Dodge Ram Truck 1500-2500-3500. Manual — part 14
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
TABLE OF CONTENTS
page
page
ACTIVE CHASSIS - ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
C143D-STABILIZER SELECT SWITCH
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . 3
C143E - STABILIZER BAR SWITCH CIRCUIT
LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
C143F-STABILIZER SELECT SWITCH
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . . 11
C2124-STABILIZER BAR INDICATOR
CONTROL CIRCUIT . . . . . . . . . . . . . . . . . . . . 15
CHECKING STABILIZER SELECT SWITCH
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . 22
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
2 - 2
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
DR/DH
C143D-STABILIZER SELECT SWITCH PERFORMANCE
DR/DH
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
2 - 3
C143D-STABILIZER SELECT SWITCH PERFORMANCE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on.
•
Set Condition:
During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch resistance is out of spec-
ification.
Possible Causes
SWITCH INTERMITTENT
DISCONNECTING STABILIZER BAR SWITCH
(T531) STABILIZER BAR SWITCH SENSE CIRCUIT OPEN/HIGH RESISTANCE
(T536) SWITCH SUPPLY CIRCUIT
FDCM
1.
DTC ACTIVE
CAUTION: Before removing the FDCM 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 con-
nector.
Turn the ignition on, engine not running
With the DRBIII
T
, read FDCM DTC(s).
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Go To 5
2.
DISCONNECTING STABILIZER SWITCH OPERATION
NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is
installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to
do so can result in misdiagnoses of the system.
Turn the ignition off.
Disconnect the Disconnecting Stabilizer Bar Switch harness connector.
Remove the Disconnecting Stabilizer Bar Switch.
Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Switch Supply terminal and the
Stabilizer Bar Switch Sense terminal.
The resistance must read as follows for each position of the switch.
•
Off Road: 33 ohms +/- 5%
•
On Road: 420 ohms +/- 5%
•
Switch Not Applied: 2.2k ohms +/- 5%
Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch?
Yes
>> Go To 3
No
>> Replace the Axle Locker Switch.
Perform FDCM VERIFICATION TEST.
2 - 4
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
DR/DH
C143D-STABILIZER SELECT SWITCH PERFORMANCE (CONTINUED)
3.
(T531) STABILIZER BAR SWITCH SENSE CIRCUIT OPEN
Disconnect the FDCM harness connector.
Measure the resistance of the (T531) Stabilizer Bar Switch Sense cir-
cuit between the Disconnecting Stabilizer Bar Switch and the FDCM
harness connectors.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the open or high resistance in the (T531) Stabilizer
Bar Switch Sense circuit.
Perform FDCM VERIFICATION TEST.
4.
(T536) SWITCH SUPPLY CIRCUIT OPEN
Measure the resistance of the (T536) Switch Supply circuit between
the Disconnecting Stabilizer Bar Switch and the FDCM harness con-
nectors.
Is the resistance below 5.0 ohms?
Yes
>> Replace the FDCM in accordance with the Service Infor-
mation
Perform FDCM VERIFICATION TEST.
No
>> Repair the open or high resistance in the (T536) Switch
Supply circuit.
Perform FDCM VERIFICATION TEST.
DR/DH
ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS
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