Dodge Dakota (R1). Manual - part 820

SYMPTOM

DIAGNOSTIC TEST

CUTS OUT/MISSES

CHECKING PCM POWER AND GNT CKT
CHECKING THE FUEL PRESSURE
CHECKING THE MINIMUM IDLE AIR FLOW
CHECKING IDLE AIR CONTROL MOTOR OPERATION

BACKFIRE/POPBACK

CHECKING PCM POWER AND GND CKT
CHECKING THE FUEL PRESSURE
CHECKING MAP SENSOR CALIBRATION
CHECKING THE MINIMUM IDLE AIR FLOW

RUNS ROUGH/UNSTABLE/
ERRATIC IDLE

CHECKING PCM POWER AND GND CKT
CHECKING THE FUEL PRESSURE
CHECKING COOLANT SENSOR CALIBRATION
CHECKING THROTTLE POSITION SENSOR CALIBRATION
CHECKING MAP SENSOR CALIBRATION
CHECKING THE MINIMUM IDLE AIR FLOW
CHECKING IDLE AIR CONTROL MOTOR OPERATION
CHECKING EVAP EMISSION SYSTEM
CHECKING IAT SENSOR

POOR FUEL ECONOMY

3.3.5

NO START INFORMATION

IMPORTANT NOTE:

If the Powertrain Control Module has been

changed and the correct VIN and mileage have not
been programmed, a DTC will be set in the ABS and
Air bag modules. In addition, if the vehicle is
equipped with a Sentry Key Immobilizer Module
(SKIM), Secret Key data must be updated to enable
starting.

FOR ABS AND AIR BAG SYSTEMS:

1. Enter correct VIN and Mileage in PCM.

2. Erase codes in ABS and Air Bag modules.

FOR SKIM THEFT ALARM:

1. Connect the DRBIII

t to the data link connector.

2. Go to Theft Alarm, SKIM, Misc. and place the

SKIM in secured access mode, by using the
appropriate PIN code for this vehicle.

3. Select Update the Secret Key data, data will be

transferred from the SKIM to the PCM (This is
required to allow the vehicle to start with the
new PCM).

4. If three attempts are made to enter secured

access mode using the incorrect PIN, secured
access mode will be locked out for one hour. To
exit this lock out mode, leave the ignition key in
the Run/Start position for one hour. Ensure all
accessories are turned off. Also monitor the bat-
tery state and connect a battery charger if nec-
essary.

3.4

USING THE DRBIII

Refer to the DRBIII

t user’s guide for instructions

and assistance with reading trouble codes, erasing
trouble codes, and other DRBIII

t functions

GENERAL INFORMATION

3.5

DRBIII

T ERROR MESSAGES AND

BLANK SCREEN

Under normal operation, the DRBIII

t will dis-

play one of only two error messages:

– User-Requested WARM Boot BY PRESSING

MORE AND NO AT THE SAME TIME.

ver: 2.29
date: 1 Oct 93
file: key_itf.cc
date: Jan 12 1994
line: 544
err: 0x1
User-Requested WARM Boot

Press MORE to switch between this display

and the application screen.

Press F4 when done noting information.

– User-Requested COLD Boot BY PRESSING

MORE AND YES AT THE SAME TIME.

ver: 2.29
date: 1 Oct 99
file: key_hnd1.cc
date: Mar 8 2000
line: 1297
err: 0x1
User-Requested COLD Boot

Press MORE to switch between this display

and the application screen.

Press F4 when done noting information.

If the DRBIII

t should display any other error

message, record the entire display and call the
STAR Center.

3.5.1

DRBIII

T DOES NOT POWER UP

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
connector cavity 16). Check for proper ground con-
nection at DLC cavity 4. A minimum of 11 volts is
required to adequately power the DRBIII

If all connections are proper between the

DRBIII

t and the vehicle or other devices, and the

vehicle battery is fully charged, and inoperative
DRBIII

t may be the result of faulty cable or vehicle

wiring. For a blank screen, refer to the appropriate
body diagnostics manual.

3.5.2

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: 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 an inad-
vertent electrical contact.

When diagnosing a powertrain system problem,

it is important to follow approved procedures where
applicable. These procedures can be found in ser-
vice manual procedures. Following these proce-
dures is very important to the safety of individuals
performing diagnostic tests.

GENERAL INFORMATION

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 in assembly only. Attempt-
ing 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
DRB MULTIMETER IS DANGEROUS. IT CAN
EXPOSE

YOU

SERIOUS

INJURY.

CAREFULLY READ AND UNDERSTAND THE
CAUTIONS

AND

THE

SPECIFICATION

LIMITS.

Follow the vehicle manufacturer’s service specifi-

cations at all times.

•

Do not use the DRBIII

t if it has been damaged.

•

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, tips, or the circuit being tested.

•

Choose the proper range and function for the
measurement. Do not try voltage or current mea-
surements that may exceed the rated capacity.

•

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 megohms

Frequency Measured
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 in 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
10A fuse or circuit breaker.

•

Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.

•

When testing for the presence of voltage or cur-
rent, make sure the meter is functioning cor-
rectly. 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 disconnecting
the common test lead.

•

When using the meter function, keep the DRB
away from spark plug or coil wires to avoid
measuring error from outside interference.

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

VEHICLE,

SURE

THAT

ALL

COMPONENTS

ARE

REASSEMBLED.

DURING THE TEST DRIVE, DO NOT TRY TO
READ

THE

DRBIII

SCREEN

WHILE

MOTION. DO NOT HAND THE DRBIII

FROM

THE REAR VIEW MIRROR OR OPERATE IT
YOURSELF.

HAVE

ASSISTANT

AVAILABLE TO OPERATE THE DRBIII

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 continuity at any control

module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation; this will damage it and eventually cause
it to fail because of corrosion.

Be careful when performing electrical tests so as

to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.

GENERAL INFORMATION

5.0

REQUIRED TOOLS AND
EQUIPMENT

DRBIII

t (diagnostic read-out box) scan tool

Evaporative System Diagnostic Kit #6917
fuel filler adapter #8382
fuel pressure adapter (C-6631) or #6539
fuel pressure kit (C-4799-B) or #5069
fuel release hose (C-4799-1)
min air flow fitting #6714
jumper wires
ohmmeter
oscilloscope
vacuum gauge
voltmeter
12 volt test light minimum 25 ohms resistance

with probe #6801

CAUTION: A 12 VOLT TEST LIGHT SHOULD
NOT

USED

FOR

THE

FOLLOWING

CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.

•

5 Volt Supply

•

8 Volt Supply

•

J1850 PCI Bus

•

CCD Bus

•

CKP Sensor Signal

•

CMP Sensor Signal

•

Vehicle Speed Sensor Signal

•

O2 Sensor Signal

6.0

GLOSSARY OF TERMS

ABS

anti-lock brake system

backfire,
popback

fuel ignites in either the intake or
the exhaust system

CKP

crank position sensor

CMP

camshaft position sensor

cuts out,
misses

a steady pulsation or the inability of
the engine to maintain a consistent
rpm

DLC

data link connector (previously
called “engine diagnostic connector”)

detona-
tion,
spark
knock

a mild to severe ping, especially un-
der loaded engine conditions

ECT

engine coolant temperature sensor

EGR

exhaust gas recirculation valve and
system

EMCC

Electronic Modulated Convertor
Clutch

genera-
tor

previously called “alternator”

hard
start

The engine takes longer than usual
to start, even though it is able to
crank normally.

hesita-
tion, sag,
stumble

There is a momentary lack of re-
sponse when the throttle is opened.
This can occur at all vehicle speeds.
If it is severe enough, the engine
may stall.

IAT

intake air temperature sensor

IAC

idle air control valve

JTEC

Combined engine and transmission
control module

lack of
power,
sluggish

The engine has less than expected
power, with little or no increase in
vehicle speed when the throttle is
opened.

LDP

Leak Detection Pump

MAP

manifold absolute pressure sensor

MIL

malfunction indicator lamp

MTV

Manifold Tuning Valve

O2S

oxygen sensor

PCI

Programmable Communication In-
terface

PCM

powertrain control module

PCV

positive crankcase ventilation

PEP

Peripheral Expansion Port

poor fuel
economy

There is significantly less fuel mile-
age than other vehicles of the same
design ad configuration

GENERAL INFORMATION

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