C1102

DTC C1102





GENERAL DESCRIPTION
The ABS ECU (Electronic Control Unit) checks the battery voltage to determine, as a safety issue, whether the ABS system can operate normally or not. The normal battery voltage range is essential for controlling the ABS system as intended.

DTC DESCRIPTION
The ABS ECU monitors the battery voltage by reading the value of voltage. When the voltage is lower than the expected normal value, this code is set. The ABS functions are prohibited and the EBD function is allowed on LOW VOLTAGE CONDITION, the ABS/EBD functions are prohibited on UNDER VOLTAGE CONDITION. If the voltage recovers, to within normal operating ranges, then the controller returns to normal operations as well.

DTC DETECTING CONDITION (part 1):

DTC DETECTING CONDITION (part 2):

DTC DETECTING CONDITION (part 3):

TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
^ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
^ Go to "Power Circuit Inspection" procedure.

POWER CIRCUIT INSPECTION
1. Ignition "OFF"
2. Disconnect HECU connector.
3. Ignition "ON"& Engine "OFF".
4. Measure voltage between terminal "4" of the HECU harness connector and chassis ground.
Specification: Approximately B+





5. Is the measured voltage within specifications?
YES
^ Go to "Ground Circuit Inspection" procedure.
NO
^ Check for damaged harness and poor connection between the battery terminal (+) and terminal "4" of the HECU harness connector. Check for blown 10A ABS fuse. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

GROUND CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect HECU connector.
3. Measure resistance between terminal "8, 24 (ESP: 16, 47)" of the HECU harness connector and chassis ground.
Specification: Approximately below 1 Ohms





4. Is the measured resistance within specifications?
YES
^ Go to "Component Inspection" procedure.
NO
^ Check for damaged harness and poor connection between terminal "8, 24 (ESP: 16, 47)" of the HECU harness connector and chassis ground. Repair as necessary and then go to "Verification of vehicle Repair" procedure.

COMPONENT INSPECTION
1. Ignition "OFF".
2. Engine "ON".
3. Does warning lamp remain On?
YES
^ Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
^ Fault is intermittent caused by poor connection in power harness (IGN+) and/or faulty HECU or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect Scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a Scan tool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Are any DTCs present?
YES
^ Go to the applicable troubleshooting procedure.
NO
^ System performing to specification at this time.