3.CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Connect the TIPM C10 harness connector.
Disconnect the Transmission Solenoid harness connector.
Ignition on, engine not running.
Using the scan tool under the TIPM Actuators, actuate the Transmission
control output.
Using a 12-volt test light connected to ground, check the (T16) Trans-
mission Control Output circuit at the Transmission Solenoid harness
connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Ye s>>
Go To 4
No>>
Repair the (T16) Transmission Control Output circuit for an
open.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
4.TOTALLY INTEGRATED POWER MODULE
NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors.
Pay particular attention to allPower and voltage circuits.
Were any problems found?
Ye s>>
Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Replace the Totally Integrated Power Module per Service Information.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
5.INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Ye s>>
Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Te s t c o m p l e t e .
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
Set Condition:
An open condition is detected in the TIPM on the Transmission Control Output circuit.
Possible Causes
(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN
TOTALLY INTEGRATED POWER MODULE (TIPM)
Diagnostic Test
1.CHECK IF THE DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Ye s>>
Go to 2
No>>
Go to 4
2.CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid harness connector.
Ignition on, engine not running.
Using the scan tool under the TIPM Actuators, actuate the Transmission
control output.
Using a 12-volt test light connected to ground, check the (T16) Trans-
mission Control Output circuit at the Transmission Solenoid harness
connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Ye s>>
Go To 3
No>>
Repair the (T16) Transmission control output circuit for an
open.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
3.TOTALLY INTEGRATED POWER MODULE
NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors.
Pay particular attention to allPower and voltage circuits.
Were any problems found?
Ye s>>
Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Replace the Totally Integrated Power Module per Service Information.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
5.CHECK THE TTVA
Turn the ignition off to the lock position.
Disconnect the TTVA harness connector
Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit
and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time,
immediately after the ignition is turned to the on position.
Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the
ignition to the on position?
Ye s>>
Go To 6
No>>
Go To 7
6.CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (K315) TTVA Motor (-)
circuit.
Is the resistance below 5.0 ohms?
Ye s>>
Repair the (K315) TTVA Motor (-) circuit for a short to
ground.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Replace the TTVA per the Service Information (Refer to 21
- TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE/
THROTTLE VALVE ACTUATOR - REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
15.CHECK THE ECM OPERATION
Turn the ignition off to the lock position.
Reconnect all previously disconnected connectors.
Turntheignitiononfortheperiodof30secondstoallowtheECMto
reset.
Turn the ignition off to the lock position.
Disconnect the TTVA harness connector
Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit
and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time,
immediately after the ignition is turned to the on position.
Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the
ignition to the on position?
Ye s>>
Go To 16
No>>
Using the schematics as a guide, check the Engine Control Module (ECM) pins, terminals, and connec-
tors for corrosion, damage, or terminal push out. Pay particular attentiontoallpowerandgroundcir-
cuits. If no problems are found, replace and program the ECM per the ServiceInformation. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CONTROL MODULE - REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
16.INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Use the Freeze Frame Data to help duplicate the conditions in which the DTC originally set. Pay particular attention
to the DTC set conditions, such as, VSS, MAP, ECT, and Load
Using the schematics as a guide, visually inspect the related wiring harness. Look for any chafed, pierced, pinched,
or partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken,bent, pushed out, or corroded terminals.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Were there any problems found?
Ye s>>
Repair as necessary.
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Te s t C o m p l e t e .
2.CHECK THE TTVA
Turn the ignition off to the lock position.
Disconnect the TTVA harness connector
Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit
and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time,
immediately after the ignition is turned to the on position.
Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the
ignition to the on position?
Ye s>>
Go To 3
No>>
Go To 4
3.CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the ECM C1 harness connector.
Measure the resistance between ground and the (K315) TTVA Motor (-)
circuit.
Is the resistance below 5.0 ohms?
Ye s>>
Repair the (K315) TTVA Motor (-) circuit for a short to
ground.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Check the Transmission Throttle Valve components for
proper movement or sticking. If no problems are found
replace the TTVA per the Service Information (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE/
THROTTLE VALVE ACTUATOR - REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
10.CHECK THE (K315) TTVA MOTOR (-) CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
Measure the resistance between the (K315) TTVA Motor (-) circuit and
every other circuit in the ECM C1 and C2 harness connectors.
Is the resistance below 5.0 ohms between the (K315) TTVA
Motor (-) circuit and any other circuit in the ECM C1 and C2
harness connectors?
Ye s>>
Repair the (K315) TTVA Motor (-) for a short to another cir-
cuit(s).
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Go To 11
11 .CHECK THE ECM OPERATION
Turn the ignition off to the lock position.
Reconnect all previously disconnected connectors.
Turntheignitiononfortheperiodof30secondstoallowtheECMto
reset.
Turn the ignition off to the lock position.
Disconnect the TTVA harness connector.
Connect a 12-volt test light between the (K314) TTVA Motor (+) circuit
and the (K315) TTVA Motor (-) circuit in the TTVA harness connector.
Monitor the test light in the following step.
NOTE: The test light should momentarily flash brightly, one time,
immediately after the ignition is turned to the on position.
Ignition on, engine not running.
Did the test light illuminate brightly one time after turning the
ignition to the on position?
Ye s>>
Go To 12
No>>
Using the schematics as a guide, check the Engine Control Module (ECM) pins, terminals, and connec-
tors for corrosion, damage, or terminal push out. Pay particular attentiontoallpowerandgroundcir-
cuits. If no problems are found, replace and program the ECM per the ServiceInformation. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CONTROL MODULE - REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 48RE - STANDARD PROCEDURE)
3.CHECK THE (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT
Ignition on, engine not running.
With the scan tool, actuate the Transmission Control Output in the
ECM.
Using a 12-volt test light connected to ground, back probe the (T16)
Transmission Control Output circuit at the TIPM C10 harness connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light cycle on and off and illuminate brightly?
Ye s>>
Go To 4
No>>
Go To 9
4.CHECK THE (T16) TRANSMISSION CONTROL RELAY OUTPUT CIRCUIT
Ignition on, engine not running.
With the scan tool, actuate the Transmission Control Output in the
ECM.
Using a 12-volt test light connected to ground, back probe the (T16)
Transmission Control Output circuit at the Transmission Solenoid
Assembly harness connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light cycle on and off and illuminate brightly?
Ye s>>
Go To 5
No>>
Repair the (T16) Transmission Control Output Circuit for an
open.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
5.CHECK THE (T75) TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid Assembly harness connector.
Ignition on, engine not running.
With the scan tool, actuate the TCC Solenoid.
Using a 12-volt test light connected to 12-volts, check the (T75) TCC
Solenoid Control circuit in the Transmission Solenoid Assembly harness
connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light cycle on and off and illuminate brightly?
Ye s>>
Check all internal wiring pertaining to the (T75) TCC Sole-
noid for an open, short, and bent or broken terminals. If no
internal wiring problems are found, replace the Transmis-
sion Solenoid Assembly per the Service Information. (Refer
8.(T75) TCC SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS
Measure the resistance between the (T75) TCC Solenoid Control circuit
and all other circuits in the Transmission Solenoid Assembly harness
connector.
Is the resistance below 5.0 ohms between the (T75) TCC Sole-
noid Control circuit and any other circuit in the Transmission
Solenoid Assembly harness connector?
Ye s>>
Repair the (T75) TCC Solenoid Control circuit for a short to
another circuit(s).
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
No>>
Using the schematics as a guide, check the Engine Control
Module (ECM) pins, terminals, and connectors for corrosion,
damage, or terminal push out. Pay particular attention to all
power and ground circuits. If no problems are found,
replace and program the ECM per the Service Information.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES/ENGINE CONTROL MODULE - REMOVAL)
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)
9.CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR OPEN.
Ignition on, engine not running.
Using the scan tool in the TIPM, actuate the Transmission.
Using a 12-volt test light connected to ground, back probe the (T16)
Transmission Control Output circuit at the TIPM C10 harness connector.
Does the test light illuminate brightly?
Ye s>>
Go To 10
No>>
Using the schematics as a guide, check the Totally Inte-
grated Power Module (TIPM) pins, terminals, and connec-
tors for corrosion, damage, or terminal push out. Pay
particular attention to all power and ground circuits. If no
problems are found, replace and program the TIPM per the
Service Information.
Perform RE TRANSMISSION VERIFICATION TEST VER -
1 (DIESEL). (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - 48RE - STANDARD PROCEDURE)