SYSTEM, Auto Sway Bar (ASBS) - 2012 Jeep Wrangler JK Factory Service Manual

C2100-BATTERY VOLTAGE LOW

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Continuously.
Set Condition:
The Automatic Sway-Bar System (ASBS) detects that system voltage is below 9.0 volts for 60 seconds.

Possible Causes
INTERMITTENT BATTERY VOLTAGE LOW
CHARGING SYSTEM DTCS PRESENT
(A959) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE
AUTOMATIC SWAY-BAR SYSTEM (ASBS)

1. CHARGING SYSTEM DTCS PRESENT

1.	Ignition on.

2.	With the scan tool, select View DTCs in the Powertrain Control Module (PCM).

Are there any Charging System or related voltage DTCs present?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No

Go To 2

2. DTC IS ACTIVE

1.	With the scan tool, select View DTCs in the ASBS.

Is the status Active for this DTC?

Yes

Go To 3

No

Go To 5

3. (A959) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE

1.	Turn the ignition off.

2.	Disconnect the ASBS harness connector.

3.	Ignition on, engine not running.

4.	With a 12-volt test light connected to ground, check the (A959) Fused B+ circuit in the ASBS harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

Go To 4

No

Repair the (A959) Fused B+ circuit for an open circuit or high resistance.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

4. AUTOMATIC SWAY-BAR SYSTEM (ASBS)

View repair.

Repair

Replace the Automatic Sway-Bar System (ASBS) in accordance with the Service Information.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

5. INTERMITTENT WIRING AND CONNECTORS

1.	The conditions necessary to set this DTC are not present at this time.

2.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

3.	While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

4.	Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

Repair as necessary.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

No

Test complete.

C2101-BATTERY VOLTAGE HIGH

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Continuously.
Set Condition:
The Automatic Sway-Bar System (ASBS) detects that system voltage is above 16.0 volts for ten seconds with engine RPM greater than 350.

Possible Causes
INTERMITTENT BATTERY VOLTAGE HIGH
CHARGING SYSTEM DTCS PRESENT
AUTOMATIC SWAY-BAR SYSTEM (ASBS) POWER CIRCUITS OPEN OR HIGH RESISTANCE
AUTOMATIC SWAY-BAR SYSTEM (ASBS)

1. CHARGING SYSTEM DTCS PRESENT

1.	Turn the ignition on.

2.	With the scan tool, select View DTCs in the Powertrain Control Module (PCM).

Are there any Charging System or related voltage DTCs present?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No

Go To 2

2. DTC IS ACTIVE

1.	With the scan tool, select View DTCs in the ASBS Module.

Is the status Active for this DTC?

Yes

Go To 3

No

Go To 5

3. AUTOMATIC SWAY-BAR SYSTEM (ASBS) GROUND CIRCUITS OPEN OR HIGH RESISTANCE

1.	Turn the ignition off.

2.	Disconnect the ASBS harness connector.

3.	With a 12-volt test light connected to B+, check the Ground circuits in the ASBS harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly for each of the Ground circuits?

Yes

Go To 4

No

Repair the Ground circuit(s) for an open circuit or high resistance.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

4. AUTOMATIC SWAY-BAR SYSTEM (ASBS)

.

Repair

Replace the Automatic Sway-Bar System (ASBS) in accordance with the Service Information.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

5. INTERMITTENT WIRING AND CONNECTORS

1.	The conditions necessary to set this DTC are not present at this time.

2.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

3.	While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.

4.	Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

Repair as necessary.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

No

Test complete.

C2207-OFF-ROAD ECU INTERNAL

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Ignition on. The Automatic Sway-Bar System (ASBS) Module monitors its internal microprocessors for correct operation.
Set Condition:
If the Automatic Sway-Bar System (ASBS) Module detects an internal fault, the DTC is set.

Possible Causes
AUTOMATIC SWAY-BAR SYSTEM (ASBS)

AUTOMATIC SWAY-BAR SYSTEM (ASBS) INTERNAL FAILURE DTC PRESENT

1.	Turn the ignition on.

2.	With the scan tool, read DTCs.

3.	With the scan tool, erase DTCs.

4.	Cycle the ignition switch.

5.	With the scan tool, read DTCs.

Does the scan tool display ASBS INTERNAL FAILURE?

Yes

Replace the Automatic Sway-Bar System (ASBS) in accordance with the Service Information.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

No

Perform the ASBS INTERMITTENT CONDITION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

U0121-LOST COMMUNICATION WITH ABS

For a complete wiring diagram, refer to the Wiring Information.

Possible Causes

When Monitored:
Ignition run time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.
Set Condition:
Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Possible Causes
CAN BUS CIRCUITS OPEN OR SHORTED
ABS MODULE
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
TOTALLY INTEGRATED POWER MODULE POWER AND GROUND
TIPM NOT CONFIGURED CORRECTLY
TOTALLY INTEGRATED POWER MODULE (TIPM)
MODULE THAT SET THIS DTC

ACTIVE DTC

1.	Ignition on, engine not running.

2.	With the scan tool, select view DTCs.

Is the DTC Active at this time?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) and perform the U0121-Lost Communication with Anti-Lock Brake Module diagnostic procedure.

No

(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the Stored Lost Communication DTCs diagnostic procedure.

U0146-LOST COMMUNICATION WITH CENTRAL GATEWAY

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
- With the ignition on
- Battery voltage between 10 and 16 volts
- Ignition Off Draw (IOD) fused installed.
Set Condition:
If the Automatic Sway-Bar System Module either fails to receive bus messages from the Powertrain Control Module (PCM) for approximately 500 ms, or it receives invalid messages from the PCM, or it detects messages from the PCM are of improper data length.

Possible Causes
DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
CAN C BUS CIRCUITS OPEN OR SHORTED
PCM POWER AND GROUND
POWERTRAIN CONTROL MODULE (PCM)
AUTOMATIC SWAY-BAR SYSTEM (ASBS) MODULE

1. VERIFY DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1.	Turn the ignition on.

2.	With the scan tool, read and record ASBS DTCs.

3.	With the scan tool, read and record Environmental Data (EV Data).

4.	With the scan tool, erase ASBS DTCs.

5.	Cycle the ignition switch.

6.	With the scan tool, read ASBS DTCs.

Does this DTC reset?

Yes

Go To 2

No

(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the Stored Lost Communication DTCs diagnostic procedure.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs

1.	With the scan tool, read all active DTCs from all CAN C Bus modules.

NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs related to the conditions listed above?

Yes

Go to and perform the appropriate diagnostic procedure.

No

Go To 3

3. VERIFY THAT THE PCM IS ACTIVE ON THE BUS

1.	With the scan tool, select ECU View.

2.	Verify that the PCM is active on the bus.

Is the ECM active on the bus?

Yes

Go To 4

No

(Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) and perform the No Response from PCM diagnostic procedure.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs

1.	With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs “Logged Against” the PCM?

Yes

Replace/update the Powertrain Control Module (PCM) in accordance with the service information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

No

Replace and program the Final Drive Control Module (FDCM) in accordance with Service Information.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

U0415-IMPLAUSIBLE DATA RECEIVED FROM ABS

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on for four seconds, no CAN bus circuit error condition present, no lost communication with Anti-lock Brake System (ABS) Module condition present, and no system undervoltage or overvoltage condition present.
Set Condition:
The Automatic Sway-Bar System (ASBS) Module is receiving implausible data for vehicle speed, wheel speed.

Possible Causes
ANTILOCK BRAKE SYSTEM DTCS PRESENT
AUTOMATIC SWAY-BAR SYSTEM (ASBS)

ABS DTCS PRESENT

1.	Ignition on, engine not running.

2.	With the scan tool, read DTCs in the ABS Module.

Are there any DTCs present?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No

Replace the Automatic Sway-Bar System (ASBS) in accordance with the Service Information.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

U0447-IMPLAUSIBLE DATA RECEIVED FROM CENTRAL GATEWAY

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Continuously with the ignition on, one valid CAN message is received at least once and no U0002-CAN C Bus Off Performance DTC present.
Set Condition:
When the Automatic Sway-Bar System (ASBS) detects an incorrect CAN message from the Totally Integrated Power Module (TIPM).

Possible Causes
ASBS CAN BUS DTCS
ENGINE DTCS
AUTOMATIC SWAY-BAR SYSTEM (ASBS)

1. CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM TIPM

NOTE: This DTC must be active for the results of this test to be valid.

1.	Ignition on, engine not running.

2.	With the scan tool, record and erase DTCs.

3.	Cycle the ignition switch from off to on.

4.	With the scan tool, read DTCs.

Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?

Yes

Go To 2

No

Perform the ASBS-INTERMITTENT CONDITION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

2. CHECK IF TIPM CAN BUS DTCs ARE PRESENT

1.	With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No

Go To 3

3. CHECK IF ENGINE DTCs ARE PRESENT

1.	With the scan tool, read Engine DTCs.

Are there any Engine DTCs present?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.

No

Using the schematics as a guide, check the Automatic Sway-Bar System (ASBS) 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 the Final Drive Control Module (FDCM) in accordance with Service Information.
Perform ASBS-INTERMITTENT CONDITION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

ASBS INTERMITTENT CONDITION

For a complete wiring diagram, refer to the Wiring Information.

PERFORM ASBS INTERMITTENT CONDITION TEST

NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.

WARNING:

When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

1.	Perform Refer to any Technical Service Bulletins (TSBs) that may apply.

2.	Review the scan tool Environmental Data (EV Data). If possible, try to duplicate the conditions under which the DTC set.

3.	Turn the ignition off.

4.	Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out or corroded terminals.

5.	Wiggle the wires while checking for shorts and open circuits.

6.	Perform a voltage drop test on the related circuits between the suspected faulty component and the Automatic Sway-Bar System (ASBS).

7.	Inspect and clean all Powertrain Control Module , ASBS, engine and chassis grounds that are related to the most current DTC.

8.	If numerous trouble codes were set, use a wire schematic and look for any common ground or supply circuits

9.	For any relay DTCs, actuate the relay with the scan tool and wiggle the related wire harness to try to interrupt the actuation.

10.	Use the scan tool to perform a system test if one applies to failing component.

11.	A co-pilot, data recorder and/or lab scope should be used to help diagnose intermittent conditions.

Were any problems found during the above inspections?

Yes

Perform the necessary repairs.
Perform the ASBS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/SYSTEM, Auto Sway Bar (ASBS) - Standard Procedure).

No

Test Complete.

ASBS VERIFICATION TEST

PERFORM ASBS VERIFICATION TEST

CAUTION:

Before removing the ASBS harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

NOTE: If the WCM/WIN, PCM/ECM or TIPM were replaced, refer to the service information for proper programming procedures.

NOTE: When a Stabilizer System DTC diagnostic is complete and all repairs have been made, running the Stabilizer Motor System Test and/or LED System Test can also provide verification that the DTC has been repaired and the system is operating normally.

Disconnect all jumper wires and reconnect all previously disconnected components and connectors.

Ensure that all accessories are turned off.

Ensure that the battery is fully charged.

With the scan tool, record and erase all DTC(s) from the ASBS

Start and run the engine for 2 minutes while operating all functions of the system that caused the original concern.

Turn the ignition off, wait 5 seconds, then turn the ignition on. Using the scan tool, read DTC(s) from the ASBS.

Are any ASBS DTC(s) present or is the original condition still present?

Yes

The repair is not complete. Refer to the related category for the DTC or symptom that is still present.

No

The repair is complete.

TRANSFER CASE VERIFICATION TEST

TRANSFER CASE VERIFICATION TEST

1.	Disconnect all jumper wires and reconnect all previously disconnected components and connectors.

2.	With the scan tool, select Clear Stored DTCs.

3.	Make sure that all accessories are turned off and that the battery is fully charged.

4.	Test drive the vehicle in each Transfer Case range and verify proper operation in each range.

NOTE: To shift into 4LO (if equipped), vehicle speed must be below 3 M.P.H. (5 KM/H) with the ignition ON and the transmission in neutral (auto trans).

NOTE: To shift the Transfer Case into Neutral, vehicle speed must be 0 M.P.H. with the ignition ON, engine OFF, the brake pedal applied, and the transmission in neutral (auto trans). Shift the Transfer Case until the Neutral Indicator is illuminated solidly and the cluster displays '4WD System in Neutral'.

WARNING:

Apply the parking brake. The vehicle may roll with the Transfer Case in neutral.

NOTE: To verify that the Transfer Case is in Neutral, shift the automatic transmission into reverse and release the brake pedal for three seconds. There should be no vehicle movement if the Transfer Case is in Neutral.

5.	With the scan tool, select View DTCs in the Final Drive Control Module.

Are there any DTCs present in the Final Drive Control Module?

Yes

Perform the appropriate diagnostic procedure.

No

Repair is complete.