C2112

DTC C2112 VALVE RELAY MAL.

COMPONENT LOCATION:

GENERAL DESCRIPTION
The ABS ECU supplies battery power to all solenoid valves by way of a valve relay which is controlled by the Electronic Control UNIT (ECU). The valve relay and all solenoid valves are installed inside the HECU (Hydraulic and Electronic Control Unit).

DTC DESCRIPTION
ABS ECU monitors voltage of the valve relay to check if ABS ECU can perform ABS control normally. When the valve relay is switched to ON, the HECU will set this code if the solenoid drive voltage is below permissible voltage ranges for a period of time. When the valve relay is switched to OFF, the HECU sets this code if the solenoid drive voltage is over the permissible voltage range for a period of time.

DTC DETECTING CONDITION

DTC DETECTING CONDITION:

TERMINAL & CONNECTOR INSPECTION
Refer to DTC C1101. C1101

POWER SUPPLY CIRCUIT INSPECTION
1. Ignition OFF
2. Disconnect HECU connector.
3. Ignition ON & Engine "OFF".




4. Measure voltage between terminal 3 of the HECU harness connector and chassis ground.
Specification: Approximately B+
Is the measured voltage within specifications?
YES
- Go to Ground Circuit Inspection procedure.
NO
- Check for open or short in power harness between battery terminal(+) and terminal 3 of the HECU harness connector. Check for open or blown 20A 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 4 of the HECU harness connector and chassis ground.
Specification: Approximately below 1 Ohm
Is the measured resistance within specifications?
YES
- Go to Component Inspection procedure.
NO
- Check for damaged harness and poor connection between terminal 4 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".
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 open or short of power harness and/or faulty HECU or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.

VERIFICATION OF VEHICLE REPAIR
Refer to DTC C1101. C1101