This code shows in case that the power source for the HECU drops lower than or rises higher than the specified value.
If the power source returns within the specified value, this code will not show any longer.
Before carrying out the following inspection, check and recharge, if necessary, the battery.
DTC No | Condition | Possible Cause |
C1101 (High Voltage) C1102 (Low Voltage) | Hight Voltage: 1. When Vign more than 16±0.5V is continued for 500msec. 2. When Vign more than 19±0.5V is continued for 49msec. 3. if the voltage recover normal operating range, the controller is reset Low Voltage : 1. When Vign less than 9.5V±0.5V is continued for 500msec during Vref more than or equal to 7Km/h. 2. When Vign less than 8.5V±0.5V is continued for 500msec during Vref less than or equal to 7Km/h or ABS, TCS(ESP) control. 3. When Vign less than 7.2V±0.5V is continued for 28msec. 4. If IGN voltage is recovered to normal operating voltage, the system recovers to normal state. | - Open/short in power supply circuit - Faulty power source - Faulty HECU |
High voltage :
The system stops. the ABS, TCS(ESP) and the EBD functions are inhibited. The ABS, TCS(ESP) and the EBD warning lamps are ON. The valve relay and all solenoids are OFF.
Low voltage :
Without the ABS control : inhibit the ABS, TCS(ESP) control of front wheels and allow the ABS control of rear wheels, deactivating the motor, and the ABS, TCS(ESP) warning lamps are switched on. When the voltage recover to the normal operating range, enable ABS function and ABS, TCS(ESP) warning lamps are switched off and erase the error code
With the ABS control : inhibit ABS control of the front wheels and allow ABS control of the rear wheels, deactivating the motor. the ABS, TCS(ESP) warning lamps are directly switched on and the state keeps continuously. the error code is always stored.
CHECK POWER BETWEEN TERMINAL OF HECU CONNECTOR.
Disconnect the connector from the ABS control module, and then turn the ignition switch ON.
Measure the voltage between terminals 4(+) and 8(-) or 24(-) of the HECU connector.
Specification: 9.4~17V
Is the voltage within the specification?
▶Check the HECU connector.If no error is founded, replace the HECU and recheck.
▶Check battery.
CHECK BATTERY.
Measure the voltage between positive(+) and negative(-) terminals of the battery.
Is the voltage below 9.4V?
▶Check and replace the battery.
▶Check circuit for contingtinuty between bettery and HECU.
CHECK CIRCUIT FOR CONTINUITY BETWEEN BATTERY AND HECU.
Check the resistance between terminal 4(+) of the HECU connector and battery positive(+) terminal.
Is the resistance below 1Ω?
▶Repair harness or connector.
▶Check circuit for continuity between the HECU and body ground.
CHECK CIRCUIT FOR CONTINUITY BETWEEN THE HECU AND BODY GROUND.
Measure the resistance between terminals 8(-), 24(-) of the HECU connector and the body ground.
Is the resistance below 1Ω?
▶Check and readjust the installing of the body groud.
▶Check voltage beween the HECU connector.
CHECK VOLTAGE BETWEEN THE HECU CONNECTOR.
Turn the ignition switch ON.
Measure the voltage between terminals 4(+) and 8(-), 24(-) of the HECU connector.
Is the voltage above 17V?
▶Repair and replace, if necessary, the charging system.
▶Repeat the inspection procedure.
