engine MERCEDES-BENZ SPRINTER 2006 Workshop Manual

ENGINE CONTROL MODULE C2 (OBD)CAV CIRCUIT FUNCTION
1 16BK/RD FUSED ENGINE CONTROL RELAY OUTPUT
2 14BR GROUND
3 14BK/BL FUSED ENGINE CONTROL RELAY OUTPUT
4 14BR GROUND
5 14BK/BL FUSED ENGINE CONTROL RELAY OUTPUT
6 14BR GROUND
7 18RD S/C SWITCH 12 VOLT SUPPLY
8 18BR/WT HIGH IDLE ON SIGNAL
10 18WT/RD BOOST PRESSURE SENSOR 5 VOLT SUPPLY
11 18WT/DG BOOST PRESSURE SENSOR SIGNAL
12 18BR/WT SENSOR GROUND
13 18GY/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 2
14 18BR/GY ACCEL PEDAL POSITION SENSOR GROUND NO. 2
17 18BR/DG KICKDOWN SWITCH SIGNAL
18 20DG/YL ENGINE RPM
19 18BK FUSED IGNITION SWITCH OUTPUT (RUN-START)
24 18BL/RD ACCEL PEDAL POSITION SENSOR 5 VOLT SUPPLY
25 18BL/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 1
26 18BR/BL ACCEL PEDAL POSITION SENSOR GROUND NO. 1
28 18BR/DG INTAKE AIR TEMPERATURE SENSOR GROUND
31 20BL/YL K-ECM
32 20DG ENHANCED ACCIDENT REPORT DRIVER
36 18VT IGNITION SWITCH OUTPUT (START)
37 18DG ACCEL/SET SIGNAL
38 18BK VERIFICATION SIGNAL
42 18DG/WT INTAKE AIR TEMPERATURE SENSOR SIGNAL
43 18BK/RD GLOW PLUG MODULE CONTROL
44 18YL/BL ENGINE CONTROL RELAY CONTROL
50 18YL DECEL/SET SIGNAL
51 18GY OFF SIGNAL
52 18BL RESUME SIGNAL
53 20DG/WT CAN C BUS (+)
54 20DG CAN C BUS (-)
55 18BR/RD FUEL PUMP RELAY CONTROL
58 18VT/DG STARTER MOTOR RELAY CONTROL
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ENGINE CONTROL MODULE C3 (EXCEPT OBD) - BLACKCAV CIRCUIT FUNCTION
1 18BR/DG INTAKE AIR TEMPERATURE SENSOR GROUND
2- -
3- -
4- -
5 18BL/RD ACCEL PEDAL POSITION SENSOR 5 VOLT SUPPLY
6 18WT/DG BOOST PRESSURE SENSOR SIGNAL
7 20BR/YL MASS AIR FLOW SENSOR GROUND
8 18BR/GY ACCEL PEDAL POSITION SENSOR GROUND NO. 2
9 18GY/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 2
10 18BL/DG ACCEL PEDAL POSITION SENSOR SIGNAL NO. 1
11 - -
12 18DG/WT INTAKE AIR TEMPERATURE SENSOR SIGNAL
13 - -
14 - -
15 - -
16 - -
17 18WT/RD BOOST PRESSURE SENSOR 5 VOLT SUPPLY
18 20YL/DG MASS AIR FLOW SENSOR SIGNAL
19 20BR/BK MASS AIR FLOW SENSOR 5 VOLT SUPPLY
20 18VT IGNITION SWITCH OUTPUT (START)
21 - -
22 18BR/WT BOOST PRESSURE SENSOR GROUND
23 18BR/BL ACCEL PEDAL POSITION SENSOR GROUND NO. 1
24 - -
25 18BK/RD GLOW PLUG MODULE CONTROL
26 - -
27 - -
28 20BL/YL K-ECM
29 - -
30 18RD/BL STARTER MOTOR RELAY 12 VOLT SUPPLY
31 - -
32 - -
33 20YL/RD MASS AIR FLOW SENSOR 12 VOLT SUPPLY
34 - -
35 20BR BOOST PRESSURE SOLENOID 12 VOLT SUPPLY
36 - -
37 - -
38 - -
39 - -
40 20DG/YL ENGINE RPM
41 - -
42 - -
43 18VT/DG STARTER MOTOR RELAY CONTROL
44 - -
45 - -
46 18YL/BL ENGINE CONTROL RELAY CONTROL
47 - -
48 20WT BOOST PRESSURE SOLENOID CONTROL
49 - -
50 - -
51 - -
52 - -
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FUSES (FUSE BLOCK NO. 1)FUSE
NO.AMPS FUSED CIRCUIT FUNCTION
1- - -
2 10A 16WT FUSED HIGH BEAM SWITCH OUTPUT
3 10A 16WT FUSED HIGH BEAM SWITCH OUTPUT
4 10A 16WT/BL/RD FUSED IGNITION SWITCH OUTPUT (RUN-START)
5 10A 16BK/BL/WT FUSED IGNITION SWITCH OUTPUT (RUN-START)
6 20A INTERNAL FUSED IGNITION SWITCH OUTPUT (RUN-START)
7 15A 16BK/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
8 20A 16RD/YL FUSED B(+)
9 15A INTERNAL FUSED B(+)
10 10A 16GY/DG/RD HEADLAMP SWITCH OUTPUT
11 10A 16GY/BK FUSED LEFT LAMP RELAY OUTPUT
12 10A 18YL HEADLAMP SWITCH OUTPUT
13 10A 18YL HEADLAMP SWITCH OUTPUT
14 15A 16BK/YL/WT FOG LAMP RELAY SIGNAL
15 10A 16BK/RD FUSED IGNITION SWITCH OUTPUT (ACC-RUN-START)
16 15A 12BK/BL ENGINE CONTROL RELAY OUTPUT
17 15A 16BK/RD ENGINE CONTROL RELAY OUTPUT
18 15A 14BK FUSED IGNITION SWITCH OUTPUT (RUN-START)
19 15A 14RD/BK (OBD) FUSED B(+)
20 15A 16RD/BL FUSED B(+)
21 30A 12RD FUSED B(+)
FUSE BLOCK NO. 1 C1CAV CIRCUIT FUNCTION
1 INTERNAL FOG LAMP SWITCH OUTPUT
3 INTERNAL HIGH BEAM SWITCH OUTPUT
4 16RD/BL FUSED RIGHT LAMP RELAY OUTPUT
5 INTERNAL HIGH BEAM SELECT
6 INTERNAL FUSED LEFT RELAY OUTPUT
8 INTERNAL LAMP DRIVER
9 INTERNAL FUSED IGNITION SWITCH OUTPUT (RUN-START)
10 INTERNAL FUSED B(+)
11 INTERNAL TURN SIGNAL RELAY OUTPUT
14 INTERNAL GROUND
15 INTERNAL WIPER SWITCH OUTPUT
16 INTERNAL WIPER SWITCH OUTPUT
18 INTERNAL FUSED IGNITION SWITCH OUTPUT (RUN-START)
19 INTERNAL 12 VOLT SUPPLY
21 INTERNAL WIPER ON/OFF SWITCH OUTPUT
22 INTERNAL FUSED B(+)
FUSE BLOCK NO. 1 C2CAV CIRCUIT FUNCTION
1 14BK/RD FUSED IGNITION SWITCH OUTPUT (RUN)
2 14BK/YL FUSED IGNITION SWITCH OUTPUT (START)
3 16GY/DG FUSED IGNITION SWITCH OUTPUT (ACC OFF)
4 14BK FUSED IGNITION SWITCH OUTPUT (RUN-START)
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FUSE BLOCK NO. 1 C3 - BLACKCAV CIRCUIT FUNCTION
1- -
2 16BK/VT FUSED IGNITION SWITCH OUTPUT (RUN-START)
3 12VT IGNITION SWITCH OUTPUT (START)
4- -
5 12RD FUSED B(+)
FUSE BLOCK NO. 1 C4 - BLACKCAV CIRCUIT FUNCTION
1 16RD/BL FUSED B(+)
2 14RD/BK (OBD) FUSED B(+)
3- -
4 16BK/RD ENGINE CONTROL RELAY OUTPUT
5 16WT FUSED HIGH BEAM SWITCH OUTPUT
6- -
7 16BK/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
8 16BK/YL/WT FOG LAMP RELAY SIGNAL
9- -
10 16WT FUSED HIGH BEAM SWITCH OUTPUT
11 16RD/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
12 16BR/BK WIPER MOTOR CONTROL
13 - -
14 16WT/BL/RD FUSED IGNITION SWITCH OUTPUT (RUN-START)
15 - -
FUSE BLOCK NO. 1 C5 - BLACKCAV CIRCUIT FUNCTION
1 16BK/BL/WT FUSED IGNITION SWITCH (RUN-START)
2 12BK/BL FUSED ENGINE CONTROL RELAY OUTPUT
3 18YL FUSED HEADLAMP SWITCH OUTPUT
4 16GY/BK LEFT LAMP RELAY OUTPUT
5 16BK/DG RIGHT TURN SIGNAL
6 16GY/RD RIGHT LAMP RELAY OUTPUT
7 16GY/DG LAMP DRIVER
8 16BK/WT LEFT TURN SIGNAL
9- -
10 - -
11 - -
12 - -
13 16YL FUSED HEADLAMP SWITCH OUTPUT
14 16BK/VT/RD WASHER ON/OFF SWITCH OUTPUT
15 18YL/BL ENGINE CONTROL RELAY SIGNAL
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INSTRUMENT CLUSTER C1CAV CIRCUIT FUNCTION
1 20BR FUEL LEVEL SENSOR SIGNAL RETURN
2 20BR/DG AMBIENT TEMPERATURE SENSOR SIGNAL RETURN
4 20WT/GY K-IC/ATC/HBM/CHM
5 20BR/BK PARK BRAKE INDICATOR SIGNAL
7 20BK/DG RIGHT TURN SIGNAL
10 20BL/BK FUEL LEVEL SENSOR SIGNAL (+)
11 20BL/DG AMBIENT TEMPERATURE SENSOR SIGNAL (+)
14 20DG/WT/BL ENGINE COOLANT LEVEL SWITCH SIGNAL
15 20BR/WT FRONT COURTESY LAMPS CONTROL
16 20YL/RD SEAT BELT SWITCH SIGNAL
17 20DG CAN C BUS (-)
18 20DG/WT CAN C BUS (+)
INSTRUMENT CLUSTER C2 - WHITECAV CIRCUIT FUNCTION
1- -
2- -
3 20RD/YL FUSED B(+)
4 20BR/WT BRAKE WEAR SENSOR SIGNAL
5- -
6 18BR GROUND
7 20GY/DG/RD LAMP DRIVER
8 20BL/WT FUSED HIGH BEAM SWITCH OUTPUT
9 20BL/RD/WT VEHICLE SPEED SENSOR OUTPUT
10 20BK FUSED IGNITION SWITCH OUTPUT (RUN-START)
11 20BL/BK KEY-IN IGNITION SWITCH SIGNAL
12 - -
13 20BK/WT LEFT TURN SIGNAL
14 20BR/YL BRAKE FLUID LEVEL INDICATOR SIGNAL
15 20BL GENERATOR FIELD DRIVER
16 20YL AIRBAG WARNING INDICATOR DRIVER
17 - -
18 20BL/VT D(+) RELAY NO. 1 CONTROL
18 20BL/VT D(+) RELAY NO. 1 CONTROL
INTRUSION SENSOR NO. 1 - BLACKCAV CIRCUIT FUNCTION
1 20BR GROUND
2 20DG/BK INTRUSION SENSOR 1 SIGNAL
3 20DG/YL INTRUSION SENSOR INTERFACE
4 20RD/DG FUSED B(+)
INTRUSION SENSOR NO. 2 - BLACKCAV CIRCUIT FUNCTION
1 20BR GROUND
2 20GY/BK INTRUSION SENSOR 2 SIGNAL
3 20DG/YL INTRUSION SENSOR INTERFACE
4 20RD/DG FUSED B(+)
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DIAGNOSTIC TEST PROCEDURES — TELL US!
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enable the HCU to perform the brake fluid manage-
ment control as the combination/proportioning
valves.
The Bosch 5.7 system uses the CAB/HCU/Pump
Motor to make an integral electronic/hydraulic unit
which shares data with other electronic modules on
the vehicle via the CAN C Bus network. To access
DTCs from the CAB, the DRBIIItuses the K-ABS
line located in the Data Link Connector (DLC).
3.3 BRAKE ASSIST SYSTEM (HBA)
The Brake Assist System (HBA) analyzes how
hard and fast the driver wants to brake. It monitors
the brake pressure via a pressure sensor. The
passenger car brake assist system uses a vacuum
booster solenoid. The Sprinter uses the hydraulic
control unit to develop the brake pressure.
3.4 TCS (ASR)
The primary function of the Traction Control System
is to reduce wheel slip and maintain traction at the
driven wheels when the road surfaces are slippery. The
Traction Control System reduces wheel slip by applying
the brake that has lost traction. The system is designed
to operate at speeds below 50 km/h (30 mph). The
engine's torque can be reduced by the ECM via the CAN
C Bus, if necessary. The TCS can be deactivated with
switch on the dash. The Traction Control System uses
the ABS to indicate spinning tires to enable the traction
control function. The TCS software is in the CAB.
The TCS (ASR) performs the following functions:
1. Engine power derate
2. Engine deceleration regulation. If the vehicle is
on a patch of ice, the simple action of releasing
the throttle is enough to cause the rear wheels to
slip. To avoid this, the throttle input is regulated
so power drops slowly instead of abruptly. The
engine power is reduced (decelerated) as neces-
sary.
3.5 ELECTRONIC BRAKE DISTRIBUTION
(EBD)
The system was enhanced and eliminates the
need for the ALB system (load sensing valve). All
ESP equipped models will not have ALB. The EBV
system self-adapts to operating conditions. It de-
tects the vehicle's payload when the vehicle starts
and pulls away. Based on the acceleration rate
when the vehicle first pulls away from a standstill,
the system is able to calculate the actual payload.
This is a rough estimate which is used initially.
Later on, the system gathers more precise informa-
tion by monitoring the brake pressure and wheel
speed and negative slip when the driver applies thebrakes. The system will then produce a more accu-
rate calculation of payload depending on brake
retardation. The adaptation is erased when the
ignition is switched off. A new adaptation will occur
on the next driving cycle. By default, the system
acts upon the vehicle as if in an unloaded condition
(safe mode).
Once a new driving cycle begins with the vehicle
in a fully loaded condition (without having gathered
more precise information) the system will detect
ABS actuation in the front wheels and will allow
enough pressure to be applied to the rear axle, to an
extent where the wheels are just about to lock up
(maximum braking possible).
The system calculates the braking force at the
front and rear axles. If the driver applies the brakes
gently and then realizes he needs to apply the
brakes further, the EBV allows the proper pressure
to be applied to the front and rear brakes.
The EBV also contains a feature called ªcorner
brake systemº (CBS) which operates when the ve-
hicle is braked while cornering to avoid a possible
oversteering condition. The EBV monitors the
wheel speed of both rear wheels to detect when the
vehicle is cornering and allows precise brake pres-
sure application to the front and rear brakes. Also
when the brakes are applied during cornering, the
outer wheels get more of the vehicle's weight while
the inner wheels get less weight and could lose
traction (wheel lock up). The EBV system splits the
pressure between left and right sides in addition to
front and rear brakes.
3.6 VEHICLE CONTROLLING (FZR)
Vehicle controlling (FZR)requires additional
sensors to operate. The term ESP refers to the
software of the system. The term FZR refers to the
system controller. The TCS (ASR) system requires
wheel speed sensors to monitor wheel slip and CAN
bus communications to regulate engine power. In
addition to these inputs, the vehicle controlling
(FZR) requires a steering angle sensor, and a lateral
acceleration/yaw rate sensor.
The ESP system does not take the vehicle load
into account. Instead, the coefficient of friction is
calculated in a 20 millisecond period, where the
controller measures the rate at which the wheel
speed is decelerated, as brake pressure is applied to
the wheel.
3.7 SYSTEM COMPONENTS
²Controller Antilock Brake (CAB)
²Hydraulic Control Unit (HCU)
²Pump Motor
2
GENERAL INFORMATION

²Four Wheel Speed Sensors/Tone Wheel assem-
blies
²ABS warning indicator
²TCS (ASR) event indicator
²TCS (ASR) warning indicator
²Steering Angle Sensor
²Lateral Acceleration/Yaw Rate Sensor
²Brake Pressure Sensor
²ESP event indicator
²Brake Fluid Level switch
²Brake Switch (BS)
²Brake Lamp Switch (BLS)
²TCS Switch (TCSS)
²K - ABS
²CAN C Bus
²Fuses, grounds, and wiring
3.7.1 ABS AND TCS (ASR) INDICATORS
This system is equipped with an ABS warning
indicator, TCS (ASR) warning indicator, and TCS
(ASR) event indicator to alert the driver of a
malfunction/event it has detected. The CAB can
request the illumination of the ABS warning indi-
cator, TCS (ASR) warning indicator, and TCS (ASR)
event indicator via CAN C BUS. The CAB controls
the ABS warning indicator by:
²Light steady during an initial test at the begin-
ning of an ignition cycle to function as a bulb
check
²Light steady when a system malfunction exists
(DTC)
²Light steady - If you have not met the speed
required to reset/retest the ABS components
The Instrument Cluster (IC) controls the indica-
tors. The Instrument Cluster transmits a message
over the CAN C Bus relating to diagnostics and
current lamp status for the ABS and TCS (ASR)
indicators. The CAB can control the operation of
TCS warning and TCS event indicators by:
²Both light steady with engine off and both go out
with engine running
²TCS warning indicator lights steady when a TCS
malfunction exists
²TCS event indicator will flash when TCS is in an
active event
3.7.2 CONTROLLER ANTILOCK BRAKE
(CAB)
The CAB is mounted directly to the Hydraulic
Control Unit (HCU) that includes a microprocessor
and twelve solenoids that control valves that con-trol brake pressure during antilock braking or trac-
tion control events. The CAB also has circuits that
monitor the following:
²Double brake switch outputs are monitored to
determine whether or not to prepare for possible
ABS braking
²Wheel Speed Sensors are monitored to determine
when a wheel is tending to lock up. The CAB will
operate the valves in the HCU to control braking
pressure during ABS braking
²Detect ABS system related problems and take
diagnostic action
²Able to execute self-tests and output control com-
mands
When equipped with Electronic Stability (ESP),
the CAB also monitors the following:
²The ESP looks at the Steering Angle Sensor value
and monitors the speed of the inner and outer
wheels to ensure that the values are plausible.
The Steering Angle Sensor also monitors the
speed that the steering wheel is turned.
²The Lateral Acceleration/Yaw Rate Sensor is con-
tained in one unit. The sensor measures side to
side (lateral) motion and rotational motion (how
fast the vehicle is turning).
²The ESP uses data from the Brake Pressure
Sensor to analyze how hard and fast that the
driver wants to brake.
3.7.3 HYDRAULIC CONTROL UNIT (HCU)
The HCU on the Bosch 5.7 has an integral valve
body for controlling the front and rear brakes.
Within the HCU are inlet, outlet, and shuttle
valves, to release brake pressure as required to
avoid wheel lockup, keeping the wheels rolling, and
maintain optimum deceleration with stability. The
Pump Motor is attached to the HCU which works
with the ABS and TCS and is controlled by the
CAB. The primary function is to provide extra
amount of fluid when needed.
3.7.4 SWITCHES/SENSORS
BRAKE SWITCH (BS):This switch prepares the
CAB for a possible antilock event. The CAB uses an
output state voltage from the BS when the brake
pedal is either released/depressed. The Fused Igni-
tion Switch Output circuit supplies 12 volts to the
BS. A released brake pedal will close the BS circuit
and the BS Output circuit supplies 12 volts to the
CAB. When the driver depresses the brake pedal,
the BS Output circuit voltage drops to 0 volts and
the CAB senses the brake pedal state. This tells the
CAB what position the brake pedal is currently in to
make an ABS event possible. When using the
DRBIIItin Inputs/Outputs, the BS and BLS will
3
GENERAL INFORMATION

ver: 2.14
date: 26 Jul93
file: key_iff.cc
date: Jul 26 1993
line: 548
err: 0x1
User-Requested COLD Boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
3.9.1 DRBIIITDOES NOT POWER UP
(BLANK SCREEN)
If the LED's do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
16-way connector cavity 16). A minimum of 11 volts
is required to adequately power the DRBIIIt. Also
check for a good ground at DLC.
If all connections are proper between the
DRBIIItand the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIIItmay be the result or a faulty cable or
vehicle wiring.
3.9.2 DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
4.0 DISCLAIMERS, SAFETY,
WARNINGS
4.1 DISCLAIMERS
All information, illustrations, and specifications
contained in this manual are based on the latestinformation available at the time of publication.
The right is reserved to make changes at any time
without notice.
4.2 SAFETY
4.2.1 TECHNICIAN SAFETY INFORMATION
WARNING: ENGINES PRODUCE CARBON
MONOXIDE THAT IS ODORLESS, CAUSES
SLOWER REACTION TIME, AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE IS
OPERATING, KEEP SERVICE AREAS WELL
VENTILATED OR ATTACH THE VEHICLE
EXHAUST SYSTEM TO THE SHOP EXHAUST
REMOVAL SYSTEM.
Set the parking brake and block the wheels before
testing or repairing the vehicle. It is especially
important to block the wheels on front-wheel drive
vehicles; the parking brake does not hold the front
drive wheels.
When servicing a vehicle, always wear eye pro-
tection, and remove any metal jewelry such as
watchbands or bracelets that might make an inad-
vertent electrical contact.
When diagnosing an antilock brake or adjustable
pedals system problem, it is important to follow
approved procedures where applicable. These pro-
cedures can be found in the service manual. Follow-
ing these procedures is very important to safety of
individuals performing diagnostic tests.
4.2.2 VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If it does not, false diagnostic codes
or error messages may occur.
4.2.3 SERVICING SUB-ASSEMBLIES
Some components of the antilock brake and trac-
tion control are intended to be serviced in assembly
only. Attempting to remove or repair certain sub-
components may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
5
GENERAL INFORMATION

Symptom:
CAN COMMUNICATION ERROR
POSSIBLE CAUSES
CAN DTCS PRESENT IN OTHER MODULES
INTERMITTENT CAN COMMUNICATION ERROR DTC
DAMAGED CAB/CAB HARNESS CONNECTOR
CAN CIRCUIT(S) SHORT TO VOLTAGE
CAN CIRCUIT(S) SHORTED TOGETHER
CAN CIRCUIT(S) SHORT TO GROUND
CAN CIRCUIT(S) OPEN
FUSED OPTIONAL EQUIPMENT RELAY OUTPUT CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
ANTI-LOCK BRAKE CONTROLLER
TEST ACTION APPLICABILITY
1 Turn the ignition on.
NOTE: Diagnose any Steering Angle Sensor DTCs that are present in this
module before continuing.
With the DRBIIIt, read DTCs in the Engine Control Module, Transmission Control
Module, and Instrument Cluster.
Are there any CAN communication DTCs present in any of these modules?All
Ye s!Refer to the diagnostic procedures for any CAN DTCs in ECM,
TCM and Cluster before proceeding with this test.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 2
2NOTE: If a system undervoltage or overvoltage DTC is set along with this
DTC, diagnose the system voltage DTC first.
Turn the ignition on.
With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
With the DRBIIIt, read DTCs.
Does this DTC reset?All
Ye s!Go To 3
No!Go To 11
3 Turn the ignition off.
Disconnect the CAB harness connector.
Inspect the CAB/CAB harness connector for damage.
Is there any broken, bent, pushed out, corroded or spread terminals?All
Ye s!Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No!Go To 4
25
BRAKES (CAB)