Jump to content
Volvospeed Forums

Abs Codes Galore


WhiteT5

Recommended Posts

K, so here are the codes pulled out of the ABS socket.

4-4-4 - Hydraulic Unit

1-4-2 - brake light swith

1-4-1 - brake pedal position sensor or something like that

2-1-3 - wheel sensor

2-1-4 - wheel sensor

4-1-2 - Return valve left front wheel

The 1-4-1 and 1-4-2 are not new. Those have been coming back for a long time. I replaced and adjusted the brake light switch and it still didn't stop the codes from coming back on that. The 4-1-2, 4-4-4, along with the 2-1-3 and 2-1-4 (each rear wheel sensor) coming up at the same time does have me a bit worried. I've never gotten wheel sensor codes before, so it seems kinda weird that they should both be coming up at the same time. Ideas? Where to start looking?

'95 850 Turbo - 120k miles

Link to comment
Share on other sites

Below should help you troubleshoot. Replace the pedal sensor and brake light switch unless you want to try repairing them again. Did you cause the front wheels to spin while the rears were stationary resulting in 2-1-3 and 2-1-4 such a spinning the front wheels on ice? For 4-1-2 and 4-1-4, try cleaning the connections first.

DTC information 1–4–1

Condition

If control unit finds that pedal sensor circuit:

-is shorted to ground or supply.

-has an open circuit in the circuit.

-is giving a faulty signal. it posts DTC 1–4–1

Substitute value

ABS/TRACS cutting out.

Possible source

-Signal lead shorted to ground or supply

-Open circuit in ground or signal lead

-Ground and signal lead shorted to one another

-Faulty pedal sensor

-Contact resistance in terminals

-----------------------------------------------------

DTC information 1–4–2

Condition

If the control module finds that the signal from the brake light switch is missing if pedal sensor leaves position 2, it posts DTC 1–4–2.

Substitute value

None.

Possible source

-Signal lead short circuited to ground.

-Open circuit in signal lead.

-Faulty brake light switch.

-Brake light switch adjustment changed.

-Contact resistance in terminals.

-----------------------------------------------------

DTC information 1–2–X, 2–1–X, 2–2–X, 3–2–X (e.g. 2-1-3, 2-1-4)

Condition

DTC 1–2–X.

If the control module finds signals from wheel sensors are subject to electromagnetic interference, are varying too much or are subject to short intermittent open/short circuits at speeds below 40 km/h (25 mph), it posts DTC 1–2–1, 1–2–2, 1–2–3 or 1–2–4, depending on which wheel sensor is involved.

DTC 2–1–X.

If the control module finds there is no wheel sensor signal on moving off from speeds under 6 km/h (4 mph), or if the slowest wheel is turning at a speed less than 60 % of the fastest wheel, but still finds that the circuit is unbroken, it posts DTC 2–1–1, 2–1–2, 2–1–3 or 2–1–4, depending on which wheel sensor is involved.

DTC 2–2–X.

If the control module finds from the wheel sensors that a wheel has not moved (signal stops) for up to 28 seconds (exact time depends on driving conditions) while driving or while ABS is in operation, it posts DTC 2–2–1, 3–2–2, 3–2–3 or 3–2–4, depending on which wheel sensor is involved (assumes that the wheel sensor circuit is unbroken).

DTC 3–2–X.

If the control module finds that the signal from the wheel sensor is affected by electromagnetic interference, is varying too much or is subject to short intermittent open/short circuits at speeds over 40 km/h (25 mph), it posts DTC 3–2–1, 3–2–2, 3–2–3 or 3–2–4, depending on which wheel sensor is involved.

Substitute value

ABS/TRACS switched out. For DTC 1–2–X, the ABS system is disabled at speeds up to 40 km/h (25 mph). The ABS warning indicator only comes on at speeds over 20 km/h (12 mph).

With DTCs 1–2–1 and 1–2–2, the ABS system is only disabled on the front wheels if the speed is below 40 km/h (25 mph). The ABS system cuts in as soon as the fault disappears. The ABS system cuts out completely at speeds over 40 km/h (25 mph).

Possible source

-Loose contacts in leads/joints.

-Lead insulation damaged.

-Contact resistance in connectors.

-Ground and signal leads are too near a source of interference.

-Wheel sensor loose.

-Wheel sensor faulty.

-Pulse wheel faulty.

-Some wheel was locked while driving.

-Play in wheel bearings or axle vibration.

-Hydraulic unit faulty.

Note! With the ignition on, DTCs may be posted if the car is jacked up or if one or more wheels are turned fast enough. Sources of faults of this kind are not included in faulttracing.

-----------------------------------------------------

DTC information 4–1–X, 4–2–1, 4–2–2, 4–2–3 (e.g. 4-1-2)

Condition

If solenoid valve circuit in hydraulic unit is short– circuited to ground/supply or if there is an open circuit in the circuit, the control module will interpret this as a fault and post a DTC for the valve concerned.

Substitute value

ABS / TRACS cut out.

Possible source

-Signal lead short–circuited to ground or supply.

-Open circuit in signal lead.

-Faulty solenoid valve (hydraulic unit).

-Contact resistance in terminals.

-----------------------------------------------------

DTC information 4–4–4

Condition

When the ignition is switched on, control module #33 and #53 is supplied with power. Then #3 records the supply, which means that the power supply to the solenoid valves is OK. If the control module does not detect any supply at #3, it posts DTC 4–4–4.

Substitute value

ABS/TRACS cuts out.

Possible source

-Open circuit in lead for reference supply to control module #3 or short–circuited to ground.

-Open circuit in power supply to hydraulic unit solenoid valves from combination relay (terminal 9).

-Open circuit in power supply to combination relay (terminal 4).

-Open circuit in signal lead (terminal 12 on combination relay) to combination relay main relay.

-Signal lead (terminal 12 on combination relay) to combination relay main relay, short–circuited to supply.

-Open circuit in power supply to combination relay main relay (terminal 3 on combination relay).

-Power supply to control module from combination relay (terminal 10), short–circuited to ground.

-Faulty combination relay.

-Faulty hydraulic unit.

-Contact resistance in terminals.

Link to comment
Share on other sites

  • 4 weeks later...

K, so here are the codes pulled out of the ABS socket.

4-4-4 - Hydraulic Unit

1-4-2 - brake light swith

1-4-1 - brake pedal position sensor or something like that

2-1-3 - wheel sensor

2-1-4 - wheel sensor

4-1-2 - Return valve left front wheel

did you use a special device to retrieve the codes, what is it? My ABS light is on from previous owner and I am trying to get to the problem..Thx

Link to comment
Share on other sites

K, so here are the codes pulled out of the ABS socket.

4-4-4 - Hydraulic Unit

1-4-2 - brake light swith

1-4-1 - brake pedal position sensor or something like that

2-1-3 - wheel sensor

2-1-4 - wheel sensor

4-1-2 - Return valve left front wheel

did you use a special device to retrieve the codes, what is it? My ABS light is on from previous owner and I am trying to get to the problem..Thx

No special device if you have a 95 or earlier model.

Link to comment
Share on other sites

Guest Guest_gspn_*

No special device if you have a 95 or earlier model.

Where exactly do you pull ABS codes from? Im assuming its not from the OBD connector underneath the coin holder inside the car. If you dont need a special device, can you use the same OBD reader you use to pull codes from inside OBD connector?

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...