C1102

DTC C1102 Battery Voltage Out Of Range (Under-Voltage Fault)

Inspection Procedure
1. CHECK POWER BETWEEN TERMINAL OF HECU CONNECTOR.
1) Disconnect the connector from the ABS control module, and then turn the ignition switch ON.

Voltmeter Connected To HECU:

2) Measure the voltage between terminals 4 (+) and 8 (-) or 24(-) of the HECU connector.
Specification: 9.4 - 17 Volts
Is the voltage within the specification?
YES
- Check the HECU connector. If no error is founded, replace the HECU and recheck.
NO
- Check battery.

2. CHECK BATTERY.
Measure the voltage between positive (+) and negative (-) terminals of the battery.
Is the voltage below 9.4 Volts?
YES
- Check and replace the battery.
NO
- Check circuit for continuity between battery and HECU.

3. 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 1 Ohms?
NO
- Repair harness or connector.
YES
- Check circuit for continuity between the HECU and body ground.

4. CHECK CIRCUIT FOR CONTINUITY BETWEEN THE HECU AND BODY GROUND.

Voltmeter Connected To HECU:

Measure the resistance between terminals 8 (-), 24 (-) of the HECU connector and the body ground.
Is the resistance below 1 Ohm?
NO
- Check and readjust the installing of the body ground.
YES
- Check voltage between the HECU connector.

5. CHECK VOLTAGE BETWEEN THE HECU CONNECTOR.
1) Turn the ignition switch ON.

Voltmeter Connected To HECU:

2) Measure the voltage between terminals 4 (+) and 8 (-), 24 (-) of the HECU connector.
Is the voltage above 17 Volts?
YES
- Repair and replace, if necessary, the charging system.
NO
- Repeat the inspection procedure.