Description (page 4 of 9)

ENGINE MANAGEMENT SYSTEM - SIEMENS

DESCRIPTION AND OPERATION 18-4-35

1113

ECM internal ambient 

pressure sensor

Automatic section failure

No

No

—

1115

Thermostat monitoring 

sensor

Coolant temperature stuck high

No

No

B

1117

Thermostat monitoring 

sensor

Short circuit to earth

Yes

No

B

1118

Thermostat monitoring 

sensor

Open circuit or short circuit to 

battery

Yes

No

B

1119

Thermostat monitoring 

sensor

Short circuit to earth

No

No

—

1122

APP sensor potentiometer 1

Open circuit or short circuit to 

earth

No

Yes

—

1123

APP sensor potentiometer 1

Short circuit to battery

No

Yes

—

1132

LH bank front HO2S

Heating defective

Yes

No

C

1133

RH bank front HO2S

Heating defective

Yes

No

C

1134

LH bank front HO2S

Slow response time

Yes

No

C

1135

LH bank front HO2S

Rich to lean time slow

Yes

No

C

1136

LH bank front HO2S

Lean to rich time slow

Yes

No

C

1141

Throttle potentiometer 1

Ratio of throttle potentiometer 1 

signal to air flow implausible

Yes

Yes

B

1142

Throttle potentiometer 2

Ratio of throttle potentiometer 2 

signal to air flow implausible

Yes

Yes

B

1146

LH bank lambda control

Downstream fuel trim above lean 

delay time

Yes

No

C

1147

RH bank lambda control

Downstream fuel trim above lean 

delay time

Yes

No

C

1148

LH bank lambda control

Downstream fuel trim above rich 

delay time

Yes

No

C

1149

RH bank lambda control

Downstream fuel trim above rich 

delay time

Yes

No

C

1150

LH bank lambda control

Downstream fuel trim fault at low 

fuel level

Yes

No

C

1151

RH bank lambda control

Downstream fuel trim fault at low 

fuel level

Yes

No

C

1152

RH bank front HO2S

Slow response

Yes

No

C

1153

RH bank front HO2S

Rich to lean time slow

Yes

No

C

1154

RH bank front HO2S

Lean to rich time slow

Yes

No

C

1155

LH bank rear HO2S

Heating defective

Yes

No

C

1160

RH bank rear HO2S

Heating defective

Yes

No

C

1161

LH bank front HO2S

Too rich

Yes

No

C

1162

LH bank front HO2S

Too lean

Yes

No

C

1163

RH bank front HO2S

Too rich

Yes

No

C

1164

RH bank front HO2S

Too lean

Yes

No

C

1165

LH bank lambda control

HO2S fault detected at low fuel 

level

Yes

No

C

1166

RH bank lambda control

HO2S fault detected at low fuel 

level

Yes

No

1167

LH bank rear HO2S

Signal implausible

No

No

1168

RH bank rear HO2S

Signal implausible

No

No

1180

LH bank rear HO2S

Slow response

Yes

No

C+

1181

RH bank rear HO2S

Slow response

Yes

No

C+

P Code No.

Component/Signal

Fault Description

Warning Lamp

Drive Cycle

SERVICE 

ENGINE 

(MIL)

SERVICE 

ENGINE 

SOON