuit constantly with the ignition switch turned ON. When all solenoid circuit voltages are below the specified value
or the voltage at the terminal ªA27º became below the specified value while the pump motor is operating, this DTC
will be set. As soon as the voltage rises to the specified level, the set DTC will be cleared.
INSPECTION
STEPACTIONYESNO
1Check battery voltage. Is it about 11 V or higher?Go to step 2.Check charging
system referring
to ªCHARGING
SYSTEMº section.
2Check ABS main fuse and connection. Is it in good
condition?Go to step 3.Repair and / or
replace fuse.
31) Ignition switch OFF.
2) Disconnect ABS hydraulic unit / control module
connector. (See Fig. 1)
3) Check proper connection to ABS hydraulic unit /
control module connector at terminal ªA27º.
4) If OK, then measure voltage between connector
terminal ªA27º and body ground.
Is it 10 ± 14 V?Substitute a
known-good
ABS hydraulic
unit / control
module assembly
and recheck.ªW / Blº circuit open.
Fig. 1

YH4
GRAND
VITARA
5E1-28 ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL)
-1. ABS hydraulic unit /
control module assembly
1-1. ABS pump motor relay
1-2. ABS pump motor
1-3. ABS fail safe relay
-2. ABS hydraulic unit/
control module connector
of harness
1. ABS hydraulic
unit / control
module connector
DTC 61 (DTC C1061) ± ABS PUMP MOTOR CIRCUIT
DESCRIPTION
The ABS control module monitors the voltage at the monitor terminal of the pump motor circuit constantly with the
ignition switch turned ON. It sets this DTC when the voltage at the monitor terminal does not become high / low
according to ON / OFF commands to the motor relay of the module (does not follow these commands).
INSPECTION
STEPACTIONYESNO
11) Check pump motor referring to item
ªABS HYDRAULIC UNIT OPERATION
CHECKº in this section.
Is it in good condition?Check terminals ªA11º
and ªA27º connection.
If connections OK,
substitute a known-
good ABS hydraulic
unit / control module
assembly and recheck.Go to step 2.
21) Ignition switch OFF.
2) Disconnect ABS hydraulic unit / control
module connector. (See Fig. 1)
3) Check for proper connection to ABS
hydraulic unit / control module connector
at terminal ªA27º.
4) If OK, then measure voltage between
terminal ªA27º of module connector
and body ground.
Is it 10 ± 14 V?Go to step 3.ªW / Blº circuit open.
3Measure resistance between connector
terminal ªA28º of ABS hydraulic unit / control
module assembly.
Is it infinite (
)?ªBº circuit open.Substitute a known-
good ABS hydraulic
unit / control module
assembly and recheck.
Fig. 1

YH4
GRAND
VITARA
ANTILOCK BRAKE SYSTEM (ABS) (OPTIONAL) 5E1-29
1. Ignition switch
2. ABS hydraulic unit/
control module assembly
3. ABS hydraulic unit/
control module connector
of harness 2
1. ABS hydraulic
unit / control
module connector
DTC 63 (DTC C1063) ± ABS FAIL-SAFE RELAY CIRCUIT
DESCRIPTION
The ABS control module monitors the voltage at the terminal of the solenoid circuit constantly with the ignition
switch turned ON. Also, immediately after the ignition switch is turned ªONº, perform an initial check as follows.
Switch the fail-safe relay in the order of ON
OFF
ON and check if the voltage at 6 solenoid circuit terminals
changes to High
Low
High. If anything faulty is found in the initial check and when the voltage at all solenoid
circuit terminals is low with the ignition switch turned ON and ABS not operated, this DTC will be set.
INSPECTION
STEPACTIONYESNO
1Check battery voltage. Is it about 11 V or higher?Go to step 2.Check charging
system referring
to ªCHARGING
SYSTEMº section.
2Check ABS main fuse and connection. Is it in good
condition?Go to step 3.Repair and / or
replace fuse.
31) Ignition switch OFF.
2) Disconnect ABS hydraulic unit / control module
connector. (See Fig. 1)
3) Check proper connection to ABS hydraulic unit /
control module at terminal ªA11º.
4) If OK, then measure voltage between connector
terminal ªA11º, and body ground.
Is it 10 ± 14 V?Substitute a
known-good ABS
hydraulic unit /
control module
assembly and
recheck.ªW / Blº circuit open
or short to ground.
Fig. 1