Page 79 of 139

AUTOMATIC TRANSMISSION
Fault finding - Conformity check
23A
23A - 79V5 MR-372-J84-23A100$464.mif
SIEMENS TA2005
Vdiag No.: 14-18
SUB-FUNCTION: PRESSURE CONTROL
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(no present or stored faults).
Application conditions: engine stopped, ignition on.
The values indicated in this conformity check are given as examples.
Order FunctionParameter or Status
checked or ActionDisplay and Notes Fault finding
1Gear engagedET013:Gear engagedR for reverse.
1P for 1
st locked.
2P for 2nd locked.
3P for 3rd locked.
4P for 4th locked.
1G for 1st slipping.
2G for 2nd slipping.
3G for 3rd slipping.
4G for 4th slipping.
1 for 1st unlocked.
2 for 2nd unlocked.
3 for 3rd unlocked.
4 for 4th unlocked.In the event of a
fault, refer to the
interpretation of this
status.
2Engine speedPR006:Engine speed0 rpmIn the event of a
fault, refer to the
interpretation of
fault DF236 "Invalid
engine speed
multiplex signal".
3Oil pressurePR003:Oil pressureX < 0.2 barIn the event of a
fault, consult the
interpretation of this
parameter.
4Gearbox oil
pressure sensor
voltagePR118:Gearbox oil
pressure sensor
voltageX = 5 VIn the event of a
fault, consult the
interpretation of this
parameter.
5Reference
pressurePR138:Reference
pressure21 bar None.
Page 108 of 139
Fault finding - Parameter summary table23A
23A - 108V5 MR-372-J84-23A100$638.mif
SIEMENS TA2005
Vdiag No.: 14-18AUTOMATIC TRANSMISSION
Fault finding - Parameter summary table
Tool parameter Diagnostic tool title
PR001Coolant temperature
PR003Oil pressure
PR004Gearbox oil temperature
PR006Engine speed
PR007Turbine speed
PR008Computer feed voltage
PR105Vehicle speed
PR118Gearbox oil pressure sensor voltage
PR123Calculated engine torque
PR124Accel. pedal position for downshifting
PR126Current turbine speed
PR128Engine/turbine speed difference
PR135Standard pedal position
PR136Raw pedal position
PR138Reference pressure
PR146Difference between reference and oil pressure
MR-372-J84-23A100$638.mif
Page 119 of 139

AUTOMATIC TRANSMISSION
Fault finding - Interpretation of parameters23A
23A - 119V5 MR-372-J84-23A100$696.mif
SIEMENS TA2005
Vdiag No.: 14-18
PR126
CURRENT TURBINE SPEED
NOTESThere must be no present or stored faults.
Check the cleanliness and condition of the turbine speed sensor and its connections.
Check the insulation, continuity and the absence of interference resistance to earth, to + 12 V and the
following connections:
●connection code 5DA, between components 119 and 1017,
●connection code 5DB, between components 119 and 1017.
If any of the 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.
Check the turbine speed on the diagnostic tool:
Gear lever position at N or P.
Oil temperature 43 ˚C: turbine speed ~ 681 rpm and engine speed: ~ 743 rpm.
Oil temperature 45 ˚C: turbine speed ~ 654 rpm and engine speed: ~ 743 rpm.
AFTER REPAIRRepeat the conformity check from the start.
DP0TA2005_V14_PR126/DP0TA2005_V18_PR126
Page 120 of 139
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of parameters23A
23A - 120V5 MR-372-J84-23A100$696.mif
SIEMENS TA2005
Vdiag No.: 14-18
PR128
ENGINE/TURBINE SPEED DIFFERENCE
NOTESThere must be no present or stored faults.
Check the cleanliness and condition of the engine speed sensor and its connections.
Run a multiplex network test (see 88B, Multiplex).
After these checks, if parameter PR006 Engine speed is absent, refer to the interpretation of the parameter
(see 17B, Petrol injection or 13B, Diesel injection).
Check the cleanliness and condition of the turbine speed sensor and its connections.
This parameter is the difference between parameter PR006 Engine speed and parameter PR007 Turbine speed.
Check the engine/turbine speed difference with the diagnostic tool:
Engine idling:
Engine speed: ~ 743 rpm and turbine speed: ~ 654 rpmdifference = ~ 89 rpm.
AFTER REPAIRRepeat the conformity check from the start.
DP0TA2005_V14_PR128/DP0TA2005_V18_PR128