AUTOMATIC TRANSMISSION
Fault finding – Introduction23A
23A - 3V4 MR-372-J84-23A050$066.mif
SIEMENS TA2000
Vdiag No.: 10-11-15
To cut off + after ignition, proceed as follows:
–Disconnect the diagnostic tool.
–Press the Start button twice briefly (less than 3 seconds).
–Ensure that the + after ignition feed has been cut off by checking that the computer indicator lights on the
instrument panel have gone out.
Faults
Faults are declared either present or stored (depending on whether they appeared in a certain context and
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
after the + after ignition feed (without any system components being active).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors for these lines (for oxidation, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaint. Note:
The left and right-hand xenon bulb computers are supplied when the dipped headlights are lit.
Therefore fault finding can only be carried out on them after the ignition has been switched on in fault finding mode
(forced + after ignition feed) and the dipped headlights have been switched on.
A synopsis of the general procedure to follow is provided on the following page in the form of a flow chart.
AUTOMATIC TRANSMISSION
Fault finding – System operation23A
23A-10V4 MR-372-J84-23A050$132.mif
SIEMENS TA2000
Vdiag No.: 10-11-15
COMPUTER INPUTS AND OUTPUTS
INPUTS OUTPUTS
Diagnostic socket
Automatic
transmission
computer
Solenoid valve control
+ battery feed
+ after ignition feed + warning lights display
Intersystem signals + diagnostic
socketIntersystem signal + diagnostic
socket
Driver actions (brake light switch,
gear selector, multifunction
switch)Gear lever lock
AUTO sensors (turbine speed, oil
pressure, oil temperature)Reversing lights
Earth
Wire connection
Multiplexed connections
AUTOMATIC TRANSMISSION
Fault finding – Customer complaints23A
23A - 114V4 MR-372-J84-23A050$858.mif
SIEMENS TA2000
Vdiag No.: 10-11-15AUTOMATIC TRANSMISSION
Fault finding – Customer complaints
NOTESOnly refer to Customer complaints after carrying out a complete fault finding
procedure with the diagnostic tool and the conformity check.
NO DIALOGUE WITH THE COMPUTER ALP1
ENGINE STARTING FAULTSALP2
AUTOMATIC TRANSMISSION OPERATING FAULTS ALP3
AUTOMATIC TRANSMISSION MALFUNCTIONING ON
GEAR CHANGINGALP4
ERRATIC GEAR CHANGESALP5
REVERSING LIGHTS DO NOT WORK ALP6
OIL UNDER THE VEHICLEALP7
NO GEAR LEVER LOCK IN POSITION ALP8
GEAR LEVER JAMMED IN "PARK" POSITION (CANNOT
UNLOCK BY DEPRESSING THE BRAKE PEDAL)ALP9
MR-372-J84-23A050$858.mif
AUTOMATIC TRANSMISSION
23A
23A-115V4 MR-372-J84-23A050$924.mif
SIEMENS TA2000
Vdiag No.: 10-11-15AUTOMATIC TRANSMISSION
Fault finding – Fault Finding Chart
ALP1 No dialogue with the computer
NOTESNone.
Try the diagnostic tool on another vehicle.
Check:
–the connection between the diagnostic tool and the diagnostic socket (connection and cable in good condition),
–the power supply to the computer,
–the engine and passenger compartment fuses.
Check that the CLIP sensor is supplied by connections BP32, MAN and NAM of component 225, displayed when
both red indicator lights on the sensor illuminate.
Make sure that the CLIP sensor is connected to the computer's USB port.
Make sure the CLIP sensor is communicating properly with the vehicle's computers; this can be seen by the two
green diodes on the sensor lighting up.
Check the following connections on component 225:
●Connection code AP43 (+ after ignition feed).
●Connection code BP32 (+ battery).
●Connection code MAN (earth).
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.
No communication on line K
Check the continuity, insulation and absence of interference resistance on line K of the diagnostic socket.
Disconnect the automatic transmission computer connector to check the insulation, continuity and the absence
of interference resistance of the following connections:
●Connection code AP4 between components 119 and 1337.
●Connection code BP42 between components 119 and 1337.
●Connection code N between components 119 and 107.
●Connection code 3HK between components 119 and 225.
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.
If the fault is still present, contact the Techline.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
DP0TA2000_V10_ALP1/DP0TA2000_V11_ALP1/DP0TA2000_V15_ALP1
MR-372-J84-23A050$924.mif
AUTOMATIC TRANSMISSION
Fault finding – Fault Finding Chart23A
23A -122V4 MR-372-J84-23A050$924.mif
SIEMENS TA2000
Vdiag No.: 10-11-15
ALP6 Reversing lights do not work
NOTESOnly refer to Customer complaints after carrying out a complete fault finding
procedure with the diagnostic tool and the conformity check.
Check:
–the condition of the fuses in the UPC.
–the condition of the bulbs.
–the condition of the bulb contacts. Repair if necessary.
–Check that the earth is present for the following connections:
●Connection code MAQ of component 172.
●Connection code MZ of component 173.
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.
Switch off the ignition and disconnect the modular connector.
Switch on the ignition again and check for + 12 V after ignition feed on connection AP11 of component 485.
Switch off the ignition and check the continuity on the following connections, with the gear lever in position R:
●Connection code H66P between components 485 and 1337.
●Connection code AP11 between components 485 and 1337.
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.
Check that the gear lever cable is correctly adjusted and check the instrument panel display.
If the continuity is faulty, replace the multifunction switch.
Switch on the ignition.
With the gear lever in position R, check for + 12 V after ignition feed on the following connections:
●Connection code H66P between components 172 and 1337.
●Connection code H66P between components 173 and 1337.
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.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
DP0TA2000_V10_ALP6/DP0TA2000_V11_ALP6/DP0TA2000_V15_ALP6