Page 337 of 510

13B-337
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
PR017FUEL FLOW
PARAMETER
DEFINITIONThis parameter indicates the fuel flow in mg/st.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on
The fuel flow value must be:
PR017 = 0 mg/st (ignition on).
In the event of a fault, consult the interpretation of DF897 Pump pressure regulator circuit.
Conformity check with the engine running and engine coolant temperature > 80°C
Engine running: PR017 = PR157: Fuel flow setpoint.
In the event of a fault, refer to the interpretation of fault DF897.
EDC16CP33_V18_PR017 / EDC16CP33_V1C_PR017 / EDC16CP33_V54_PR017 / EDC16CP33_V20_PR017 / EDC16CP33_V58_PR017 /
EDC16CP33_V5C_PR017 / EDC16CP33_V24_PR017 / EDC16CP33_V04_PR017 / EDC16CP33_V08_PR017 / EDC16CP33_V44_PR017 /
EDC16CP33_V4C_PR017 / EDC16CP33_V34_PR017 / EDC16CP33_V38_PR017 / EDC16CP33_V74_PR017 / EDC16CP33_V28_PR017 /
EDC16CP33_V62_PR017 / EDC16CP33_V26_PR017 / EDC16CP33_V60_PR017
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 338 of 510

13B-338
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
PR022EGR VALVE POSITION FEEDBACK LOOP DIFFERENCE
PARAMETER
DEFINITIONThis parameter indicates the percentage difference between the setpoint and the EGR
valve position.
NOTESSpecial notes:
Only perform these tests if the parameters do not correspond with the system
operation programming.
Conformity check: Engine stopped and ignition on
This parameter indicates the percentage difference between the setpoint and the EGR valve position.
In the event of a fault, consult the interpretation of faults DF209 EGR valve position sensor circuit and DF647
EGR valve position regulation.
Conformity check with the engine running and engine coolant temperature > 80°C
The PR022 value must be between:
- 5% < PR022 < + 5%.
In the event of a fault, refer to the interpretation of faults DF209 and DF647.
EDC16CP33_V18_PR022 / EDC16CP33_V1C_PR022 / EDC16CP33_V54_PR022 / EDC16CP33_V20_PR022 / EDC16CP33_V58_PR022 /
EDC16CP33_V5C_PR022 / EDC16CP33_V24_PR022 / EDC16CP33_V04_PR022 / EDC16CP33_V08_PR022 / EDC16CP33_V44_PR022 /
EDC16CP33_V4C_PR022 / EDC16CP33_V34_PR022 / EDC16CP33_V38_PR022 / EDC16CP33_V74_PR022 / EDC16CP33_V28_PR022 /
EDC16CP33_V62_PR022 / EDC16CP33_V26_PR022 / EDC16CP33_V60_PR022
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 339 of 510
13B-339
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
PR023DIFFERENCE IN AIR FLOW
PARAMETER
DEFINITIONThis parameter indicates the difference between the inlet air flow and the air entering
the engine in mg/st.
NOTESNone.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
In the event of a fault, consult the interpretation of fault DF056 Air flow sensor circuit.
EDC16CP33_V04_PR023 / EDC16CP33_V08_PR023 / EDC16CP33_V44_PR023 / EDC16CP33_V4C_PR023 / EDC16CP33_V34_PR023 /
EDC16CP33_V38_PR023 / EDC16CP33_V74_PR023 / EDC16CP33_V26_PR023 / EDC16CP33_V28_PR023 / EDC16CP33_V60_PR023 /
EDC16CP33_V62_PR023
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 26, 28,
34, 38, 44, 4C, 60, 62, 74
Page 340 of 510

13B-340
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
PR030ACCELERATOR PEDAL POSITION
PARAMETER
DEFINITIONThis parameter indicates the accelerator pedal position as a percentage.
NOTESThere must be no present or stored faults.
Perform this fault finding procedure:
– after finding an inconsistency in the parameter,
– after a customer complaint (e.g. lack of power, etc.).
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
If no pressure is being applied to the pedal PR030 = 0%.
In the event of a fault, consult the interpretation of DF196 Pedal sensor circuit gang 1 or DF198 Pedal sensor
circuit gang 2.
Sensor electrical conformity
Check the continuity and absence of interference resistance of the following connections:
–3LR between components 120 and 921,
–3LS between components 120 and 921,
–3LT between components 120 and 921,
–3LU between components 120 and 921,
–3LW between components 120 and 921,
–3LV between components 120 and 921.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
EDC16CP33_V18_PR030 / EDC16CP33_V1C_PR030 / EDC16CP33_V54_PR030 / EDC16CP33_V20_PR030 / EDC16CP33_V58_PR030 /
EDC16CP33_V5C_PR030 / EDC16CP33_V24_PR030 / EDC16CP33_V04_PR030 / EDC16CP33_V08_PR030 / EDC16CP33_V44_PR030 /
EDC16CP33_V4C_PR030 / EDC16CP33_V34_PR030 / EDC16CP33_V38_PR030 / EDC16CP33_V74_PR030 / EDC16CP33_V28_PR030 /
EDC16CP33_V62_PR030 / EDC16CP33_V26_PR030 / EDC16CP33_V60_PR030
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 341 of 510
13B-341
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
PR030
CONTINUED
The accelerator pedal sensor should be connected, the vehicle should have the ignition on and the engine
switched off:
– Check that the accelerator pedal value is:
PR030 = 0%: no load,
100% < PR030 < 120%: full load,
135% < PR030 < 145%: full load after pedal kickdown point.
If the value is not correct, replace the pedal sensor.
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 342 of 510

13B-342
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
PR035ATMOSPHERIC PRESSURE
PARAMETER
DEFINITIONThis parameter indicates the atmospheric pressure in bar. The sensor is integrated in
the computer.
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 atmospheric pressure value must be between:
0.80 bar < PR035 < 1.20 bar.
In the event of a fault, consult the interpretation of fault DF004 Turbocharging pressure sensor circuit and
DF200 Atmospheric pressure sensor.
EDC16CP33_V18_PR035 / EDC16CP33_V1C_PR035 / EDC16CP33_V54_PR035 / EDC16CP33_V20_PR035 / EDC16CP33_V58_PR035 /
EDC16CP33_V5C_PR035 / EDC16CP33_V24_PR035 / EDC16CP33_V04_PR035 / EDC16CP33_V08_PR035 / EDC16CP33_V44_PR035 /
EDC16CP33_V4C_PR035 / EDC16CP33_V34_PR035 / EDC16CP33_V38_PR035 / EDC16CP33_V74_PR035 / EDC16CP33_V28_PR035 /
EDC16CP33_V62_PR035 / EDC16CP33_V26_PR035 / EDC16CP33_V60_PR035
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 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