ABS-312
J. ABS-311, ABS-312 Wheel sensor signalABS-311 Wheel sensor signal LH front wheel, circuit fault
ABS-312 Wheel sensor signal RH front wheel, circuit fault
JA. DTC information
Condition
If the control module registers that the signal from the wheel signal is absent and there is a break or short circuit in the circuit, then post DTC ABS-311 or ABS-312 is posted depending on the wheel sensor
Substitute value
- ABS/TRACS is disabled.
- EBD system is available.
Possible source
- Break in the signal lead (+) - or signal lead (-)
- Signal lead (+) or signal lead (-) short circuited to ground or current.
- Signal leads short circuited to each other.
- Defective wheel sensor
- Contact resistance in the connections
Fault symptom(s)
- When the ABS system is disabled, there is a risk of the wheel locking when braking.
- In cars with TRACS, the anti-wheelslip system cuts out.
- If there is a fault in both front wheel sensors at the same time, the speed will not be indicated on the instrument panel.
Caution! If the fault becomes intermittent, the ABS warning light will go out once the speed exceeds 20 km/h (12 mph) in the next driving cycle.
JB. Other DTCs, status notifications and status codes
[JB1]
Other DTCs
- Note other DTCs
Select one of the above alternatives to continue
Alternative 1: JB2
Alternative 2: JB3
[JB2]
Status notification
Select one of the following alternatives to continue
Alternative 1: Fault/trace as per JC. Circuit fault. Permanent fault.
Alternative 2: Fault-trace as per JD. Circuit fault. Intermittent fault.
[JB3]
Status check
- Raise the vehicle so that the relevant wheel is off the ground
- Ignition on
- Go into running values, list 1
Note the wheel speed for the wheel in question
Spin the wheel round and check that the speed is updated when the wheel spins round
Is the speed updated for the wheel in question when the wheel spins round ?
Yes: Fault-trace as per JD. Circuit fault. Intermittent fault.
No: Fault-trace as per JC. Circuit fault. Permanent fault.
JC. Circuit fault. Permanent fault
[JC1]
Connect the test box and check the contact points
Connect test box as per [JJJA]. Connect the test box Check Communication to Control Module [III]
Then proceed to: JC2
[JC2]
Check the resistance in the wheel sensor circuit
- Ignition off.
- Control module disconnected.
Connect an ohmmeter between test box:
#4 and #11 (DTC ABS-311).
#3 and #18 (DTC ABS-312).
The ohmmeter should indicate 1040-1160 ohms
If reading is OK: JC12
If reading is incorrect: JC3
[JC3]
Check the resistance in the wheel sensor
- Ignition off
- Remove the wheels for better access
- Clean carefully around the wheel sensor connector. Brush and blow clean
- Disconnect the wheel sensor
Connect an ohmmeter between wheel sensor connector connection:
The ohmmeter should indicate 1040-1160 ohms.
If reading is OK: JC5
If reading is incorrect: JC4
[JC4]
Replace the component
Test with a new wheel sensor as per KKKKA. Front wheel sensor, replacement.
Sensors and Switches - Brakes and Traction Control - Wheel Speed Sensor - Service and Repair - Procedures Service and Repair
Then continue with: JC16
[JC5]
Check the resistance in the signal cable (+)
- Ignition off
- Wheel sensor disconnected
- Control module disconnected
Connect an ohmmeter between wheel sensor connector connection:
2 and #4 on the test box (DTC ABS-311)
2 and #3 on the test box (DTC ABS-312)
The ohmmeter should indicate approx. 0 ohms.
If reading is OK: JC7
If reading is incorrect: JC6
[JC6]
Check for cable breaks
Check the cable between wheel sensor connector connection:
2 and control module #4 (DTC ABS-311)
2 and control module #3 (DTC ABS-312)
for breaks as per [IIIB2]. Check Communication to Control Module [III]
Then continue with: JC16
[JC7]
Check the resistance in the signal cable (-)
- Ignition off.
- Wheel sensor disconnected.
- Control module disconnected.
Connect an ohmmeter between wheel sensor connector connection:
1 and #11 on test box (DTC ABS-311)
1 and #18 on test box (DTC ABS-312)
The ohmmeter should indicate approx. 0 ohms
If reading is OK: JC9
If reading is incorrect: JC8
[JC8]
Check for cable breaks
Check the cable between wheel sensor connector connection:
1 and control module #11 (DTC ABS-311)
1 and control module #18 (DTC ABS-312)
for breaks as per [IIIB2]. Check Communication to Control Module [III]
Then continue with: JC16
[JC9]
Check signal cable (+) resistance to signal cable (-)
- Ignition off
- Wheel sensor disconnected.
- Control module disconnected.
Connect an ohmmeter between test box:
#4 and #11 (DTC ABS-311)
#3 and #18 (DTC ABS-312)
The ohmmeter should indicate approx. 0 ohms.
If reading is OK: JC10
If reading is incorrect: JC11
[JC10]
Check for contact resistance and oxidation
The fault has been caused by poor contact in the wheel sensor connector.
Take appropriate action for contact resistance and oxidation in the wheel sensor connector as per [IIIB5]. Check Communication to Control Module [III]
Then continue with: JC16
[JC11]
Check for short circuiting
Check the leads between the wheel sensor and the control module for short circuiting to each other as per [IIIB4]. Check Communication to Control Module [III]
Then continue with: JC16
[JC12]
Check the signal leads
- Ignition off
- Connect the control module
- Ignition on
Connect a voltmeter between test box:
#8 and #4 (DTC ABS-311)
#8 and #3 (DTC ABS-312)
The voltmeter should indicate approx. 2.3 V.
If reading is OK: JC13
If value is lower: JC14
If value is higher: JC15
[JC13]
Check for contact resistance and oxidation
The fault has been caused by poor contact in the control module connector.
Take appropriate action for contact resistance and oxidation in the control module connector as per [IIIB5]. Check Communication to Control Module [III]
Then continue with: JC16
[JC14]
Check for short circuiting
Check the cable between wheel sensor connector connection:
2 and control module #4 (DTC ABS-311)
2 and control module #11 (DTC ABS-311)
2 and control module #3 (DTC A8S-312)
1 and control module #18 (DTC ABS-312)
for short-circuiting to ground as per [IIIB3]. Check Communication to Control Module [III]
Then continue with: JC16
[JC15]
Check for short circuiting
Check the cable between wheel sensor connector connection:
2 and control module #4 (DTC ABS-311)
1 and control module #11 (DTC ABS-311)
2 and control module #3 (DTC ABS-312)
1 and control module #18 (DTC ABS-312)
for short-circuiting to power as per [IIIB4]. Check Communication to Control Module [III]
Then continue with: JC16
[JC16]
Verification
Hint: After repair it is necessary to check that the fault has been rectified
- Ignition off
- Reconnect the connections, components etc.
- Raise the vehicle so that the wheel is off the ground.
- Ignition on
- Go into running values, list 1.
Note the speed of the wheel in question.
Spin the wheel round and check that the speed is updated when the wheel spins.
Is the speed of the wheel in question updated when it spins round ?
Yes: Fault corrected
No: JC17
[JC17]
Fault-tracing information
The verification result shows that the fault persists. Do you want to exit fault-tracing?
Yes: Fault not corrected
No: JC1
JD. Circuit fault. Intermittentt fault
[JD1]
Check the leads and connections
Check the wheel sensor and control module connectors for contact resistance and oxidation as per [IIIB6]. Check Communication to Control Module [III]
Check the cable between wheel sensor connector connections:
2 and control module #4 (DTC ABS-311)
1 and control module #11 (DTC ABS-311)
2 and control module #3 (DTC ABS-312)
1 and control module #18 (DTC ABS-312)
for intermittent breaks as per [IIIB2], intermittent short circuiting to ground as per [IIIB3] and intermittent short circuiting to power as per [IIIB4]. Check Communication to Control Module [III]
Then continue with: JD2
[JD2]
Test driving
- Ignition on.
- Note the DTC and the status.
- Disconnect Volvo System Tester so that the diagnosis is aborted.
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. Brake so that the wheel sensors are warmed up
- Stop the vehicle.
Note the DTC status
Is the status intermittent?
Yes: JD3
No: JD4
[JD3]
The status is intermittent
The system is OK.
Then continue with: Fault corrected
[JD4]
Replace the component
Test with a new wheel sensor as per KKKKA. Front wheel sensor, replacement.
Sensors and Switches - Brakes and Traction Control - Wheel Speed Sensor - Service and Repair - Procedures Service and Repair
Then continue with: JD5
[JD5]
Fault-tracing information
For intermittent faults, fault/tracing is not followed by a verification because the fault is not present at this moment.
Do you want to repeat fault-tracing?
Yes: JD1
No: Operation done