Ok so I know there is something off on the injection system on my 85 Turbo 760 (bad idle etc), and I know the Motronic computer should have an idea of what's wrong in the system, the only problem is getting that info out of the computer.

I know all the later model units have the flash codes etc, but does anyone know how to get the info I want out of the early Motronic units?

I was hoping I could do it all myself, but without a $1000 interface I'm not so sure I'm going to have any luck, and I wanted to avoid having to take the car to a $70 and hour specialist.

I'm surprised no one has ever come up with a cable and computer program you can use on your home computer to do all this.
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Veronica, my 85 760Ti

What market was your car built for? US and Canadian spec Volvos didn't get a Motronic setup until the 960.

In fact the 85-89 (or so) Turbos got LH-Jetronic 2.2, which has no provision for storing codes.

If you're having trouble with a rough idle, check for any cracks in the intake or vaccum hoses. If you've got the occasional high idle, pull the idle control motor and run some carb cleaner thru it. Make sure that the hoses are okay, and then reconnect everything. On mine (the B230FT has a much different intake manifold from mine) the idle motor is bolted onto the bottom of the intake manifold. Ugh. Remove two bolts and it'll fall out, but you've got to dislodge the manifold first.

- alex

'85 244 Turbo
'84 245 Turbo

It's an Australian spec car, with the B230ET engine, same as the UK market as far as I know.
I beleive all the early cars (84-85) with the B230ET, got the early Motronic system, it combined all ignition/fuel injection and idle control into the one unit, it was suposed to be quite a good system.

The 2.2 is like the Motronic but with seperate ignition/idle control, i don't know about being able to store codes, but like the Motronic it has the ability to be able to list system faults when hooked up to a service computer.

People often don't realise that all the electronic Bosch systems did have some way of checking for faults, it's just that some are harder than others to get info out of.
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Veronica, my 85 760Ti

Alex Z is correct. The LH 2.2 can't be read for fault codes. That capacity was not added to the US cars until the LH 2.4.

Without any symptoms to work with, I would suggest that you check the various inputs for the ECU. Of course I'm not sure where you'd find specs for the sensors.

However, checking the fault codes is one of the last things I'd want to do. Of course I'm used to the insane "everything is vacuum controled" mentality of the K-Jetronic fuel injection.

- alex

'85 244 Turbo
'84 245 Turbo

Actualy I was doing some more reading today, none of the early systems had anything that will log codes or dectect problems as such, so you are right there.
But faults can still be detected via the computers on these early models, the fault reading/checking function is part of the service computer, when it gets hooked up to the computer on your car it fully checks out the system and can tell you what is wrong with the car, it tests every part of the system.

It's interesting because later computers must basicly have part of the service computers functions built into them, meaning all the later service computers needed later on was a reader of some sort.

Of course on teh down side this means I have to go in somewhere now to find out what is wrong with my system!
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Veronica, my 85 760Ti

Hi Bishop

You could try one of these, but its not 100% garanteed to work, i found this on another site.
" Early systems (Motronic 1.1 only, I think) flash the fault codes automatically. If the check engine light comes on, leave the key in the On position, but dont start the car. The check engine light will begin to flash the code after about 3 seconds. Each flash is separated by about 1 second. There arent many codes on this system

1 flash......Air flow sensor malfunction.
2 flashes....Oxygen sensor malfunction.
3 flashes....Coolant Temp. malfunction.
4 flashes....Throttle switch malfunction.

More detail on these early systems can be found in the Bentley manuals.

Late 1980's systems. Motronic 1.3

The fault codes for these systems will appear on the check engine light when you turn the ignition key to the On position (but dont start it), then: fully depress the accelerator pedal, then fully release it. Repeat the depress,release cycle 5 times fairly quickly, but not too fast. It should be completed in a few seconds. What you are doing here is clicking the wide open throttle switch then the idle switch each 5 times. This signals the Motronic unit to send the fault codes by flashing the Check Engine light. You should see the light flash once then it will start flashing the 4 digit codes. If there are no faults, you should see the 1444 code (and 2444 if you have a 12 cylinder). The codes appear as a series of flashes for each digit. The flashes indicating one digit are about 1 second apart, the next digit appears after a couple second interval. The rest of the fault codes appear in Table 1 below.

Table 1. The Motronic Fault Codes. Malfunctioning System. Fault Code Comments.
DME Control Unit 1211
Air Mass/Volume Sensor 1215
Throttle Potentiometer 1216
Output Stage, Group 1 1218
Output Stage, Group 2 1219
EGO(O2) Sensor 1 1221
EGO(O2) Sensor 2 1212
Lambda Control 1 1222
Lambda Control 2 1213
Coolant Temp. Sensor 1223
Intake Air Temp. Sensor 1224
Knock Sensor 1 1225
Knock Sensor 2 1226
Knock Sensor 3 1227
Knock Sensor 4 1228
Battery Voltage/DME Main Relay 1231
Throttle Idle Switch 1232
Throttle WOT Switch 1233
Speedometer A Signal 1234
A/C Compressor cut off 1237
A/C Compressor 1242
Crankshaft Pulse Sensor 1243
Camshaft Sensor 1244
Intervention AEGS 1245
Ignition Secondary Monitor 1247
Fuel Injector 1 (or group 1) 1251
Fuel Injector 2 (or group 2) 1252
Fuel Injector 3 1253
Fuel Injector 4 1254
Fuel Injector 5 1255
Fuel Injector 6 1256
Fuel Injector 7 1257
Fuel Injector 8 1258
Fuel Pump Relay Control 1261
Idle Speed Actuator 1262
Purge Valve 1263
EGO Heater 1264
Fault Lamp (check engine) 1265
VANOS 1266
Air Pump Relay Control 1267
Ignition Coil 1 1271
Ignition Coil 2 1272
Ignition Coil 3 1273
Ignition Coil 4 1274
Ignition Coil 5 1275
Ignition Coil 6 1276
Ignition Coil 7 1277
Ignition Coil 8 1278
Control Unit Memory Supply 1281
Fault Code Memory 1282
Fuel Injector Output Stage 1283
Knock Control test Pulse 1286
No Failures 1444
For 12 cylinder models, there are additional codes for the second Motronic unit. These codes are the same as above, but the first digit (1) is replaced by 2.
Hope this helps

DM

That's for the later model units, the early units in the Volvos did not even have a check engine light.

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Veronica, my 85 760Ti

Veronica
yea chances are your not going to find a way to get those codes without paying someone to pull them for you, the reason no one has come up with a cable to connect to the computer is because its pretty darn hard to devolope the software to actually work together with the 2.