Jeep Grand Cherokee WK. Manual — part 120
8. Reconnect the HCU (4) electrical connector (5).
9. Install negative battery cable to the battery.
10. Remove the brake pedal prop rod.
11. Bleed base and ABS brake systems, (Refer to 5 - BRAKES - STANDARD PROCEDURE).
BOOSTER-ACTIVE BRAKE
DESCRIPTION
The active brake booster is part of the Electronic Stability Program (ESP). It is serviced as part of the power brake
booster. For more information on ESP, (Refer to 5 - BRAKES - DESCRIPTION).
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BRAKES - ABS - SERVICE INFORMATION
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BRAKES - BRAKE CONTROLLER ELECTRICAL
DIAGNOSTICS
TABLE OF CONTENTS
page
page
BRAKES - BRAKE CONTROLLER ELECTRICAL
DIAGNOSTICS
DIAGNOSIS AND TESTING
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . 110
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 115
CIRCUIT PERFORMANCE . . . . . . . . . . . . . . 120
CIRCUIT STUCK FORWARD . . . . . . . . . . . . 124
CIRCUIT STUCK REARWARD . . . . . . . . . . . 127
B1D67–ADJUSTABLE PEDAL CONTROL
CIRCUIT PERFORMANCE . . . . . . . . . . . . . . 130
SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . 136
SENSOR SIGNAL ERRATIC
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 143
COMPARATIVE PERFORMANCE . . . . . . . . . 150
SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . 154
SENSOR SIGNAL ERRATIC
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 161
COMPARATIVE PERFORMANCE . . . . . . . . . 168
SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . 172
C1027-LEFT REAR WHEEL SPEED SENSOR
SIGNAL ERRATIC PERFORMANCE . . . . . . . 178
COMPARATIVE PERFORMANCE . . . . . . . . . 186
SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . 190
SENSOR SIGNAL ERRATIC
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 196
COMPARATIVE PERFORMANCE . . . . . . . . . 203
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 207
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 209
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 211
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 213
C1046-LEFT FRONT WHEEL PRESSURE
PHASE MONITORING . . . . . . . . . . . . . . . . . 215
C1047-RIGHT FRONT WHEEL PRESSURE
PHASE MONITORING . . . . . . . . . . . . . . . . . 219
C1048-LEFT REAR WHEEL PRESSURE
PHASE MONITORING . . . . . . . . . . . . . . . . . 223
C1049-RIGHT REAR WHEEL PRESSURE
PHASE MONITORING . . . . . . . . . . . . . . . . . 227
CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 235
CORRELATION . . . . . . . . . . . . . . . . . . . . . . 241
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 244
ERRATIC PERFORMANCE . . . . . . . . . . . . . . 245
DENIED . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
COMPARATIVE PERFORMANCE . . . . . . . . . 266
C1222-BRAKE PEDAL TRAVEL SENSOR/
BRAKE PRESSURE SENSOR
CORRELATION . . . . . . . . . . . . . . . . . . . . . . 274
C122A-BRAKE BOOSTER PEDAL FORCE
SWITCH CIRCUIT . . . . . . . . . . . . . . . . . . . . 282
C122B-BRAKE BOOSTER PEDAL FORCE
SWITCH CIRCUIT PERFORMANCE . . . . . . . 291
CONTROL CIRCUIT SUPPLY VOLTAGE . . . . 300
CONTROL CIRCUIT . . . . . . . . . . . . . . . . . . . 305
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . 310
TOO LONG . . . . . . . . . . . . . . . . . . . . . . . . . 313
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 315
C123C-SENSOR CLUSTER MOUNTING/
INSTALLATION PERFORMANCE . . . . . . . . . 317
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
5 - 107
C2111-SENSOR SUPPLY VOLTAGE CIRCUIT
LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
C2112-SENSOR SUPPLY VOLTAGE CIRCUIT
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
VOLTAGE LOW . . . . . . . . . . . . . . . . . . . . . . 335
VOLTAGE HIGH . . . . . . . . . . . . . . . . . . . . . . 340
C2116-ABS PUMP MOTOR SUPPLY LOW
VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
INTERNAL . . . . . . . . . . . . . . . . . . . . . . . . . . 349
C2202-ORIGINAL VIN MISMATCH/MISSING
INTERNAL . . . . . . . . . . . . . . . . . . . . . . . . . . 362
MISMATCH . . . . . . . . . . . . . . . . . . . . . . . . . 364
U0002-CAN C BUS OFF PERFORMANCE
ECM/PCM . . . . . . . . . . . . . . . . . . . . . . . . . . 372
U0101-LOST COMMUNICATION WITH TCM
U0114-LOST COMMUNICATION WITH FINAL
DRIVE MODULE . . . . . . . . . . . . . . . . . . . . . 378
STEERING ANGLE SENSOR . . . . . . . . . . . . 381
FRONT CONTROL MODULE . . . . . . . . . . . . 384
U0401-IMPLAUSIBLE DATA RECEIVED
FROM ECM/PCM . . . . . . . . . . . . . . . . . . . . . 387
U1003-ESP CAN C BUS PERFORMANCE
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . 394
CONFIGURATION DATA RECEIVED . . . . . . . 399
U1501-IMPLAUSIBLE MESSAGE DATA
LENGTH RECEIVED FROM PCM . . . . . . . . . 401
U1502-IMPLAUSIBLE MESSAGE DATA
LENGTH RECEIVED FROM TCM . . . . . . . . . 403
U1503-IMPLAUSIBLE MESSAGE DATA
LENGTH RECEIVED FROM FCM . . . . . . . . . 405
B1D4F-ADJUSTABLE PEDAL INHIBIT
CIRCUIT LOW . . . . . . . . . . . . . . . . . . . . . . . 408
B1D50-ADJUSTABLE PEDAL INHIBIT
CIRCUIT HIGH . . . . . . . . . . . . . . . . . . . . . . . 412
B1D51-ADJUSTABLE PEDAL INHIBIT
CIRCUIT OPEN . . . . . . . . . . . . . . . . . . . . . . 416
BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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APS-INTERMITTENT CONDITION
For the Adjustable Pedals System circuit diagrams. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
Diagnostic Test
1.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identi-
fying 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 can result in
personal injury or death.
1. Refer to any Technical Service Bulletins (TSBs) that may apply.
2. Review the scan tool information. 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.Perform a voltage drop test on the related circuits between the suspected faulty component and the Memory Seat
Module.
6. Inspect and clean all grounds that are related to the most current DTC.
7. If numerous trouble codes were set, use a wiring schematic and look for any common ground or supply circuits
8. Monitor with the scan tool and wiggle the related wire harness to try to interrupt the actuation.
9. Use the scan tool to perform a System Test if one applies to failing component.
10. 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 APS VERIFICATION TEST VER - 1.
No
>> Test Complete.
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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS
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