Page 343 of 510
13B-343
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR037REFRIGERANT PRESSURE
PARAMETER
DEFINITIONThis parameter indicates the refrigerant pressure in bar.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check with the engine running and engine coolant temperature > 80°C
The value should be higher than 2 bar.
EDC16CP33_V18_PR037 / EDC16CP33_V1C_PR037 / EDC16CP33_V54_PR037 / EDC16CP33_V20_PR037 / EDC16CP33_V58_PR037 /
EDC16CP33_V5C_PR037 / EDC16CP33_V24_PR037 / EDC16CP33_V04_PR037 / EDC16CP33_V08_PR037 / EDC16CP33_V44_PR037 /
EDC16CP33_V4C_PR037 / EDC16CP33_V34_PR037 / EDC16CP33_V38_PR037 / EDC16CP33_V74_PR037 / EDC16CP33_V60_PR037 /
EDC16CP33_V62_PR037
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 34, 38, 44, 4C, 54,
58, 5C, 60, 62, 74
Page 344 of 510

13B-344
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR038RAIL PRESSURE
PARAMETER
DEFINITIONThis parameter indicates the rail pressure in bar.
NOTESThere must be no present or stored faults.
Perform this fault finding procedure:
– after finding an inconsistency in the parameter,
– after a customer complaint (starting faults, poor performance, stalling etc.),
– after interpretation of command AC225 Rail pressure regulator.
Special notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on
The rail pressure value is between:
0 bar < PR038 < 90 bar if the coolant temperature < 30°C.
In the event of a fault, consult the interpretation of fault DF007 Rail pressure sensor circuit.
Conformity check with the engine running and engine coolant temperature > 80°C
The rail pressure value must be between:
250 bar < PR038 < 290 bar (at idle speed),
1680 bar < PR038 < 1720 bar (full load).
In the event of a fault, refer to the interpretation of fault DF007.
EDC16CP33_V18_PR038 / EDC16CP33_V1C_PR038 / EDC16CP33_V54_PR038 / EDC16CP33_V20_PR038 / EDC16CP33_V58_PR038 /
EDC16CP33_V5C_PR038 / EDC16CP33_V24_PR038 / EDC16CP33_V04_PR038 / EDC16CP33_V08_PR038 / EDC16CP33_V44_PR038 /
EDC16CP33_V4C_PR038 / EDC16CP33_V34_PR038 / EDC16CP33_V38_PR038 / EDC16CP33_V74_PR038 / EDC16CP33_V38_PR028 /
EDC16CP33_V62_PR038 / EDC16CP33_V26_PR038 / EDC16CP33_V60_PR038
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 351 of 510

13B-351
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR053SPEED REQUESTED BY HEATING/AIR CONDITIONING
PARAMETER
DEFINITIONThis parameter indicates the engine's speed of rotation with air conditioning in rpm.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Note:
Take parameter PR053 into account only if PR037 Refrigerant pressure > 12 bar.
Conformity check: Engine stopped and ignition on
The value of the engine speed with air conditioning must be:
PR053 = 0 rpm (ignition on).
Conformity check with the engine running and engine coolant temperature > 80°C
The speed requested by the air-conditioning is increased and varies around 850 rpm.
EDC16CP33_V18_PR053 / EDC16CP33_V1C_PR053 / EDC16CP33_V54_PR053 / EDC16CP33_V20_PR053 / EDC16CP33_V58_PR053 /
EDC16CP33_V5C_PR053 / EDC16CP33_V24_PR053 / EDC16CP33_V04_PR053 / EDC16CP33_V08_PR053 / EDC16CP33_V44_PR053 /
EDC16CP33_V4C_PR053 / EDC16CP33_V34_PR053 / EDC16CP33_V38_PR053 / EDC16CP33_V74_PR053 / EDC16CP33_V28_PR053 /
EDC16CP33_V62_PR053 / EDC16CP33_V26_PR053 / EDC16CP33_V60_PR053
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 360 of 510

13B-360
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR074BATTERY VOLTAGE
PARAMETER
DEFINITIONThis parameter indicates the battery voltage in volts.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
The battery voltage value must be between:
8.5 V < PR074 < 15 V.
Test the battery and run fault finding on the charging circuit (see Technical Note 6014A, Charging circuit check).
EDC16CP33_V18_PR074 / EDC16CP33_V1C_PR074 / EDC16CP33_V54_PR074 / EDC16CP33_V20_PR074 / EDC16CP33_V58_PR074 /
EDC16CP33_V5C_PR074 / EDC16CP33_V24_PR074 / EDC16CP33_V04_PR074 / EDC16CP33_V08_PR074 / EDC16CP33_V44_PR074 /
EDC16CP33_V4C_PR074 / EDC16CP33_V34_PR074 / EDC16CP33_V38_PR074 / EDC16CP33_V74_PR074 / EDC16CP33_V28_PR074 /
EDC16CP33_V62_PR074 / EDC16CP33_V26_PR074 / EDC16CP33_V60_PR074
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 362 of 510

13B-362
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR079ATMOSPHERIC PRESSURE SENSOR VOLTAGE
PARAMETER
DEFINITIONThis parameter indicates the atmospheric pressure sensor voltage in volts.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
The value of the atmospheric pressure sensor voltage must be between:
0 V < PR079 < 5 V.
In the event of a fault, consult the interpretation of faults DF011 Sensor supply no. 1 voltage, DF012 Sensor
supply no. 2 voltage, and DF013 Sensor supply no. 3 voltage.
EDC16CP33_V18_PR079 / EDC16CP33_V1C_PR079 / EDC16CP33_V54_PR079 / EDC16CP33_V20_PR079 / EDC16CP33_V58_PR079 /
EDC16CP33_V5C_PR079 / EDC16CP33_V24_PR079 / EDC16CP33_V04_PR079 / EDC16CP33_V08_PR079 / EDC16CP33_V44_PR079 /
EDC16CP33_V4C_PR079 / EDC16CP33_V34_PR079 / EDC16CP33_V38_PR079 / EDC16CP33_V74_PR079 / EDC16CP33_V28_PR079 /
EDC16CP33_V62_PR079 / EDC16CP33_V26_PR079 / EDC16CP33_V60_PR079
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 363 of 510

13B-363
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR080RAIL PRESSURE SENSOR VOLTAGE
PARAMETER
DEFINITIONThis parameter indicates the rail pressure sensor voltage in volts.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
The value of the rail position sensor voltage must be between:
0 V
In the event of a fault, refer to the interpretation of fault DF013 Sensor feed voltage no. 3.
EDC16CP33_V18_PR080 / EDC16CP33_V1C_PR080 / EDC16CP33_V54_PR080 / EDC16CP33_V20_PR080 / EDC16CP33_V58_PR080 /
EDC16CP33_V5C_PR080 / EDC16CP33_V24_PR080 / EDC16CP33_V04_PR080 / EDC16CP33_V08_PR080 / EDC16CP33_V44_PR080 /
EDC16CP33_V4C_PR080 / EDC16CP33_V34_PR080 / EDC16CP33_V38_PR080 / EDC16CP33_V74_PR080 / EDC16CP33_V28_PR080 /
EDC16CP33_V62_PR080 / EDC16CP33_V26_PR080 / EDC16CP33_V60_PR080
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 365 of 510

13B-365
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR083AIR TEMPERATURE SENSOR VOLTAGE
PARAMETER
DEFINITIONThis parameter indicates the air temperature sensor voltage in volts.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
The value of the air temperature sensor voltage must be between:
0 V < PR083 < 5 V.
In the event of a fault, consult the interpretation of faults DF011 Sensor supply voltage no. 1, DF012 Sensor
supply voltage no. 2 and DF013 Sensor supply voltage no. 3.
EDC16CP33_V18_PR083 / EDC16CP33_V1C_PR083 / EDC16CP33_V54_PR083 / EDC16CP33_V20_PR083 / EDC16CP33_V58_PR083 /
EDC16CP33_V5C_PR083 / EDC16CP33_V24_PR083 / EDC16CP33_V04_PR083 / EDC16CP33_V08_PR083 / EDC16CP33_V44_PR083 /
EDC16CP33_V4C_PR083 / EDC16CP33_V34_PR083 / EDC16CP33_V38_PR083 / EDC16CP33_V74_PR083 / EDC16CP33_V28_PR083 /
EDC16CP33_V62_PR083 / EDC16CP33_V26_PR083 / EDC16CP33_V60_PR083
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Page 366 of 510

13B-366
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR084COOLANT TEMPERATURE SENSOR VOLTAGE
PARAMETER
DEFINITIONThis parameter indicates the coolant temperature sensor voltage in volts.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
The value of the coolant temperature sensor voltage must be between:
0 V < PR084 < 5 V.
In the event of a fault, refer to the interpretation of DF001 Coolant temperature sensor circuit.
EDC16CP33_V18_PR084 / EDC16CP33_V1C_PR084 / EDC16CP33_V54_PR084 / EDC16CP33_V20_PR084 / EDC16CP33_V58_PR084 /
EDC16CP33_V5C_PR084 / EDC16CP33_V24_PR084 / EDC16CP33_V04_PR084 / EDC16CP33_V08_PR084 / EDC16CP33_V44_PR084 /
EDC16CP33_V4C_PR084 / EDC16CP33_V34_PR084 / EDC16CP33_V38_PR084 / EDC16CP33_V74_PR084 / EDC16CP33_V28_PR084 /
EDC16CP33_V62_PR084 / EDC16CP33_V26_PR084 / EDC16CP33_V60_PR084
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74