The “stomp test” is a simple procedure performed to determine the cause of a Check Engine Light (CEL) on a number of vehicles that used the Motronic 1.3 and 1.7 ECUs (such as the 1988-1992 E30 325i) and Motronic 3.x (such as 1991-1995 E36 325i). Motronic 1.3/1.7 ECUs include 173, 175, 179, 282, 380, 381, 524, 525, and 526. 3.x include 402, 403, 404, 413, and 506.

The procedure for performing the stomp test on Motronic 1.3/1.7 is as follows:

  1. Get in your vehicle and shut all doors/trunk.
  2. Turn key to “ON” position, but do not start the vehicle.
  3. Fully depress the accelerator pedal, then completely release for between 0.5 and 1.0 seconds. Repeat this a total of 5 times within 10 seconds.
  4. The CEL will flash once, then it will flash a Fehler Lampen Ort, or Fault Light Code (FLC).
  5. The code will flash as a succession of blinks, with a short pause between each number.
    1. eg. “blink-blink-pause, blink-pause, blink-blink-blink-pause, blink-pause” would be code “2-1-3-1”
    2. If there are no faults, it will flash the code “1444” (for 4, 6, and 8 cylinder engines) or “2444” (for 12 cylinder engines).

The procedure for performing the stomp test on Motronic 3.x is very similar, but differs in the following ways:

  1. The time between key and pedal action must be shorter.
  2. The pedal must be depressed, released, and repeated in quicker succession.
  3. It is a bit trickier and may take a few attempts.

The error codes are as follows:

SYSTEM CODE Comments.

ECU

1211

ECU component failure or bad chip.

AIR FLOW METER

1215

 

THROTTLE POSITION SENSOR

1216

 

OUTPUT GROUP 1

1218

 

OUTPUT GROUP 2

1219

 

EGO(AFR) Sensor 1

1221

 

EGO(AFR) Sensor 2

1212

 

LAMBDA 1

1222

 

LAMBDA 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

1231

 

TPS (IDLE SWITCH)

1232

 

TPS (WIDE OPEN SWITCH)

1233

 

SPEEDOMETER

1234

 

A/C COMPRESSOR CUT OFF

1237

 

A/C COMPRESSOR

1242

 

CRANKSHAFT POSITION SENSOR

1243

 

CAMSHAFT POSITION SENSOR

1244

 

AUTOMATIC TRANSMISSION ERROR

1245

 

IGNITION TIME MONITOR EXCEEDED

1247

 

INJECTOR 1 (OR BANK 1)

1251

 

INJECTOR 2 (OR BANK 2)

1252

 

INJECTOR 3

1253

 

INJECTOR 4

1254

 

5

1255

 

6

1256

 

7

1257

 

8

1258

 

FUEL PUMP RELAY

1261

 

IDLE ACTUATOR

1262

 

PURGE VALVE

1263

 

EGO HEATER

1264

 

FAULT LAMP

1265

 

VANOS

1266

 

AIR PUMP RELAY

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

 

INTERNAL MEMORY ERROR

1281

 

FAULT CODE MEMORY ERROR

1282

 

INJECTION TIME OUTSIDE LIMITS

1283

 

KNOCK CONTROL SYSTEM

1286

 

No Failures

1444