Description (page 5 of 9)

ENGINE MANAGEMENT SYSTEM - SIEMENS

18-4-36 DESCRIPTION AND OPERATION

1227

APP sensor potentiometer 2

Open circuit or short circuit to 

earth

No

Yes

—

1228

APP sensor potentiometer 2

Short circuit to battery

No

Yes

—

1231

Fuel pump relay

Short circuit to earth

No

No

A

1232

Fuel pump relay

Short circuit to battery

No

No

A

1320

Misfire detection

Reluctor adaption fault

No

No

B

1321

Misfire detection

Reluctor tooth pattern fault

No

No

B

1322

Ignition system

Ignition fault on more than two 

cylinders

No

No

A

1351

Ignition coil 1

Short circuit to battery

No

No

A

1352

Ignition coil 2

Short circuit to battery

No

No

A

1353

Ignition coil 3

Short circuit to battery

No

No

A

1354

Ignition coil 4

Short circuit to battery

No

No

A

1355

Ignition coil 5

Short circuit to battery

No

No

A

1356

Ignition coil 6

Short circuit to battery

No

No

A

1383

Ignition feedback resistor

Open circuit

No

No

A

1391

Ignition coil 1

Spark duration too short

No

No

A

1392

Ignition coil 2

Spark duration too short

No

No

A

1393

Ignition coil 3

Spark duration too short

No

No

A

1394

Ignition coil 4

Spark duration too short

No

No

A

1395

Ignition coil 5

Spark duration too short

No

No

A

1396

Ignition coil 6

Spark duration too short

No

No

A

1450

DMTL pump motor

Change-over valve stuck

Yes

No

A

1451

DMTL pump motor

Reference current unstable

Yes

No

A

1452

DMTL pump motor

Reference current below limit

Yes

No

A

1453

DMTL pump motor

Reference current above limit

Yes

No

A

1454

DMTL change-over valve

Short circuit to battery

Yes

No

A

1455

DMTL change-over valve

Short to earth

Yes

No

A

1456

DMTL change-over valve

Open circuit

No

No

—

1470

VIS balance valve motor

Valve always open

No

No

B

1471

VIS balance valve motor

Valve always closed

No

No

B

1472

VIS power/ butterfly valves 

motor

Valves always open

No

No

B

1473

VIS power/ butterfly valves 

motor

Valves always closed

No

No

B

1474

VIS balance valve motor

Short circuit to battery

No

No

B

1475

VIS balance valve motor

Open circuit or short circuit to 

earth

No

No

B

1476

VIS power/ butterfly valves 

motor

Short circuit to battery

No

No

B

1477

VIS power/ butterfly valves 

motor

Open circuit or short circuit to 

earth

No

No

B

1488

DMTL pump motor

Open circuit or short circuit to 

earth

Yes

No

—

1489

DMTL pump motor

Short circuit to earth

Yes

No

A

1490

DMTL pump motor

Short circuit to battery

Yes

No

A

1537

A/C compressor clutch relay

Short circuit to earth

No

No

A

1538

A/C compressor clutch relay

Short circuit to battery

No

No

A

1540

APP sensor

Both signals implausible

Yes

Yes

B

1541

APP sensor

Signal implausible

No

Yes

—

1564

Cruise control interface ECU

MFL signal bit pattern implausible

No

No

A

P Code No.

Component/Signal

Fault Description

Warning Lamp

Drive Cycle

SERVICE 

ENGINE 

(MIL)

SERVICE 

ENGINE 

SOON