Jeep Grand Cherokee WK. Manual — part 156
C1219-STEERING ANGLE SENSOR ERRATIC PERFORMANCE (CONTINUED)
9.
CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (D64) CAN C (-) BUS
circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (D64) CAN C (-) BUS circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 10
10.
CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (D64) CAN C (+) BUS circuit.
Is there any voltage present?
Yes
>> Repair the (D64) CAN C (-) BUS circuit for a short to volt-
age.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 11
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C1219-STEERING ANGLE SENSOR ERRATIC PERFORMANCE (CONTINUED)
11.
CHECK THE (D64) CAN C (-) BUS CIRCUIT FOR AN OPEN CIRCUIT
Turn the ignition off.
Measure the resistance of the (D64) CAN C (-) Bus circuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Steering Control Module in accordance with
the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Repair the (D64) CAN C (-) BUS circuit for an open circuit.
Perform ABS VERIFICATION TEST - VER 1.
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 251
C121C-TORQUE REQUEST SIGNAL DENIED
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
WK
C121C-TORQUE REQUEST SIGNAL DENIED (CONTINUED)
For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
When the Anti-Lock Brake Module indicates if engine management relevant for Automatic Yaw Control/Traction
Control System control can be accomplished.
Possible Causes
TERMINAL/CONNECTOR/WIRING HARNESS DAMAGE
(D65) CAN C (+) BUS AND (D64) CAN C (-) BUS CIRCUITS SHORTED TOGETHER
(D65) CAN C (+) BUS CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
(D64) CAN C (-) BUS CIRCUIT SHORTED TO VOLTAGE, GROUND, OR OPEN
POWERTRAIN CONTROL MODULE
Diagnostic Test
1.
CHECK FOR A DTC C121C-TORQUE REQUEST SIGNAL DENIED
NOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, read and record DTC’s.
With the scan tool, read and record Freeze Fame information.
With the scan tool, erase DTC’s.
Cycle the ignition switch from off to on.
With the scan tool, read and record DTC’s.
Does the scan tool display: C121C-TORQUE REQUEST SIGNAL DENIED?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION diagnostic procedure.
Perform ABS VERIFICATION TEST - VER 1.
2.
CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE
Check all related wiring for bruised, chafed, pierced, or partially broken wires.
Check all related connectors for broken, bent, pushed out, or corroded terminals.
Were any problems found?
Yes
>> Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
>> Go To 3
WK
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 253
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