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How to use the On-Board Diagnostic (OBD) unit.

Discussion and advice for 440, 460, 480 owners.
1986 - 1997 440
1986 - 1997 460
1986 - 1997 480
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billofdurham
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Year and Model: 855, 1995
Location: Durham, England
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Re: How to use the On-Board Diagnostic (OBD) unit.

Post by billofdurham » Sun Nov 14, 2010 3:39 pm

My LED tester is home made - a LED, two wires and two probes which will also plug into small crocodile clips.

Bill.
Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.

cornish4475
Posts: 12
Joined: Wed Oct 27, 2010 11:55 am
Year and Model: 440 GLT Turbo A '95
Location: Truro, Cornwall

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by cornish4475 » Wed Nov 17, 2010 11:50 am

Hi again!

Managed to borrow an led continuity and voltage tester.
Ok, if i disconnect all 4 injector plugs, i get 9ish volts through each of them with the ignition on, if i then reconnect one or more of any of the plugs to any injector the voltage disappears and i get continuity instead.
On cranking the 12volt led flashes on all 4 injector wires.
I'm right on the edge of biting the bullet and buying 4 new injectors anyway, if it turns out to be something else i wouldn't mind having good spare parts in my garage just in case.
Rob

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billofdurham
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Joined: Thu Feb 02, 2006 3:31 pm
Year and Model: 855, 1995
Location: Durham, England
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Re: How to use the On-Board Diagnostic (OBD) unit.

Post by billofdurham » Thu Nov 18, 2010 12:53 pm

If you are working on volts on your meter you can't get continuity. That is an ohm reading. If it is showing '0' on volts you have no voltage.

Bill.
Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.

cornish4475
Posts: 12
Joined: Wed Oct 27, 2010 11:55 am
Year and Model: 440 GLT Turbo A '95
Location: Truro, Cornwall

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by cornish4475 » Fri Nov 19, 2010 10:37 am

It's not a digital tester, just a row of led's for voltage, then a seperate one on one side for continuity.

The 9v led lights when the plugs aren't connected, then when i plug a connector in, the voltage led's go out, and the continuity led lights, and the tester emits a continuous beep.
I've given up now though, it's in the garage on monday morning for them to try.
Thanks for all your help Bill, i'll keep posting updates.
Rob

cornish4475
Posts: 12
Joined: Wed Oct 27, 2010 11:55 am
Year and Model: 440 GLT Turbo A '95
Location: Truro, Cornwall

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by cornish4475 » Tue Nov 23, 2010 1:37 pm

I didn't have much luck at the garage, but a local scrapyard had a 440 turbo, so i had most of the fuel injection system.
The new ecu went in first, which cured the problem up. It now runs perfect.
Thanks for your help Bill,

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billofdurham
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Year and Model: 855, 1995
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Re: How to use the On-Board Diagnostic (OBD) unit.

Post by billofdurham » Tue Nov 23, 2010 3:10 pm

Good to know you have it sorted. Thank you for the update.

I have amended the OBD instructions. Thank you for that input.

Bill.
Work was good - retirement is better.

1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.

adi 2727
Posts: 7
Joined: Thu Dec 11, 2008 12:35 pm
Year and Model: 440, 1.9td, 1996
Location: Transilvania

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by adi 2727 » Fri Sep 07, 2012 1:44 pm


dagajsek
Posts: 1
Joined: Wed Jan 08, 2014 1:16 pm
Year and Model: 460, 1994
Location: Slovenia

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by dagajsek » Wed Jan 08, 2014 1:32 pm

Hello! I will borrow this post to ask for help.

I own a B18FT engine, fitted into a renewed R5, now in the middle of resoldering all the wires to fit a smaller car. I plan to use all the Volvo stuff, with electronic speedo. Engine came from a beaten up 460 Turbo, made in 1994, had AC and ABS.

I bumped into a problem regarding OBD box. I can not find any good description of how components are fitted for box to work.
I could only use sockets 3 and 7 (only ones with wires fitted) and am now very much lost, because I took loom apart in intervals and now can't figure out where to wires go. Also some online manuals are totally confusing me.
Image
So, top ones are probably ground and + from junction box, but from here on I am lost. On nr.3 the cable went into a cabin and I think goes to Jetronic, because I found a cable of the same colour. for the wire on socket 7 I've got no idea where it went before, I have a suspicion that it was directed to the speedo, but again, not certain :) What do you think, is the diag box conected to Jetronic? what could be the black wire on nr. 7?

Image


what are those cables separated by plugs? I saw they are test points for led lights, but does someone know where are they going? On my loom I only have one, brown-gray coloured wire, that goes to Jetronic computer and one of the same colour, that goes to EZ210. The one that goes to EZ was once cut off, I can not recall when and why, not even if that was my job :)
Because i have one spare of the same colour, is it possible that Jetronic and EZ share that same cable, so are connected through it? Are those the diagnostic test points, reffered in terminal conections list ? Are those the wires for tests with LED? Where are they soldered to on the other end?
The spare loom, that i took for taking some broken connectors off, has two of such wires, one brown and one blue-brown. I think that loom is older than mine. So it could be without OBD box and that's why there are two of those?

Image

thank you very much for help!!! It is much appreciated!

regards,
Damian, Slovenia

glasgowjim
Posts: 1
Joined: Mon Mar 17, 2014 3:47 pm
Year and Model: 480 es 1992
Location: glasgow

Re: How to use the On-Board Diagnostic (OBD) unit.

Post by glasgowjim » Mon Mar 17, 2014 3:57 pm

Fault Codes Retrieval

1. Open the diagnostic system's box cover and place the test cable mounted on the side of the box into an appropriate socket.
2. Turn the ignition ON to key position II without starting the engine. Wait about ten seconds.
3. Press the button once and hold it for more than one but less than three seconds.
4. The LED lamp will flash in successive series of three digits followed by a three-second pause. If there are no fault codes stored, it will flash 1-1-1 indicating the system being tested is operating correctly.
5. Count the successive flashes and record the fault code.
6. Press the button again, as described above.
7. Record the fault code. If it is the same as the previous one, then no additional codes are stored. Repeat until all the codes stored are retrieved (often a maximum of three).
8. Turn the ignition OFF and remove the test cable from a socket.

Erasing Fault Codes

1. Repeat step 1 and read all the fault codes again. Do not turn the ignition OFF after read-out.
2. Press and hold the button for more than five seconds, then release it.
3. When the LED lights, press the button again for more than five seconds and release it. When the LED goes off, the memory is cleared.
4. Test that memory is cleared by performing step 1. Code 1-1-1 should be returned.
Note: erasing fault codes on the ABS socket will cause the ABS control to be lit. It will turn off after a test-drive with speed of more than 40 km/h.

Sockets Description

1 – alarm and remote locking system,
2 – fuel system,
3 – ABS,
6 – cruise control,
7 – SRS (airbag).

Hints

Before assuming a fault in any of the systems tested, try to erase fault codes as described above. In my case, open circuit in ABS wiring has initially been signalled with codes 122, 152, 312 and 322. After erasing and performing a test-drive, only code 312 was signalled.

At first, read the codes when the engine is completely cold. Then, go for a longer test-drive and read them all again while the engine is still hot. Some codes (especially these related to lambda-sensor) tend to appear only while the vehicle is driven and short time afterwards.
 
Socket 1 — Alarm and remote locking system
Code:
1-1-1 No error code set
1-1-3 Transmitter to receiver: weak signal
1-1-4 Control Module (CM) faulty
2-1-1 Relay contacts, fuse or ground terminal (locking)
2-1-2 Relay contacts, fuse or ground terminal (unlocking)
2-2-1 Fuse or ground terminal (locking)
2-2-2 Fuse or ground terminal (unlocking)
2-2-3 Codes 2-2-1 and 2-2-2 combined
3-1-2 Siren: internal fault
3-2-1 Siren: power supply
4-1-2 Ultrasonic system: internal fault
4-1-3 Ultrasonic system: one or more sensors faulty
5-1-1 Key switch ground on (> 10 seconds)
5-1-2 Key switch ground off (> 10 seconds)
5-1-3 Locking door with ignition on
5-1-4 Unlocking door with ignition on
5-2-1 Central locking system switch (> 10 seconds locked)
5-2-2 Ultrasonic switch (> 20 seconds locked)
5-3-1 Interior lights, shorting to earth

 
Socket 2 — fuel system
Code:
1-1-1 No error code set
1-1-2 Malfunction in Electronic Control Module
1-1-3 Open circuit in injector wiring
1-2-1 Air pressure sensor: no signal correspondence
1-2-2 Air temperature sensor: no signal or signal faulty
1-2-3 Coolant temperature sensor: no signal or signal faulty
1-3-2 Incorrect battery voltage
1-4-3 Knock sensor: no signal or signal faulty
2-1-2 Oxygen sensor: no signal or signal faulty
2-1-4 Flywheel sensor: signal faulty
2-2-2 System relay coil: no voltage
2-2-3 Idle speed regulating valve: no signal or signal faulty
2-3-1 Adaptive Lambda closed loop control system lean or rich in part–load range
2-3-2 Adaptive Lambda closed loop control system lean or rich at idling speed
2-4-4 Knock sensor: no signal or signal faulty
3-1-1 Speedometer signal: no signal correspondence
3-1-3 Charcoal absorption canister valve: signal faulty
3-4-2 A/C relay signal: signal faulty
3-4-3 Main relay coil: no voltage
4-1-1 Throttle valve sensor: signal faulty

 
Socket 3 — ABS
Code: (40 km/h = 25 mph)
1-1-1 No error code set
1-2-1 Left side front wheel sensor: faulty signal at speed less than 40 km/h
1-2-2 Right side front wheel sensor: faulty signal at speed less than 40 km/h
1-2-3 Left side rear wheel sensor: faulty signal at speed less than 40 km/h
1-2-4 Right side rear wheel sensor: faulty signal at speed less than 40 km/h
1-2-5 Signal faulty from at least one sensor for a long period
1-3-5 Control Module (CM) faulty
1-4-1 Faulty pedal sensor: shorted to ground or supply
1-4-2 Faulty stop (brake) lamp switch: open circuit
1-4-3 Control Module (CM) faulty
1-4-4 Brake discs overheated
1-5-1 Left side front wheel sensor: open circuit or short-circuit to battery voltage
1-5-2 Right side front wheel sensor: open circuit or short-circuit to battery voltage
1-5-5 Rear axle sensor: open curcuit or short-circuit to battery voltage
2-1-1 Left side front wheel sensor: no signal or moving off
2-1-2 Right side front wheel sensor: no signal or moving off
2-1-3 Left side rear wheel sensor: no signal or moving off
2-1-4 Right side rear wheel sensor: no signal or moving off
2-1-5 Valve relay: open circuit or short-circuit
2-2-1 Left side front wheel sensor: ABS operation signal missing
2-2-2 Right side front wheel sensor: ABS operation signal missing
2-2-3 Left side rear wheel sensor: ABS operation signal missing
2-2-4 Right side rear wheel sensor: ABS operation signal missing
2-3-1 Left side front wheel sensor: signal missing
2-3-2 Right side front wheel sensor: signal missing
2-3-5 Rear axle sensor: signal missing
3-1-1 Left side front wheel sensor: open circuit or short-circuit
3-1-2 Right side front wheel sensor: open circuit or short-circuit
3-1-3 Left side rear wheel sensor: open circuit or short-circuit
3-1-4 Right side rear wheel sensor: open circuit or short-circuit
3-2-1 Left side front wheel sensor: irregular interference at speeds over 40 km/h
3-2-2 Right side front wheel sensor: irregular interference at speeds over 40 km/h
3-2-3 Left side rear wheel sensor: irregular interference at speeds over 40 km/h
3-2-4 Right side rear wheel sensor: irregular interference at speeds over 40 km/h
4-1-1 Left side front wheel inlet valve: open circuit or short-circuit
4-1-2 Left front return valve: open circuit or short-circuit
4-1-3 Right side front wheel inlet valve: open circuit or short-circuit
4-1-4 Right front return valve: open circuit or short-circuit
4-1-5 Rear valve: open circuit or short-circuit
4-2-1 Rear wheel circuit inlet valve: open circuit or short-circuit
4-2-2 Rear wheel circuit return valve: open circuit or short-circuit
4-2-3 Traction Control System (TRACS) valve: open circuit or short-circuit
4-2-4 Pressure switch for TRACS: faulty or short-circuit
4-4-1 Control Module (CM) faulty
4-4-2 Pump pressure low
4-4-3 Pump motor/relay: electrical or mechanical fault
4-4-4 No power supply to valves in hydraulic unit




Socket 6 — cruise control
Code: (40 km/h = 25 mph)
1-1-1 No error code set; speed was higher than 40 km/h
1-1-2 Vehicle Speed Sensor: abnormal signal received
1-2-2 Vehicle speed: 40 km/h not exceeded or no signal
2-1-1 Fault in supply voltage or Control Module
2-1-2 Circuit to vacuum pump or regulator: signal faulty

Important: cruise control diagnostics must be done immediately after the test drive. Do not turn the engine off! Codes will not be saved in memory if you do.
 
Socket 7 — SRS (airbag)
Code:
1-1-1 No error code set
1-1-2 Internal fault in the sensor unit
1-2-7 SRS warning lamp: open circuit or short-circuit
2-1-1 Steering wheel module: short-circuit in wiring
2-1-2 Steering wheel module: open circuit in wiring
2-1-3 Steering wheel module: short-circuit to the ground
2-1-4 Steering wheel module: short-circuit to +12V
2-2-1 Passenger module: short-circuit in wiring
2-2-2 Passenger module: open circuit in wiring
2-2-3 Passenger module: short-circuit to the ground
2-2-4 Passenger module: short-circuit to +12V
2-3-1 Left seat belt tensioner: short-circuit in wiring
2-3-2 Left seat belt tensioner: open circuit in wiring
2-3-3 Left seat belt tensioner: short-circuit to the ground
2-3-4 Left seat belt tensioner: short-circuit to +12V
2-4-1 Right seat belt tensioner: short-circuit in wiring
2-4-2 Right seat belt tensioner: open circuit in wiring
2-4-3 Right seat belt tensioner: short-circuit to the ground
2-4-4 Right seat belt tensioner: short-circuit to +12V
(no code) SRS warning lamp in the instrument panel does not light
(no code) Fault in diagnostic output



Thanks to: http://www.am.torun.pl/~ja/volvo/diagno ... stem.shtml

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