Description (page 2 of 9)

ENGINE MANAGEMENT SYSTEM - SIEMENS

DESCRIPTION AND OPERATION 18-4-33

0123

Throttle potentiometer 1

Short circuit to battery

Yes

Yes

B

0125

ECT sensor

Open circuit, short circuit to 

ground or signal implausible

No

No

—

0128

Thermostat monitoring 

sensor

Low coolant temperature – 

thermostat stuck open

Yes

No

B

0130

LH bank front HO2S signal

Open circuit

Yes

No

C

0131

LH bank front HO2S signal

Short circuit to earth

Yes

No

C

0132

LH bank front HO2S signal

Short circuit to battery

Yes

No

C

0133

LH bank front HO2S signal

Slow response

Yes

No

C

0134

LH bank front HO2S signal

Signal not switching

Yes

No

C

0135

LH bank front HO2S heater 

circuit

Open circuit or short circuit to 

battery or earth

No

No

—

0136

LH bank rear HO2S signal

Open circuit

Yes

No

C

0137

LH bank rear HO2S signal

Short circuit to earth

Yes

No

C

0138

LH bank rear HO2S signal

Short circuit to battery

Yes

No

C

0139

LH bank rear HO2S signal

Slow response

Yes

No

C+

0140

LH bank rear HO2S signal

No activity

Yes

No

C+

0141

LH bank rear HO2S heater 

circuit

Open circuit or short circuit to 

battery or earth

No

No

—

0150

RH bank front HO2S signal

Open circuit

Yes

No

C

0151

RH bank front HO2S signal

Short circuit to earth

Yes

No

C

0152

RH bank front HO2S signal

Short circuit to battery

Yes

No

C

0153

RH bank front HO2S signal

Slow response

Yes

No

C

0154

RH bank front HO2S signal

Signal not switching

Yes

No

C

0155

RH bank front HO2S heater 

circuit

Open circuit or short circuit to 

battery or earth

No

No

—

0156

RH bank rear HO2S signal

Open circuit

Yes

No

C

0157

RH bank rear HO2S signal

Short circuit to earth

Yes

No

C

0158

RH bank rear HO2S signal

Short circuit to battery

Yes

No

C

0159

RH bank rear HO2S signal

Slow response

Yes

No

C

0160

RH bank rear HO2S signal

No activity

Yes

No

C+

0161

RH bank rear HO2S heater 

circuit

Open circuit or short circuit to 

battery or earth

No

No

—

0171

LH bank lambda control

Fuelling too lean

Yes

No

C

0172

LH bank lambda control

Fuelling too rich

Yes

No

C

0174

RH bank lambda control

Fuelling too lean

Yes

No

C

0175

RH bank lambda control

Fuelling too rich

Yes

No

C

0201

Fuel injector 1

Open circuit

Yes

No

A

0202

Fuel injector 2

Open circuit

Yes

No

A

0203

Fuel injector 3

Open circuit

Yes

No

A

0204

Fuel injector 4

Open circuit

Yes

No

A

0205

Fuel injector 5

Open circuit

Yes

No

A

0206

Fuel injector 6

Open circuit

Yes

No

A

0222

Throttle potentiometer 2

Open circuit or short circuit to 

earth

Yes

Yes

B

0223

Throttle potentiometer 2

Short circuit to battery

Yes

Yes

B

0261

Fuel injector 1

Short circuit to earth

Yes

No

A

0262

Fuel injector 1

Short circuit to battery

Yes

No

A

0264

Fuel injector 2

Short circuit to earth

Yes

No

A

0265

Fuel injector 2

Short circuit to battery

Yes

No

A

0267

Fuel injector 3

Short circuit to earth

Yes

No

A

P Code No.

Component/Signal

Fault Description

Warning Lamp

Drive Cycle

SERVICE 

ENGINE 

(MIL)

SERVICE 

ENGINE 

SOON