Jeep Liberty KJ. Manual — part 1007
P0605-INTERNAL CONTROL MODULE ROM
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
One time after the ignition key is turned to the run position.
•
Set Condition:
If the ROM checksum does not match a known constant.
Possible Causes
PCM - INTERNAL ERROR
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
After the controller is reset, the microprocessor checks the integrity of the program memory (ROM). A checksum is
calculated by adding all used bytes in the program memory. The sum should be the same as a known constant
stored in memory. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.
Diagnostic Test
1.
PCM - INTERNAL ERROR
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention
to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Ser-
vice Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems
are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
KJ
P0613-INTERNAL TRANSMISSION PROCESSOR
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
After the ignition key is turned to the run position and 60 seconds thereafter.
•
Set Condition:
Either of the following conditions occur 3 times in less than 590 milliseconds: The watchdog line remains high
after the watchdog test or the transmission relay coil is energized and remains on after the watchdog delay
expires.
Possible Causes
PCM - INTERNAL ERROR
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
The internal watchdog is a separate hardware circuit which continuously monitors the microprocessor. To make sure
the transmission is operating properly, the watchdog must receive a signal from the microprocessor within a specific
time window. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.
Diagnostic Test
1.
PCM - INTERNAL ERROR
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention
to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,
damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Ser-
vice Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems
are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
KJ
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
21 - 73
P0706-TRANSMISSION RANGE SENSOR RATIONALITY
For a complete wiring diagram Refer to Section 8W.
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AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
The DTC will set if the controller detects an invalid PRNDL code which lasts for more than 0.042 seconds.
Possible Causes
SHIFTER OUT OF ADJUSTMENT
TRS SENSE CIRCUIT OPEN
TRS SENSE CIRCUIT SHORT TO GROUND
TRS SENSE CIRCUIT SHORT TO VOLTAGE
METAL DEBRIS IN OIL PAN
TRANSMISSION RANGE SENSOR
POWERTRAIN CONTROL MODULE
Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
Theory of Operation
The C1 through C4 (T1, T3, T41, and T42) sense circuits communicate the shift lever position to the PCM. Each
circuit is terminated at the transmission with a switch. Each switch can be either open or closed, depending on the
shift lever position. The PCM can decode this information and determine the shift lever position. Each shift lever
position has a certain combination of switches, which will be open and closed, this is called a PRNDL code. There
are 4 switches, therefore: there are many possible combinations of open and closed switches (codes). However,
there are only 9 valid codes (8 for AutoStick), one for each gear position and three recognized between gear codes.
The remainder of the codes should never occur, these are called invalid codes. The following chart shows the nor-
mal switch states for each shift lever position.
TRS SWITCH STATES
SLP
T42
T41
T3
T1
P
CLOSED
CLOSED
CLOSED
OPEN
R
CLOSED
OPEN
OPEN
OPEN
N
CLOSED
CLOSED
OPEN
CLOSED
OD
OPEN
OPEN
OPEN
CLOSED
3
OPEN
OPEN
CLOSED
OPEN
L
CLOSED
OPEN
CLOSED
CLOSED
Diagnostic Test
1.
CHECK TO SEE IF P0706 DTC IS CURRENT
With the scan tool, perform the Shift Lever Position Test.
Select the test outcome from the following:
Test passes:
Go To 6
Test fails with Error Code:
Go To 2
Test fails without Error Code:
Perform the Gearshift Adjustment Procedure per the Service Information.
Perform the PRNDL Fault Clearing Procedure – Go To 7
KJ
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
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