Коды ошибок системы Motronic (ENG)

[UraSuper 138]

Коды ошибок системы Motronic

Getting the fault codes to appear on the "Check Engine" light.
Early systems.

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.

Late 1980s 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.

The later systems up to 1995 (Motronic 3.x)

The fault codes appear in the same way as for the Motronic 1.x systems listed above, but it is much trickier to get them to appear. The timing with which you turn the key then depress and release the accelerator pedal is much more critical. You have to depress and release the pedal 5 times, rhythmically, but much faster than for the earlier system. It usually takes a few tries to get it right.

The very latest systems (1995 on)

Fault codes are not available through the check engine light.

The following table requires a HTML 3.0 browser! Upgrade your browser if it appears garbled or doesnt look like a table.

This table lists all the fault codes we could find. If anyone has others, please send them to us. The faults listed are for all different models and some of them are not applicable like Fuel Injector 8 on a 6 cylinder car.

 

 

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

AC Compressor cut off

1237

AC 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

 

Table 2. Motronic Processors and EPROMs

 

Model Year.

Body Style.

Model.

Processor type.

EPROM type.

9/84 - 9/87

E30

325e/es

1802

2732A

88

E30

325

8052

27256

87-88

E30

325i/is/iX

8052

27256

89-91

E30

325i/is/iX

80515

27256

89-91

E30

M3

8051

27128/256

>8/91

E36

325i/is

MCS-96/51

27C256

>9/92

E36

325i/is/ic

MCS-96/51

27C512

93+

E36

M3-Euro

MCS-96/51

27C256

95+

E36

M3

MCS-96/51

27C512