transmission CHRYSLER VOYAGER 2001 Service Manual

message the PCM will terminate engine operation,
or allow the engine to continue to operate.
3.2.7 SKIM ON-BOARD DIAGNOSTICS
The SKIM has been programmed to transmit and
monitor many different coded messages as well as
PCI Bus messages. This monitoring is called On
Board Diagnosis.
Certain criteria must be met for a diagnostic
trouble code to be entered into the SKIM memory.
The criteria may be a range of; Input voltage, PCI
Bus message, or coded messages to the SKIM. If all
of the criteria for monitoring a circuit or function
are met and a fault is sensed, a diagnostic trouble
code will be stored in the SKIM memory.
3.2.8 SKIS OPERATION
When ignition power is supplied to the SKIM, the
SKIM performs an internal self-test. After the self-
test is completed, the SKIM energizes the antenna
(this activates the transponder chip) and sends a
challenge to the transponder chip. The transponder
chip responds to the challenge by generating an
encrypted response message using the following:
Secret Key -This is an electronically stored
value (identification number) that is unique to each
SKIS. The secret key is stored in the SKIM, PCM
and all ignition key transponders.
Challenge- This is a random number that is
generated by the SKIM at each ignition key cycle.
The secret key and challenge are the two vari-
ables used in the algorithm that produces the
encrypted response message. The transponder uses
the crypto algorithm to receive, decode and respond
to the message sent by the SKIM. After responding
to the coded message, the transponder sends a
transponder I.D. message to the SKIM. The SKIM
compares the transponder I.D. to the available valid
key codes in the SKIM memory (8 key maximum at
any one time). After validating the key ignition the
SKIM sends a PCI Bus message called a Seed
Request to the engine controller then waits for a
PCM response. If the PCM does not respond, the
SKIM will send the seed request again. After three
failed attempts the SKIM will stop sending the seed
request and store a trouble code. If the PCM sends
a seed response, the SKIM sends a valid/invalid key
message to the PCM. This is an encrypted message
that is generated using the following:
VIN -Vehicle Identification Number
Seed -This is a random number that is generated
by the PCM at each ignition key cycle.
The VIN and seed are the two variables used in
the rolling code algorithm that encrypts the valid/
invalid key message. The PCM uses the rolling code
algorithm to receive, decode and respond to the
valid/invalid key message sent by the SKIM. Aftersending the valid/invalid key message the SKIM
waits 3.5 seconds for a PCM status message from
the PCM. If the PCM does not respond with a valid
key message to the SKIM, a fault is detected and a
trouble code is stored.
The SKIS incorporates a VTSS LED located on
the instrument panel upper cover. The LED re-
ceives switched ignition voltage and is hardwired to
the body control module. The LED is actuated when
the SKIM sends a PCI Bus message to the body
controller requesting the LED on. The body control-
ler then provides the ground for the LED. The
SKIM will request VTSS LED operation for the
following:
± bulb checks at ignition on
± to alert the vehicle operator to a SKIS mal-
function
± customer key programming mode
For all faults except transponder faults and VTSS
LED remains on steady. In the event of a transpon-
der fault the LED flashes at a rate of 1 Hz (once per
second). If a fault is present the LED will remain on
or flashing for the complete ignition cycle. If a fault
is stored in SKIM memory which prevents the
system from operating properly, the PCM will allow
the engine to start and run (for 2 seconds) up to six
times. After the sixth attempt, the PCM disables
the starter relay until the fault is corrected.
3.2.9 PROGRAMMING THE POWERTRAIN
CONTROL MODULE
Important Note:Before replacing the PCM for a
failed driver, control circuit or ground circuit, be
sure to check the related component/circuit integ-
rity for failures not detected due to a double fault in
the circuit. Most PCM driver/control circuit failures
are caused by internal failure to components (i.e.
12-volt pull-ups, drivers and ground sensors). These
failures are difficult to detect when a double fault
has occurred and only one DTC has set.
NOTE: IF THE PCM AND THE SKIM ARE
REPLACED AT THE SAME TIME, PROGRAM
THE VIN INTO THE PCM FIRST. ALL VEHICLE
KEYS WILL THEN NEED TO BE REPLACED
AND PROGRAMMED TO THE NEW SKIM.
The SKIS Secret Key is an I.D. code that is
unique to each SKIS. This code is programmed and
stored in the SKIM, engine controller and transpon-
der chip (ignition key). When replacing the PCM it
is necessary to program the secret key into the
PCM.
1. Turn the ignition on (transmission in park/
neutral).
2. Use the DRB and select THEFT ALARM, SKIM
then MISCELLANEOUS.
6
GENERAL INFORMATION

3. Select PCM REPLACED.
4. Enter secured access mode by entering the vehi-
cle four-digit PIN.
NOTE: IF THREE ATTEMPTS ARE MADE TO
ENTER THE SECURE ACCESS MODE USING
AN INCORRECT PIN, SECURED ACCESS
MODE WILL BE LOCKED OUT FOR ONE
HOUR. TO EXIT THIS LOCKOUT MODE,
TURN THE IGNITION TO THE RUN POSITION
FOR ONE HOUR THEN ENTER THE
CORRECT PIN. (ENSURE ALL ACCESSORIES
ARE TURNED OFF. ALSO MONITOR THE
BATTERY STATE AND CONNECT A BATTERY
CHARGER IF NECESSARY).
5. Press ENTER to transfer the secret key (the
SKIM will send the secret key to the PCM).
3.2.10 PROGRAMMING THE SENTRY KEY
IMMOBILIZER MODULE
NOTE: IF THE PCM AND THE SKIM ARE
REPLACED AT THE SAME TIME, PROGRAM
THE VIN INTO THE PCM FIRST. ALL VEHICLE
KEYS WILL THEN NEED TO BE REPLACED
AND PROGRAMMED TO THE NEW SKIM.
1. Turn the ignition on (transmission in park/
neutral).
2. Use the DRB and select THEFT ALARM, SKIM
then MISCELLANEOUS.
3. Select SKIM MODULE REPLACEMENT (GAS-
OLINE).
4. Program the vehicle four-digit PIN into the
SKIM.
5. Select COUNTRY CODE and enter the correct
country.
NOTE: BE SURE TO ENTER THE CORRECT
COUNTRY CODE. IF THE INCORRECT
COUNTRY CODE IS PROGRAMMED INTO
SKIM, THE SKIM MUST BE REPLACED.
6. Select UPDATE VIN (the SKIM will learn the
VIN from the PCM).
7. Press ENTER to transfer the VIN (the PCM will
send the VIN to the SKIM).
8. The DRB will ask if you want to transfer the
secret key. Select ENTER to transfer secret key
from the PCM. This will ensure the current
vehicle ignition keys will still operate the SKIS
system.
3.2.11 PROGRAMMING THE IGNITION
KEYS TO THE SENTRY KEY
IMMOBILIZER MODULE
1. Turn the ignition on (transmission in park/
neutral).
2. Use the DRB and select THEFT ALARM, SKIM,
then MISCELLANEOUS.
3. Select PROGRAM IGNITION KEYS.
4. Enter secured access mode by entering the vehi-
cle four-digit PIN.
NOTE: A MAXIMUM OF EIGHT KEYS CAN BE
LEARNED TO EACH SKIM AT ONE TIME.
ONCE A KEY IS LEARNED TO A SKIM IT (THE
KEY) CANNOT BE TRANSFERRED TO
ANOTHER VEHICLE.
If ignition key programming is unsuccessful, the
DRB will display one of the following messages:
Programming Not Attempted- The DRB at-
tempts to read the programmed key status and
there are no keys programmed in the SKIM mem-
ory.
Programming Key Failed -(Possible Used Key
From Wrong Vehicle) - SKIM is unable to program
key due to one of the following:
± faulty ignition key transponder
± ignition key is programmed to another vehicle.
8 Keys Already Learned, Programming Not
Done- SKIM transponder ID memory is full.
1. Obtain ignition keys to be programmed from
customer (8 keys maximum)
2. Using the DRB, erase all ignition keys by select-
ing MISCELLANEOUS and ERASE ALL CUR-
RENT IGN. KEYS
3. Program all ignition keys.
Learned Key In Ignition- Ignition key transpon-
der ID is currently programmed in SKIM memory.
3.3 DIAGNOSTIC TROUBLE CODES
Each diagnostic trouble code is diagnosed by
following a specific testing procedure. The diagnos-
tic test procedures contain step-by-step instructions
for determining the cause of trouble codes as well as
no trouble code problems. It is not necessary to
perform all of the tests in this book to diagnose an
individual code.
Always begin by reading the diagnostic trouble
codes using the DRBIIIt.
3.3.1 HARD CODE
A diagnostic trouble code that comes back within
one cycle of the ignition key is a hard code. This
means that the defect is there every time the
7
GENERAL INFORMATION

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 DTC could be set, making diagnosis of the
original problem more difficult.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(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 BE USED FOR THE FOLLOWING
CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.
²5 Volt Supply
²8 Volt Supply
²J1850 PCI Bus
²CCD Bus
²CKP Sensor Signal
²CMP Sensor Signal
²Vehicle Speed Sensor Signal
²O2 Sensor Signal
6.0 GLOSSARY OF TERMS
ABSanti-lock brake system
backfire,
popbackfuel ignites in either the intake or
the exhaust system
CKPcrank position sensor
CMPcamshaft position sensorcuts out,
missesa steady pulsation or the inability of
the engine to maintain a consistent
rpm
DLCdata link connector (previously
called engine diagnostic connector)
detona-
tion,
spark
knocka mild to severe ping, especially un-
der loaded engine conditions
ECTengine coolant temperature sensor
EGRexhaust gas recirculation valve
genera-
torpreviously called alternator
hard
startThe engine takes longer than usual
to start, even though it is able to
crank normally.
hesita-
tion, sag,
stumbleThere 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.
IATintake air temperature sensor
IACidle air control motor
JTECCombined engine and transmission
control module
lack of
power,
sluggishThe engine has less than expected
power, with little or no increase in
vehicle speed when the throttle is
opened.
LDPleak detection pump
MAPmanifold absolute pressure sensor
MILmalfunction indicator lamp
MTVmanifold tuning valve
O2Soxygen sensor
PCIprogrammable communication inter-
face
PCMpowertrain control module
PCVpositive crankcase ventilation
PEPperipheral expansion port
poor fuel
economyThere is significantly less fuel mile-
age than other vehicles of the same
design ad configuration
12
GENERAL INFORMATION

rough,
unstable,
or er-
ratic idle
stallingThe engine runs unevenly at idle
and causes the engine to shake if it
is severe enough. The engine idle
rpm may vary (called hunting). This
condition may cause stalling if it is
severe enough.
SBECsingle board engine controller
SKIMsentry key immobilizer module
SKISsentry key immobilizer systemstart &
stallThe engine starts but immediately
dies.
surgeengine rpm fluctuation without cor-
responding change in throttle posi-
tion sensor
TPSthrottle position sensor
TRStransmission range sensor
VSSvehicle speed sensor/signal
13
GENERAL INFORMATION

Symptom:
P1698-NO BUS MESSAGE FROM TRANS CONTROL MODULE
When Monitored and Set Condition:
P1698-NO BUS MESSAGE FROM TRANS CONTROL MODULE
When Monitored: Equipped with automatic transmission. The ignition on. Battery
voltage greater than 10 volts.
Set Condition: No bus messages from the TCM for 20 seconds, two trips required.
POSSIBLE CAUSES
INTERMITTENT CONDITION
COMMUNICATE WITH TCM
PCM
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTCs.
Cycle the ignition key on and off several times.
With the DRBIIIt, read DTC's.
Does the DTC reset?All
Ye s®Go To 2
No®Go To 3
2 Turn the ignition on.
With the DRBIIIt, attempt to communicate with the TCM.
Can communication be established with the TCM?All
Ye s®Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No®Refer to the Communication Category and perform the appropri-
ate symptom related to no communication with TCM.
Perform POWERTRAIN VERIFICATION TEST VER-1.
32
COMMUNICATION

Symptom:
*NO RESPONSE FROM PCM (SCI ONLY)
POSSIBLE CAUSES
CHECK PCM POWERS AND GROUNDS
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
TRANSMISSION CONTROL MODULE
SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE
SCI CIRCUITS SHORTED TOGETHER
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
GROUND CIRCUITS AT DLC OPEN
POWERTRAIN CONTROL MODULE
TEST ACTION APPLICABILITY
1 Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?All
Ye s®Go To 2
No®Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER-1.
2 Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?All
Ye s®Go To 3
No®Go To 4
3 Turn the ignition off.
Disconnect the TCM harness connector (if equipped).
NOTE: If vehicle is not equipped with a TCM, answer yes to the question.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?All
Ye s®Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER-1.
No®Replace the Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER-1.
37
COMMUNICATION

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the TP Sensor harness connector.
With the DRBIIIt, monitor the TP Sensor voltage.
Turn the ignition on.
Is the voltage above 4.5 volts?All
Ye s®Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 4
4 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the TP Sensor Signal circuit in the TP Sensor harness
connector to ground.
Is the resistance below 100 ohms?All
Ye s®Repair the Throttle Position Sensor Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 5
5 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the TP Sensor Signal circuit and the Sensor ground
circuit in the TP Sensor harness connector.
Is the resistance below 100 ohms?All
Ye s®Repair the Throttle Position Sensor Signal circuit for a short to
the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 6
6 Turn the ignition off.
Disconnect the TP Sensor harness connector.
Disconnect the TCM harness connector.
With the DRBIIIt, monitor the TP Sensor voltage.
Turn the ignition on.
Is the voltage above 4.5 volts?All
Ye s®Replace the Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 7
7 If there are no possible causes remaining, view repair. All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
65
DRIVEABILITY - GAS
P0122-THROTTLE POSITION SENSOR VOLTAGE LOW ÐContinued

Symptom:
P0500-NO VEHICLE SPEED SIGNAL (3SP AUTO AND MANUAL
TRANSMISSIONS)
When Monitored and Set Condition:
P0500-NO VEHICLE SPEED SIGNAL (3SP AUTO AND MANUAL TRANSMIS-
SIONS)
When Monitored: With the engine running, transmission not in park or neutral, brakes
not applied, and engine rpm greater than 1800.
Set Condition: This code will set if no vehicle speed signal is received from the Vehicle
Speed Sensor for more than 7.2 seconds for 2 consecutive trips.
POSSIBLE CAUSES
INTERMITTENT CONDITION
8 VOLT SUPPLY CIRCUIT OPEN
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
VEHICLE SPEED SENSOR SIGNAL CIRCUIT OPEN
PCM VSS SIGNAL
SENSOR GROUND CIRCUIT OPEN
VEHICLE SPEED SENSOR
TEST ACTION APPLICABILITY
1 Raise the drive wheels off the ground.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Start the engine.
With the DRBIIIt, monitor the Vehicle Speed Sensor
Place the transmission in any forward gear.
Allow the wheels to rotate.
Does the DRBIIItdisplay vehicle speed above 0 MPH/KMH?All
Ye s®Go To 2
No®Go To 3
147
DRIVEABILITY - GAS

Symptom:
P0500-NO VEHICLE SPEED SIGNAL (4SP AUTO TRANS)
When Monitored and Set Condition:
P0500-NO VEHICLE SPEED SIGNAL (4SP AUTO TRANS)
When Monitored: With the engine running, transmission not in park or neutral, brakes
not applied, and engine rpm greater than 1800.
Set Condition: This code will set if no vehicle speed signal is received from the TCM
(transmission control module) for more than 7.2 seconds for 2 consecutive trips.
POSSIBLE CAUSES
INTERMITTENT CONDITION
VEHICLE SPEED SENSOR SIGNAL SHORTED VOLTAGE
VSS SIGNAL FROM TCM
VEHICLE SPEED SENSOR SIGNAL SHORTED TO GROUND
VEHICLE SPEED SENSOR SIGNAL OPEN
PCM VSS SIGNAL
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTC's.
Is the Good Trip displayed and equal to zero?All
Ye s®Go To 2
No®Go To 7
2 Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
Measure the voltage of the VSS Signal circuit in the TCM harness connector.
Is the voltage above 6.0 volts?All
Ye s®Repair the Vehicle Speed Sensor Signal circuit for a short to
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 3
150
DRIVEABILITY - GAS

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
Connect a jumper wire to the VSS Signal circuit in the TCM harness connector.
With the DRBIIIt, monitor the Vehicle Speed Signal display.
Tap the other end of the jumper wire rapidly to ground.
Does the Vehicle Speed Signal display the MPH/KMH above 0?All
Ye s®Go To 4
No®Replace the Transmission Comtrol Module in accordance with the
Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
4 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the TCM harness connector.
Measure the resistance of the Vehicle Speed Sensor Signal circuit in the PCM
harness connector to ground.
Is the resistance below 5.0 ohms?All
Ye s®Repair the Vehicle Speed Sensor Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No®Go To 5
5 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the TCM harness connector
Measure the resistance of the Vehicle Speed Sensor Signal circuit between the PCM
harness connector and the TCM harness connector.
Is the resistance below 5.0 ohms?All
Ye s®Go To 6
No®Repair the Vehicle Speed Sensor Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6 If there is no possible causes remaining, view repair. All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
151
DRIVEABILITY - GAS
P0500-NO VEHICLE SPEED SIGNAL (4SP AUTO TRANS) ÐContinued