Diags

[dragon]

Became brave and opened my diag box today for the first time - Matbat egged me into it - he said it'd be fun... First mistake is I tried to do it without the ignition on, although interestingly enough you can still read socket 5 like this, but not 3 or 7 (these are the only 3 sockets wired on mine), but then redid the tests with the ignition on, fun? Not sure...

Does anyone know what each socket on the diags represents? I only have sockets 3,5 and 7 wired up on my diag box - 5 I believe to be the fuel codes, but what is socket 3 and what is socket 7? I get 2 scary fault codes from socket 3 (4-4-4 - acceleration sensor signal and 1-4-2 - ecu faulty), 1 fault code from socket 5 (4-5-2 misfire on cylinder 2) and the all clear (1-1-1) on socket 7

the ecu faulty worries me slightly (ok, a LOT) - could it be that one or more of my current mods is making it _think_ the ECU is faulty - Dave, care to comment? Jamo - have you got any of these errors on yours?

I suddenly wish the diags were more specific than they are now....

hmmmmm

[Michael 480T]

socket 3 is the ABS Mark IV and socket 5 is the CEM III
your socket 3 errors mean:
4-4-4: keine zufuhr zum ventilregelkreis
no idea what's this in english, maybe someone else can translate it
ventil == valve, regelkreis == control circuit
maybe something like: no input to the valve control circuit

1-4-2: Bremslichtschalter, offener stromkreis oder kurzschluss
open circuit or short circuit at the breakpedalswitch

the error at socket 5 is no problem, every 480 after a certain VIN has it.

I don't really know, what socket 7 is for and at last: you cannot get the errorcodes from the Turbo-ECU. this only works with non-turbomodels

[dbsvolvos]

this is what it meant

no supply to the valve rule circle , what that means i can only guess

[dragon]

OK, as it seems the diags have many functions, I basically followed the instructions at this site: http://www.troublecodes.net/Volvo except where it says socket 2, I used 5 and then I repeated the same instructions with sockets 3 and 7

[dragon]

Ben Harris has helped me understand that I was using the box wrong and therefore misinterpreted the results, so I'm a happier bunny now

[Ben Harris]

CEM : 1-4-2 This fault code indicates that the wiring of the brake light switch is interrupted or short circuited.

CEM : 4-5-2 Start interlock.

ABS : 4-4-4 Fault code 4–4–4 indicates a fault or an interruption in the power supply to the valve coils.


On 480 models from chassis number 573100 onwards, fault code 4-5-2 may appear during a diagnostic readout of the CEM.

This is caused by a new type of starter motor. This starter motor has permanent magnets which cause a voltage to be generated when the engine is switched off. The diagnostic system interprets this voltage as a fault.

If fault code 4–5–2 appears, it can be erased straightaway after all the other codes have been read out of the memory.

Ben.

[pol]

Ahhh, thanks for that bit on 4-5-2 ben... That makes my car ok probably then! Maybe..

Anyway, I find this site useful now I understand how to use the codes, posted by someone who i forget (sorry) from the old ezboard...
I printed them off and stuck a copy in the glove box. I only have socket 5 on mine.

http://www.troublecodes.net/Volvo/
(ummm... didn't see you'd already posted that... well now it's there twice)

pol

[480-Pelle]

Ahhh, thanks for that bit on 4-5-2 ben... That makes my car ok probably then! Maybe..

Anyway, I find this site useful now I understand how to use the codes, posted by someone who i forget (sorry) from the old ezboard...
I printed them off and stuck a copy in the glove box. I only have socket 5 on mine.

http://www.troublecodes.net/Volvo/
(ummm... didn't see you'd already posted that... well now it's there twice)

pol

Great, now I got my 4-5-2 sorted too!
Except that, there was no faultcodes last time I checked.

Nice.

Me too only have socket 5.

//Pelle

[Ben Harris]

I would imagine you only get socket 3 if you have a MKIV ABS controller (the one in the engine bay, rather than the boot). The MK4 ABS controller was introduced in the '93 model car.

If you've got a pre-93 model, with a MKII ABS controller (the one in the boot), you can still read the diagnostic codes, via the ABS light on the dashboard. Instructions for doing so are:

Preliminary operations
Electronic faults in the ABS are stored in and can be read out of the memory of the Electronic Control Unit.
Note! As soon as a fault occurs in the ABS, this is indicated by the ABS warning lamp in the instrument panel.
Release the diagnostic plug. This is located near the Electronic Control Unit.

ABS warning lamp during normal operation of the ABS
When the ignition is switched on, the ABS warning lamp lights up and remains on for two seconds.
If there is no hydraulic pressure present in the brake system, the ABS warning lamp will remain on for up to 30 seconds.
Switch the ignition off and then back on again. The ABS warning lamp will light up for two seconds. During this two second period the ECU will automatically test the hydraulic unit, the brake fluid level and the hydraulic pressure. This can be noted by a fluctuation in the light–emitting intensity of the ABS warning lamp.

Reading the flash code
The flash code is divided into seven main groups, most of which are further subdivided.
The system stores the faults in its memory and prioritizes them during the readout.
Read the flash code out of the memory with the vehicle stationary. Apply the handbrake (the wheels must not be turned and the brake pedal must not be depressed!).

Preliminary operations before reading the flash code
Required tools: a small piece of cable for making a bridge.
Switch off the ignition.
Disconnect the 3–pole connector from the wiring harness and bridge the brown and white/green cables.

Reading the flash code
Switch on the ignition.
The ABS warning lamp lights up and remains on for 4 seconds.
Then the first flash code is given (make a note of this), followed by a two second pause.
The second flash code is then given (make a note of this). Do not count the last flash of the lamp, otherwise an incorrect flash code will be noted.
Always check whether there are any other faults stored in the memory.
Readout of several faults
By briefly interrupting the bridge it is possible to check whether any other flash codes are stored in the memory. When the ABS warning lamp remains on without flashing, this indicates that there are no more flash codes (faults) present in the system.
Not all faults in the hydraulic control system (brake fluid level indicator, pressure warning switch) are stored in the memory. Consequently, they cannot be read out of the memory in the form of a flash code. If the fault cannot be located in these parts, there may be a fault in the ECU.
Note the DTCs which were read out.

[dragon]

I reckon Ben Harris spends too much time reading VADIS! I'm bveginning to think he's neglecting some nice girl somewhere and it's MY FAULT... mmmmmmm

[Ben Harris]

... and here's what the fault codes mean (for a MKII)

1-1 Tension
Too high tension

1-2 Electronic Control Unit
Fault in Control Unit

2-1 Main valve
2-2 Inlet valve to LH front wheel
2-3 Outlet valve to LH front wheel
2-4 Inlet valve to RH front wheel
2-5 Outlet valve to RH front wheel
2-6 Inlet valve to rear wheel
2-7 Outlet valve to rear wheel
Signal faulty

3-1 LH front wheel sensor
3-2 RH front wheel sensor
3-3 RH rear wheel sensor
3-4 LH rear wheel sensor
Signal missing

3-5 LH front wheel sensor
3-6 RH front wheel sensor
3-7 RH rear wheel sensor
3-8 LH rear wheel sensor
Signal faulty at speeds over 40km/hour

4-1 LH front wheel sensor
4-2 RH front wheel sensor
4-3 RH rear wheel sensor
4-4 LH rear wheel sensor
Faulty wheel speed signal

4-5 Wheel sensors
4-6 RH front, RH rear and LH rear wheel sensor
4-7 RH rear and LH rear wheel sensor
4-8 Wheel sensors
Signal faulty from at least two wheel sensors

5-1 Outlet valve to LH front wheel
5-2 Outlet valve to RH front wheel
5-3 Outlet valve to RH rear wheel
5-4 Outlet valve to LH rear wheel
Faulty signal

5-5 LH front wheel sensor
5-6 RH front wheel sensor
5-7 RH rear wheel sensor
5-8 LH rear wheel sensor
Faulty signal

6-1 Hydraulic Control System
Signal faulty from fluid level and pressure warning switch

7-1 LH front wheel sensor
7-2 RH front wheel sensor
7-3 RH rear wheel sensor
7-4 LH rear wheel sensor
Signal faulty, earth faults

7-5 LH front wheel sensor
7-6 RH front wheel sensor
7-7 RH rear wheel sensor
7-8 LH rear wheel sensor
Faulty wheel speed signal

[Ben Harris]

I reckon Ben Harris spends too much time reading VADIS! I'm bveginning to think he's neglecting some nice girl somewhere and it's MY FAULT... mmmmmmm

I don't have a nice girl at the moment to neglect Don't worry though - tomorrow evening will be spent down the pub making up for it!

Ben.

[dragon]

But you're very useful for it

[Ben Harris]

... and just so the MKIV ABS Controller people don't feel left out:

1-2-1 Front-left wheel sensor
1-2-2 Front-right wheel sensor
1-2-3 Rear-left wheel sensor
1-2-4 Rear-right wheel sensor
There is electromagnetic interference in the electric circuit of wheel speed sensor in question at vehicle speeds below 40 km/h.

1-4-1 Pedal sensor
The brake pedal travel sensor is short circuited to the battery or earth.

1-4-2 Brake light switch
The wiring of the brake light switch is interrupted or short circuited.

1-4-3 Electronic Control Unit
There is a fault in the ECU.

2-1-1 Front-left wheel sensor
2-1-2 Front-right wheel sensor
2-1-3 Rear-left wheel sensor
2-1-4 Rear-right wheel sensor
No signal from wheel speed sensor, electric circuit of wheel is not interrupted.
No signal on moving off

2-2-1 Front-left wheel sensor
2-2-2 Front-right wheel sensor
2-2-3 Rear-left wheel sensor
2-2-4 Rear-right wheel sensor
No signal from wheel speed sensor, electric circuit of wheel is not interrupted.
No signal from ABS system

3-1-1 Front-left wheel sensor
3-1-2 Front-right wheel sensor
3-1-3 Rear-left wheel sensor
3-1-4 Rear-right wheel sensor
Short circuit or interruption in electric circuit of wheel speed sensor in question.

3-2-1 Front-left wheel sensor
3-2-2 Front-right wheel sensor
3-2-3 Rear-left wheel sensor
3-2-4 Rear-right wheel sensor
Electromagnetic interference in electric circuit of wheel speed sensor in question at vehicle speeds above 40 km/h.

4-1-1 Inlet valve to left front wheel
4-1-2 Outlet valve to left front wheel
4-1-3 Inlet valve to right front wheel
4-1-4 Outlet valve to right front wheel
4-2-1 Inlet valve to left rear wheel
4-2-2 Outlet valve to left rear wheel
4-2-3 TRACS valve 1
4-3-1 Inlet valve to right rear wheel
4-3-2 Outlet valve to right rear wheel
4-3-3 TRACS valve 2
The connector of the solenoid type hydraulic valve or the trigger transistor that valve is interrupted or short circuited.

4-4-1 Electronic Control Unit
There is a fault in the ECU.

4-4-2 Hydraulic Pump
The pump pressure is too low.

4-4-3 Pump motor
The Electronic Control Unit energizes the pump motor relay and detects that the voltage across terminals 21 and 8 of the rotary sensor is not at least 500 mV/AC. The Electronic Control Unit will store this situation in its memory as a fault:
1.in ABS mode or TRACS mode or during an automatic diagnostic routine if the vehicle speed is faster than 20 km/h,
2.if the pump motor continues to operate without interruption.

4-4-4 Hydraulic Motor
There is a fault or an interruption in the power supply to the valve coils.

[coyote1980]

Great Ben!

Think I better put this in a FAQ with flash codes for the 480