Freelander System Description and Operation
ENGINE MANAGEMENT SYSTEM - SIEMENS
18-4-32 DESCRIPTION AND OPERATION
Diagnostics
The ECM incorporates On Board Diagnostics (OBD) software that complies with market legislation current at the time
of manufacture. During engine operation the ECM performs self test and diagnostic routines to monitor the
performance of the engine and the EMS. If a fault is detected the ECM stores a related Diagnostic Trouble Code (DTC,
also known as a 'P' code) in a non volatile memory and, for most faults, illuminates the engine SERVICE ENGINE
(MIL) and/or the SERVICE ENGINE SOON warning lamps. Codes are retrieved using TestBook/T4, which
communicates with the ECM via an ISO 9141 K line connection from the diagnostic socket.
P Code No.
Component/Signal
Fault Description
Warning Lamp
Drive Cycle
SERVICE
ENGINE
(MIL)
SERVICE
ENGINE
SOON
0030
Pre CAT LH bank HO2S
heater
Open circuit
Yes
No
C
0031
Pre CAT LH bank HO2S
heater
Short circuit to earth
Yes
No
C
0032
Pre CAT LH bank HO2S
heater
Short circuit to battery
Yes
No
C
0036
Post CAT LH bank HO2S
heater
Open circuit
Yes
No
C
0037
Post CAT LH bank HO2S
heater
Short circuit to earth
Yes
No
C
0038
Post CAT LH bank HO2S
heater
Short circuit to battery
Yes
No
C
0050
Pre CAT RH bank HO2S
heater
Open circuit
Yes
No
C
0051
Pre CAT RH bank HO2S
heater
Short circuit to earth
Yes
No
C
0052
Pre CAT RH bank HO2S
heater
Short circuit to battery
Yes
No
C
0056
Post CAT RH bank HO2S
heater
Open circuit
Yes
No
C
0057
Post CAT RH bank HO2S
heater
Short circuit to earth
Yes
No
C
0058
Post CAT RH bank HO2S
heater
Short circuit to battery
Yes
No
C
0100
MAF sensor signal
Open circuit
No
No
—
0101
MAF sensor signal
Signal implausible
Yes
No
B
0102
MAF sensor signal
Short circuit to earth
Yes
No
A
0103
MAF sensor signal
Short circuit to battery
Yes
No
A
0105
ECM internal ambient
pressure sensor
Circuit malfunction
No
No
—
0107
ECM internal ambient
pressure sensor
Short circuit to earth
Yes
No
A
0108
ECM internal ambient
pressure sensor
Open circuit or short circuit to
battery
Yes
No
A
0109
ECM internal ambient
pressure sensor
Circuit intermittent
No
No
—
0112
IAT sensor
Short circuit to earth
Yes
No
B
0113
IAT sensor
Open circuit or short circuit to
battery
Yes
No
B
0116
ECT sensor
Signal implausible
Yes
No
B
0117
ECT sensor
Short circuit to earth
Yes
No
B
0118
ECT sensor
Open circuit or short circuit to
battery
Yes
No
B
0122
Throttle potentiometer 1
Open circuit or short circuit to
earth
Yes
Yes
B