Frelander 2. Manual — part 125
Anti-Lock Control -
General Specification
Item
Specification
System make / type
Continental Teves - MK23E1
Wheel speed sensors:
Make
Continental Teves
Yaw rate sensor:
Make / type
Continental Teves - RSC03
Location
Center console in front of gear shift
Torque Specifications
Description
Nm
lb-ft
ABS module to mounting bracket nuts
10
7
Accelerometer bolts
6
5
Brake fluid tube unions
15
11
Front road wheel speed sensor to wheel knuckle bolt
5
4
Rear road wheel speed sensor to wheel knuckle bolt
5
4
Anti-Lock Control - Anti-Lock Control
Description and Operation
OVERVIEW
The anti-lock control section is incorporated within the anti-lock control - stability assist section of the workshop manual.
For additional information, refer to:
Anti-Lock Control - Stability Assist
(206-09C Anti-Lock Control - Stability Assist,
Description and Operation).
1
2
Anti-Lock Control - Anti-Lock Control
Diagnosis and Testing
Principles of Operation
For a detailed description of the Anti-lock Braking System (ABS), refer to the relevant Description and Operation section in
the workshop manual. REFER to:
Anti-Lock Control - Stability Assist
(206-09C Anti-Lock Control - Stability Assist,
Description and Operation).
Inspection and Verification
CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does
not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor
vehicle.
• NOTE: Prior to any testing or inspection, the vehicle should be check for any relevant warning lamps being illuminated. If
a warning lamp is illuminated, check for DTCs and refer to the relevant DTC Index, if no warning lamp is illuminated,
continue with diagnostic procedures below.
1. Verify the customer concern.
1.
2. Visually inspect for obvious signs of damage and system integrity.
Visual Inspection
Mechanical
Electrical
Brake fluid level
Vacuum system
W heel speed sensor installation
W heel speed sensor air gap
Steering wheel rotation sensor
Accelerometer/sensor cluster installation
Incorrect wheel or tire size
W arning light operation
Fuses
W heel speed sensors
Connectors/Pins
Harnesses
Steering wheel rotation sensor
Accelerometer/sensor cluster
Hydraulic Control Unit (HCU)
2.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before
proceeding to the next step
3.
4. If the cause is not visually evident, check the anti-lock braking system and steering rotation sensor modules for
Diagnostic Trouble Codes (DTCs) and refer to the relevant DTC Index.
4.
DTC Index
• NOTE: If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the
Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior
to the installation of a new module/component.
• NOTE: Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the
scan tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give additional
information read by the manufacturer approved diagnostic system).
• NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal
places, and with an up-to-date calibration certificate. W hen testing resistance always take the resistance of the DMM
leads into account.
• NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.
• NOTE: Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.
• NOTE: If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may
be the cause. Always check for loose connections and corroded terminals.
For a complete list of all Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section
100-00.REFER to:
Diagnostic Trouble Code (DTC) Index - DTC: Anti-Lock Braking System (ABS)
(100-00 General
Information, Description and Operation).
Pinpoint Tests
PINPOINT TEST A : BRAKE VACUUM ASSIST FUNCTION
TEST
CONDITIONS
DETAILS/RESULTS/ACTIONS
A1: CHECK THE BRAKE PEDAL TRAVEL WITH THE ENGINE OFF
Set ignition switch to OFF.
Pump the brake pedal six times and hold firm pressure on the pedal.
Did the pedal travel decrease and the pedal go hard as it was pumped?
Yes
GO to A2
.
No
CHECK the vacuum circuit to the brake booster. Start the engine and idle for three minutes, switch
ignition OFF then repeat the test. If the pedal travel does not decrease, suspect the brake booster.
A2: CHECK THE BRAKE PEDAL TRAVEL WITH THE ENGINE RUNNING
1
With firm pressure still held on the brake pedal, start the engine.
Did the pedal travel increase as the engine started?
Yes
The vacuum function of the brake booster is operating normally. Check for DTCs indicating a fault
elsewhere in the system.
No
CHECK the vacuum circuit to the brake booster.
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