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Home >> Mercedes Benz >> 2000 >> ML430 >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Mixture Formation - 163 Chassis (3 Of 4) >> Self-Diagnostic System >> Command valve jams in pressure position, ME-SFI fault code description - AD07.61-P-4000-28L

Command valve jams in pressure position, ME-SFI fault code description - AD07.61-P-4000-28L

    Command valve jams in pressure position
1 Fault code
(USA ONLY Display on generic scan tool)
P206A (P0700)
2 Fault storage after expiry of test duration and fault
Actuation of the indicator lamp
  • Engine diagnosis (EURO3/4)
  • CHECK ENGINE (MIL) USA ONLY
  • No actuation
  • Following two successive driving cycles with faults
3 Checking frequency Continuous
4 Checked signal or status Calculated gear ratios outside of tolerance
5 Fault setting conditions  ±0, 20 1st/2nd gear
Permissible deviation from respective gear ±0, 05 3rd gear
ratio ±0, 03 4th/5th gear
Checking duration ±0, 20 Reverse gear
  approx. 2 seconds
6 Check prerequisites
  • Engine speed greater than 400 rpm
  • Output shaft speed greater than 180 rpm (corresponds to around 20 km/h)
  • No shift operation.
7 Check procedure After each shift operation the shift pressure is reduced slowly. If shift elements drag as the pressure drops, the command valve jams in the pressure position. Dragging shift elements are detected by the respective gear ratio.
8 IMPORTANT The gear ratios are calculated from the following variables: speed signal n2, speed signal n3 and output shaft speed (determined via rear wheel speed).
Faults are detected by the ETC control unit and sent via the CAN data bus to the ME-SFI engine control unit. Fault storage and actuation of the CHECK ENGINE (MIL) indicator lamp is carried out by the ME-SFI control unit.
Also read out ETC fault memory.