Mercedes-Benz Sprinter / Dodge Sprinter. Service manual — part 100
3.3.4
HANDLING NO TROUBLE CODE
PROBLEMS
After reading Section 3.0 (System Description
and Functional Operation), you should have a bet-
ter understanding of the theory and operation of the
on-board diagnostics and how this relates to the
diagnosis of a vehicle that may have a driveability-
related symptom or complaint. When there are no
trouble codes present, refer to the no trouble code
(*) tests.
3.4
USING THE DRBIII
T
Refer to the DRBIII
t user’s guide for instructions
and assistance with reading the DTCs, erasing the
DTCs, lab scope usage and other DRBIII
t func-
tions.
3.4.1
DRBIII
T DOES NOT POWER UP
If the LEDs 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 at data link
connector cavity 16. A minimum of 11.0 volts is
required to adequately power the DRBIII
t. Check
for proper ground connection at data link connector
cavities 4 and 5.
If all connections are proper between the
DRBIII
t and the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIII
t may be the result of a faulty cable or
vehicle wiring. For a blank screen, refer to the
appropriate diagnostic manual.
3.4.2
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 latest
information 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: HIGH-PRESSURE FUEL LINES
DELIVER DIESEL FUEL UNDER EXTREME
PRESSURE FROM THE INJECTION PUMP TO
THE FUEL INJECTORS. THIS MAY BE AS
HIGH AS
23,200
PSI
(1600
BAR).
USE
EXTREME
CAUTION
WHEN
INSPECTING
FOR HIGH-PRESSURE FUEL LEAKS. FUEL
UNDER THIS AMOUNT OF PRESSURE CAN
PENETRATE
SKIN
CAUSING
PERSONAL
INJURY
OR
DEATH.
INSPECT
FOR
HIGH-PRESSURE
FUEL
LEAKS
WITH
A
SHEET OF CARDBOARD. WEAR SAFETY
GOGGLES AND ADEQUATE PROTECTIVE
CLOTHING
WHEN
SERVICING
FUEL
SYSTEM.
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 AREA 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 drive
wheels.
When servicing a vehicle, always wear eye pro-
tection and remove any metal jewelry such as
watchbands or bracelets that might make electrical
contact.
When diagnosing powertrain system problems, it
is important to follow approved procedures where
applicable. These procedures can be found in the
8
GENERAL INFORMATION
service manual. Following these procedures is very
important to the safety of the individuals perform-
ing the 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 powertrain system are
intended to be serviced as an assembly only. At-
tempting to remove or repair certain system 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.
4.2.4
DRBIII
T SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIII
T
MULTIMETER IS DANGEROUS. IT
CAN
EXPOSE
YOU
TO
SERIOUS
OR
POSSIBLE
FATAL
INJURY.
CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND SPECIFICATION LIMITS.
Follow the vehicle manufacturer’s service specifi-
cations at all times.
– Do not use the DRBIII
t if it has been dam-
aged.
– Do not use the test leads if the insulation is
damaged or if metal is exposed.
– To avoid electrical shock, do not touch the test
leads, tip or the circuit being tested.
– Choose the proper range and function for the
measurement. Do not try voltage or current
measurements that may exceed the rated ca-
pacity.
– Do not exceed the limits shown in the table
below:
FUNCTION
INPUT LIMIT
Volts
0–500 peak volts AC
0–500 volts DC
Ohms (Resistance)*
0–1.12 megaohms
Frequency Measure
Frequency Generated
0–10 kHz
Temperature
–58 – +1100°F
–50 – +600°C
* Ohms cannot be measured if voltage is present.
Ohms can be measured only on a non-powered
circuit.
– Voltage between any terminal and ground
must not exceed 500v DC or 500v peak AC.
– Use caution when measuring voltage above
25v DC or 25v AC.
– The circuit being tested must be protected by a
10 amp fuse or circuit breaker.
– Use the low current shunt to measure circuits
up to 10 amps. Use the high current shunt to
measure circuits exceeding 10 amps.
– When testing for the presence of voltage or
current, make sure the meter is functioning
correctly. Take a reading of a known voltage or
current before accepting a zero reading.
– When measuring current, connect the meter in
series with the load.
– Disconnect the live test lead before disconnect-
ing the common test lead.
4.3
WARNINGS AND CAUTIONS
4.3.1
ROAD TEST WARNINGS
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
CAUTION: Before road testing a vehicle, be
sure that all components are reassembled.
During the test drive, do not hang the DRBIII
T
from the rear view mirror. Do not attempt to
read the DRBIII
T
while driving. Have an
assistant available to operate the DRBIII
T
.
4.3.2
VEHICLE DAMAGE CAUTIONS
Before disconnecting any control module, make
sure the ignition is off. Failure to do so could
damage the module. When testing voltage or circuit
integrity at any control module, use the terminal
side (not the wire end) of the harness connector. Do
not probe through the insulation; this will damage
it and eventually cause it to fail because of corro-
sion.
Be careful when performing electrical test so as to
prevent accidental shorting of terminals. Such a
mistake can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
5.0
REQUIRED TOOLS AND
EQUIPMENT
DRBIII
t (diagnostic read-out box) scan tool
vacuum gauge
ammeter
9
GENERAL INFORMATION
ohmmeter
voltmeter
jumper wires and probes
oscilloscope
6.0
GLOSSARY OF TERMS
A/C
air conditioning
APP
accelerator pedal position (sensor)
BCM
body control module
BP
boost pressure (sensor)
CKP
crankshaft position (sensor)
CMP
camshaft position (sensor)
CTM
central timer module
DLC
data link connector
ECM
engine control module
ECT
engine coolant temperature (sensor)
EGR
exhaust gas recirculation (solenoid/
valve)
EOS
engine oil sensor
IAT
intake air temperature (sensor)
IP
intake pressure sensor
MAF
mass air flow (sensor)
MIL
malfunction indicator lamp
ms
millisecond(s)
O2
oxygen sensor
PDC
power distribution center
S/C
speed control
SKREEM
sentry key remote entry module
SRC
signal range check
WIF
water in fuel (sensor)
10
GENERAL INFORMATION
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
11
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