Chrysler PT Cruiser. Manual - part 993

3.3.3

INTERMITTENT CODE

A diagnostic trouble code that is not there every

time the Transmission Control System checks the
circuit or function is an a intermittent code. Some
intermittent codes, such as codes P1684(12),
P0891(14),

P0888(15),

P0725(18),

P1694(19),

P0871(21),

P0846(22),

P0841(24),

P0706(28),

P0120(29),

P0750(41),

P0755(42),

P0760(43),

P0765(44),

P0715(56),

P0720(57),

P1794(58),

P0951(70), P1799(74), P0884(76), P1687(77), and
P1652(78) are caused by wiring or connector prob-
lems. However intermittent codes 50 - 54 are usu-
ally caused by intermittent hydraulic seal leakage
in the clutch and/or accumulator circuits. Problems
that come and go like this are the most difficult to
diagnose, they must be looked for under the specific
conditions that cause them.

3.3.4

STARTS SINCE SET COUNTER

For the most recent code, the Starts Since Set

counter counts the number of times the vehicle has
started since it was last set. The counter will count
up to 255 starts. Note that this code only applies to
the last or most recent code set.

When there are no diagnostic trouble codes stored

in memory, the DRBIII

t will display NO DTC’S

PRESENT and the reset counter will show
“STARTS SINCE CLEAR =XXX

The number of starts helps determine if the

diagnostic trouble code is hard or intermittent.

– If the count is less that 3, the code is usually a

hard code.

– If the count is greater than 3, it is considered

an intermittent code. This means that the
engine has been started most of the time
without the code recurring.

3.3.5

TROUBLE CODE ERASURE

A Diagnostic trouble code will be cleared from

Transmission Control System memory if it has not
reset for 40 warm-up cycles.

A warm-up cycle is defined as sufficient vehicle

operation such that the coolant temperature has risen

by at least 22°C (40°F) from engine starting and
reaches a minumum temperature of 71°C (160°F).

The Malfunction Indicator Lamp (MIL) will turn

off after 3 good trips or when the DTC’s are cleared
from the Transmission Control System.

3.3.6

EATX DTC EVENT DATA

EATX DTC EVENT DATA can be used as a

diagnostic aid when experiencing Electronic Trans-
missions with intermittent problems. When a Diag-
nostic Trouble Code (DTC) is set, the vehicles EATX
inputs are stored in the controller memory and are
retrievable with the DRBIII

t. This information can

be helpful when a DTC can not be duplicated.

The EATX DTC EVENT DATA is located in the

DRBIII

t, under the Transmission system menu, in

the sub-screen Miscellaneous. It is a good practice
to document the EATX DTC EVENT DATA before
beginning any diagnostic or service procedure.

A thorough understanding of how the transmis-

sion works is beneficial in order to interpret the
data correctly. These skills are necessary in order to
avoid an incorrect diagnosis.

A MASTERTECH video and reference book was

produced in January 2002 that explains many of
the features of the EATX DTC EVENT DATA with
several examples on how to interpret the informa-
tion and suggested training material to help under-
stand all the specifics.

EATX DTC EVENT DATA can only be erased by:

1. Disconnecting the battery.

2. Performing a DRBIII

t QUICK LEARN proce-

dure.

3. Reprogramming the EATX controller.

Erasing Transmission DTCs does not clear the

EATX DTC EVENT DATA.

3.3.7

LIST OF DIAGNOSTIC TROUBLE
CODES (DETAILED DESCRIPTIONS
FOLLOW LIST)

The Transmission Control System may report

any of the following DTC’s.

The Transmission Control System may report any of the following DTC’s.
DTC

P-Code

Name of Code

Limp-in MIL

P0613

Internal TCM

Yes

P1684

Battery was disconnected

P0613

Internal TCM

Yes

P0891

Transmission Relay always on

Yes

P0888

Relay output always off

Yes

P0605

Internal TCM

Yes

P0604

Internal TCM

Yes

P0725

Engine speed sensor circuit

Yes

P1694

Bus communication with engine module

-2

GENERAL INFORMATION

The Transmission Control System may report any of the following DTC’s.
DTC

P-Code

Name of Code

Limp-in MIL

P0890

Switched battery

Yes

P0871

OD pressure switch sense circuit

Yes

-1

P0846

2/4 pressure switch sense circuit

Yes

P0841

LR pressure switch sense circuit

Yes

P0706

Check shifter signal

P0124

Throttle Position Sensor/APPS intermittent

Yes

-3

P0122

Throttle Position Sensor/APPS low

Yes

-3

P0123

Throttle Position Sensor/APPS high

Yes

-3

P0870

OD hydraulic pressure test failure

Yes

P0845

2/4 hydraulic pressure test failure

Yes

P0992

2-4/OD hydraulic pressure test failure

Yes

P0944

Loss of prime

P1790

Fault immediately after shift

P1775

Solenoid switch valve latched in TCC position

Yes

P0740

Torque converter clutch control circuit

Yes

P0750

LR Solenoid circuit

Yes

P0755

2/4 Solenoid circuit

Yes

P0760

OD Solenoid circuit

Yes

P0765

UD Solenoid circuit

Yes

P0613

Internal TCM

P1776

Solenoid switch valve latched in LR position

Yes

P0736

Gear ratio error in reverse

Yes

P0731

Gear ratio error in 1st

Yes

P0732

Gear ratio error in 2nd

Yes

P0733

Gear ratio error in 3rd

Yes

P0734

Gear ratio error in 4th

Yes

P0715

Input speed sensor error

Yes

P0720

Output speed sensor error

Yes

P1794

Speed sensor ground error

Yes

P0952

AutoStick input circuit low

P0953

AutoStick input circuit high

P1797

Manual shift overheat

P0897

Worn out/burnt transaxle fluid

P0711

Transmission temperature sensor performance

P0712

Transmission temperature sensor low

P0713

Transmission temperature sensor high

P0714

Transmission temperature sensor intermittent

P0218

High temperature operation activated

P0884

Power up at speed

P1687

No communication with the MIC

P1652

Serial communication link malfunction

-2

P0562

Low battery voltage

Yes

P0613

Internal TCM

Yes

Notes:
P1xxx DTC’s will set the MIL only after 10 seconds of vehicle operation.
1 - The MIL will be lit only if DTC P0706 is also present
2 - The MIL will be lit by the engine controller
3 - The MIL will be lit only if the engine controller is not calibrated for throttle substitution.
Yes (underlined) indicates that this DTC can take up to five minutes of problem identification before
illuminating the MIL.

GENERAL INFORMATION

3.3.8

DTC DESCRIPTIONS

Name of code: P0613(11, 13, 45, 94) - Internal
TCM
When monitored: Whenever the key is in the Run
or Run/Start position.
Set condition: This code is set whenever Trans-
mission Control System senses an internal error.
Theory of operation: The PCM is constantly
monitoring its internal processor. If an internal
problem is detected, this DTC will be set. This DTC
can also be set by a bad ground to the PCM and/or
Trans Control Relay.
Transmission Effects: The MIL will illuminate
(this DTC can take up to five minutes of problem
identification before illuminating the MIL) and the
transmission system will default to the Immediate
Shutdown routine.
Possible causes:

> PCM ground circuit.

> Relay ground circuit

> PCM

Name of code: P1684(12) - Battery was Discon-
nected (Informational code Only)
When monitored: Whenever the key is in the
Run/Start position.
Set condition: This code is set whenever the PCM
is disconnected from battery power (B+) or ground.
It will also be set during the DRBIII

t Battery

Disconnect procedure.
Theory of operation: A battery backed RAM
(Random Access Memory) is used to maintain some
learned values. When the battery B(+) is discon-
nected, the memory is lost. When the B(+) is
restored, this memory loss is detected by the PCM.
The code is set and the learned values are initial-
ized to known constants or previously learned
values from EEPROM (Electronic Erasable Pro-
grammable Read Only Memory). This results in
the reinitialization of some parameters.
Transmission Effects: Loss of trouble code data.
Immediate Limp-in mode if power is lost while
operating the vehicle. Normal operation is re-
sumed if the power is restored during the same key
start.
Possible causes:

> Battery voltage removed from PCM

> PCM disconnected

> Dead Battery

> Low battery voltage during cranking

> Battery Disconnect by DRBIII

t or MDS2

> PCM ground circuit missing.

Name of code: P0891(14) - Transmission Relay
Always On

When monitored: Ignition key is turned from off
position to run position and/or ignition key is
turned from crank position to run position.
Set condition: This code is set if the PCM senses
greater than 3 volts at the Trans Relay Output
(switched battery) terminal of the PCM prior to the
PCM energizing the relay.
Theory of operation: The transmission control
relay is used to supply power to the solenoid pack
when the transmission is in normal operating
mode. When the relay is off, no power is supplied to
the solenoid pack and the transmission is in
Limp-in mode. The relay output is fed back to the
PCM. It is referred to as the Transmission Control
Relay Output circuit or switched battery.
Transmission Effects: The MIL will illuminate
and the transmission system defaults to Logical
Limp-in mode. Logical Limp-in mode results in the
same modes of operation as Limp-in. Since the
relay is stuck “on”, the PCM can not open the relay,
and the PCM shifts to 2nd gear.
Possible causes:

> Relay failure (welded contacts)

> Short to battery in 12-volt supply and/or

Transmission Control Relay Output circuit(s)

> Short to voltage

> PCM connector problems

> PCM

Name of code: P0888(15) - Relay Output Always
Off
When monitored: Continuously
Set condition: This code is set when less than 3
volts are present at the Transmission Control Re-
lay Output (switched battery) terminals at the
PCM, when the PCM is energizing the relay.
Theory of operation: The transmission control
relay is used to supply power to the solenoid pack
when the transmission is in normal operating
mode. When the relay is off, no power is supplied to
the solenoid pack and the transmission is in
Limp-in mode. The relay output is fed back to the
PCM. It is referred to as the Transmission Control
Relay Output circuit or switched battery.

After a controller reset (ignition key turned to

the run position or after cranking engine), the
controller energizes the relay. Prior to this the
PCM verifies that the contacts are open by check-
ing for no voltage at the switched battery termi-
nals. After the relay is energized, the PCM moni-
tors the terminals to verify that the voltage is
greater than 3 volts.
Transmission Effects: The MIL illuminates and
the transmission system defaults to Limp-in mode.

GENERAL INFORMATION

Possible causes:

> Relay failure (intermittent relay function

caused by oxidized or contaminated relay
contacts)

> Short to ground or open circuit in the Trans-

mission Control Relay circuit(s)

> PCM connector problem

> PCM

Name of code: P0725(18) - Engine Speed Sensor
Circuit

NOTE: This code is not a Transmission Input
Speed Sensor DTC

When monitored: Whenever the engine is run-
ning.
Set condition: This code is set when the engine
speed sensed by the PCM is less than 390 RPM or
greater than 8000 RPM for more than 2.0 seconds.
Theory of operation: The PCM uses a new dual
port RAM internal to the controller to send the
Crank Sensor signal to the Transmission Control
System. If the PCM interprets this signal to be out
of range when the engine is running the code is set.
Transmission Effects: The MIL illuminates and
the transmission system defaults to Limp-in mode.
Possible causes:

> Engine DTC (engine rpm related) present

> PCM

Name of code: P1694(19) - Bus Communication
with Engine Module
When monitored: Continuously with key on.
Set condition: If no PCI bus messages are re-
ceived from the Powertrain Control Module (PCM)
for 10 seconds.
Theory of operation: The PCM uses a new dual
port RAM internal to the controller to communi-
cate with the Transmission Control System. The
Transmission Control System relies on certain en-
gine information to function properly. The Trans-
mission Control System continuously monitors the
internal engine bus to check for messages broad-
cast from the PCM.
Transmission Effects: Delayed 3-4 shifts. No
EMCC and early 3-4 shifts for a few minutes after
engine is started.
Possible causes:

> PCM

Name of code: P0890(20) - Switched Battery
When monitored: Ignition key is turned from off
position to run position and/or ignition key is
turned from crank position to run position.
Set condition: This code is set if the PCM senses
voltage on any of the pressure switch inputs prior
to the PCM energizing the relay.
Theory of operation: The transmission control
relay is used to supply power to the solenoid pack

when the transmission is in normal operating
mode. When the relay is off, no power is supplied to
the solenoid pack and the transmission is in
Limp-in mode. The relay output is fed back to the
PCM. It is referred to as the Transmission Control
Relay Output circuit or switched battery.

Immediately after a controller reset (ignition key

turned to the run position or after cranking en-
gine), the PCM verifies that the relay contacts are
open by checking for no voltage at the switched
battery terminals. After this is verified, the voltage
at the pressure switches is checked. There should
be no voltage on the pressure switches at this time.
The PCM will then activate the relay.
Transmission Effects: The MIL illuminates and
the transmission system defaults to Limp-in mode.
Possible causes:

> Short to battery on one or more pressure

switch sense circuits

> PCM connector problems

> PCM

Name of code: P0871(21) - OD Pressure Switch
Sense Circuit
When monitored: Whenever the engine is run-
ning.
Set condition: This code is set if the OD pressure
switch is open or closed at the wrong time in a
given gear.
Theory of operation: The PCM uses three pres-
sure switches to monitor the fluid pressure in the
LR, 2/4, and OD clutch circuits. The pressure
switches are continuously monitored for the correct
states in each gear as shown below.

Transmission Effects: Normal operation will be
experienced if no other codes are present. Trans-
mission Control System will ignore the code.
Limp-in condition will only occur if code P0871(21)
is present with a code P0706(28).
Possible causes:

> If code P0944(35) is present, ignore code

P0871(21) and perform code P0944 diagnostic
procedures

GENERAL INFORMATION

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