ABS-444
0. ABS-423, ABS-431, ABS-442, ABS-444ABS-423 Inlet valve TRACS, fault in the valve terminal circuit
ABS-431 Control module, general hardware fault
ABS-442 Control module, creeping power
ABS-444 Control module, internal valve reference voltage
OA. DTC information
Condition
DTC ABS-423
If the TRACS inlet valve circuit in the control module is short circuited to ground~current or if there is a break in the circuit, the control module will interpret this as a fault and fault code ABS-423 is posted.
DTCs ABS-431, ABS-444, ABS-442
If the control module registers that there is a break or short circuit in any of the control module's internal circuits DTCs ABS-431, ABS-444 and ABS-442 are posted.
Substitute value
- ABS/TRACS is disabled.
- EBD is disabled.
Possible source
- Interference, noise etc. which disrupts the control module calculations.
- Defective control module.
Fault symptom(s)
- If the ABS/EBD systems are disabled, there is a risk of the wheels (especially the rear wheels) locking when braking.
- In cars with TRACS, the anti-wheelslip system cuts out.
OB. Other DTCs, status notification and status checks
[OB1]
Other DTCs
- Note other DTCs
Select one of the following alternatives to continue
Alternative 1: 0B2
Alternative 2: 0B3
Alternative 3: 0B4
Alternative 4: 0B5
Alternative 5: 0B6
Alternative 6: 0B7
Alternative 7: 0B8
Alternative 8: OB9
[0B2]
Status notification
- ABS-423 ABS-431, ABS-442 and ABS-444.
Select one of the following alternatives to continue
Alternative 1:
Fault-trace as per OC. Permanent fault.
Alternative 2:
Fault-trace as per OD. Intermittent fault.
[0B3]
ABS-423 and ABS-141
Fault-trace as per BC. Circuit fault. Permanent fault. ABS-141
Then continue with: OB10
[0B4]
ABS-423 and ABS-142
Fault-trace as per CC. Incorrect signal Permanent fault. ABS-142
Then continue with: OB10
[0B5]
ABS-423 and ABS-143
Fault-trace as per DC. Circuit fault. Permanent fault. ABS-143
Then continue with: OB10
[0B6]
ABS-423 and ABS-144
Fault-trace as per EB. High temperature. ABS-144
Then continue with: OB10
[0B7]
ABS-431 and ABS-433
Fault-trace as per PC. Battery voltage too high. Permanent fault. ABS-433
Then continue with: OB10
[OB8]
ABS-431 and ABS-443
Fault-trace as per RC. Electrical or mechanical fault. Permanent fault. ABS-443
Then continue with: OB10
[0B9]
ABS-442, ABS-444 and ABS-441
Fault-trace as per NC. Permanent fault. ABS-411
Then continue with: OB10
[OB10]
Status checks
- Disconnect the Volvo System Tester to abort the diagnosis
Warning! The ABS and EBD systems are not available while Volvo Diagnostics is activated. Take great care when test driving as there is a serious risk of the wheels locking when braking
- Test drive the vehicle as per SA. Test driving. Test Driving [SA]
- Note the DTC status
Select one of the following alternatives to continue
Alternative 1: Fault-trace as per OD. Intermittent fault.
Alternative 2: Fault-trace as per OC. Permanent fault.
OC. Permanent fault
[OC1]
Replacing a component
- Ignition off
Test with a new control module MMMM. Control module, replacement.
Relays and Modules - Brakes and Traction Control - Electronic Brake Control Module - Service and Repair - Procedures Service and Repair
Then continue with: Operation done
0D. Intermittent fault
[OD1]
Erasing DTCs
- The control module has previously registered a fault
- Ignition on
Erase the DTC
Then continue with: Operation done