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Home >> Mercedes Benz >> 2005 >> CLK 320 (209.365) V6-3.2L (112.955) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P2500

P2500


The transmission has an impermissible transmission ratio.


Possible cause:

- Impermissible transmission ratio
Affected functions:

- Engine diagnosis
- Automatic transmission Function

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Test 1: Possible causes and remedial action when fault code P2500 is displayed

1. Possible causes and remedial action when fault code P2500 is displayed

Test 1.1: Notes on repair : Remedial actions MUST be processed in sequence.

Test 1.2: The oil level in the automatic transmission is too low.

Test 1.3: Adaptation data check

Test 1.4: Internal fault in component Y3/6 (electrical control module):

1.1. Notes on repair : Remedial actions MUST be processed in sequence.

1.1. No further information available.

1.2. The oil level in the automatic transmission is too low.

Test 1.2.1: Possible remedy

Test 1.2.2: Inspect oil level, adjust to correct level if necessary.

Test 1.2.3: Repair instructions for automatic transmission

1.2.1. Possible remedy

1.2.1. No further information available.

1.2.2. Inspect oil level, adjust to correct level if necessary.

1.2.2. No further information available.

1.2.3. Repair instructions for automatic transmission
Note

- WIS is not available on this system.
- It is not possible to display the requested WIS document [ ar2700z9722ac ].
- You can start WIS on another system and display the WIS document by entering the document number [ ar2700z9722ac ] in the 'Contents' field.


1.2.3. No further information available.

1.3. Adaptation data check

Test 1.3.1: Definition

Test 1.3.2: Assignment of hydraulic shift elements

Test 1.3.3: Important information on adaptation limit values

Test 1.3.4: Important information on the combination possibilities for adapation end stop values

Test 1.3.5: Reading out adaptation data ( Printout for further investigation )

1.3.1. Definition
Operation number of operation texts and work units or standard texts and flat rates:27-0641DefinitionTransmission adaptation is the automatic adaptation of data in the transmission control module in order to optimize shifting comfort.An adaptation is automatically performed for the following functions in order to compensate for tolerances and wear

- Shift time
- Filling time
- Filling pressure
- Control of torque converter lock-up clutch


1.3.1. No further information available.

1.3.2. Assignment of hydraulic shift elements
Figure legend

- B1Hydraulic brake 1
- B2Hydraulic brake 2
- B3Hydraulic brake 3
- F1Freewheel 1
- F2Freewheel 2
- GGear
- K1Hydraulic clutch 1
- K2Hydraulic clutch 2
- K3Hydraulic clutch 3
- NNeutral gear
- RReverse gear
Footnotes

- 1)Program selector switch in position "S"
- 2)Program selector switch in position "W"
- 3)Shift element for deceleration mode required







1.3.2. No further information available.

1.3.3. Important information on adaptation limit values
Operation number of operation texts and work units or standard texts and flat rates:27-0641NOTESFilling time and switching time

- If the filling time and the shift time are at the adaptation limit value, the adaptation values of further gearshifts may likewise be increased.
- If the adaptation limit values of filling time and shift time are reached, this indicates a fault at a hydraulic shift element in the automatic transmission.
NOTESFilling pressureAdaptation limit value in positive display range

- There is damage in the automatic transmission.This results in severe impairment of shift quality.
- If the filling pressure reaches the maximum value, the adaptation values of further gearshifts may likewise be increased.There may be additional factors which affect the shift quality (e.g. mechanical or hydraulic).
Adaptation limit value in negative display range

- There is no damage in the automatic transmission.The shift quality is not affected.


1.3.3. No further information available.

1.3.4. Important information on the combination possibilities for adapation end stop values
Operation number of operation texts and work units or standard texts and flat rates:27-0641The notes listed below apply only in the case of a customer complaint which can be reproduced.The combinations of adaptation values may provide indications of damage to the corresponding mechanical or hydraulic shift elements (e.g. worn Teflon rings or piston seals) in the automatic transmission.A mandatory element of fault diagnosis is that all the individual points are met simultaneously.Clutch K1

- The filling time of the clutch K1 is more than 10 cycles.
- The shift time of the power upshift 1 - 2 at the full load interpolation point ST2 is close to the upper stop value.
- The shift time of the interpolation points ST1 and ST4 indicates values close to the adaptation limits (approx. 75 % of the stop value).
- The shift time of the power downshift 2 - 1 at the full load interpolation point ST2 is within the upper positive range of values.
Clutch K2

- The filling time of the clutch K2 is more than 10 cycles.
- The shift time of the power upshift 2 - 3 at the full load interpolation point ST2 is close to the upper stop value.
- The shift time of the interpolation points ST1 and ST4 indicates values close to the adaptation limits (approx. 75 % of the stop value).
- The shift time of the power downshift 3 - 2 at the full load interpolation point ST2 is within the upper positive range of values.
Clutch K3

- The filling time of the clutch K3 is more than 10 cycles.
- The shift time of the power upshift 3 - 4 at the full load interpolation point ST2 is close to the upper stop value.
- The shift time of the interpolation points ST1 and ST4 indicates values close to the adaptation limits (approx. 75 % of the stop value).
- The shift time of the power downshift 4 - 3 at the full load interpolation point ST2 is within the upper positive range of values.
Brake B1

- The filling time of brake B1 is more than 10 cycles.
- The shift time of the power upshift 4 - 5 at the full load interpolation point ST2 is close to the upper stop value.
- The shift time of the interpolation points ST1 and ST4 indicates values close to the adaptation limits (approx. 75 % of the stop value).
- The shift time of the power downshift 5 - 4 at the full load interpolation point ST2 is within the upper positive range of values.
Brake B2

- There is at present no clear knowledge available for pinpointing the fault.
- The adaptation values of the filling time for brake B2 and of the shift time for the deceleration downshift 4 - 3 are not, on the basis of experience, adequate for a clear fault diagnosis.
Legend and description for figureThe designation 'ST' (interpolation point) indicates the matching adaptation window.(ST1) Adaptation value at high load and low engine speed(ST2) Adaptation value at high load and high engine speed(ST3) Adaptation value at low load and low engine speed(ST4) Adaptation value at low load and high engine speed(ST5) Adaptation value at very low load and low engine speed(ST6) Adaptation value at very low load and high engine speed







1.3.4. No further information available.

1.3.5. Reading out adaptation data ( Printout for further investigation )

1.3.5. No further information available.

1.3.5. No further information available.

Warning!Communication with ECU required.


1.4. Internal fault in component Y3/6 (electrical control module):
Operation number of operation texts and work units or standard texts and flat rates:27-0641Cause

- Internal fault in component Y3/6 (electrical control module):
REMEDY

- Disassemble and assemble automatic transmission using the repair instructions.
- Exchange electrohydraulic control unit.
Notes on submitting warranty or goodwill claimsSEAG damage code (5 digits): 27 401 End of test

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