The Engine test M62/TU test module tests all the engine-specific systems fitted in the vehicle. It proceeds automatically in a defined sequence after the measuring leads have been connected.
All the results are displayed at the end of the test module. They can then be printed out via the diagnostic record.
All the operation values are read out and compared with corresponding setpoint values. They are then evaluated with the three criteria ”OK”, ”In fringe range” and ”Not OK”.
”In fringe range” means that the value of an evaluation variable is still in the permitted tolerance range but the difference to the relevant limit value is less than 5 %.
The camshaft position and the duty factor for activating the VANOS adjustment units on banks 1 and 2 are scanned and compared with setpoint values.
System checks are used to determine the adjustment rate and the tightness of the VANOS units on banks 1 and 2.
The primary-side ignition signals for cylinders 1 to 8 are picked off at the adapter boxes of the DME control unit individually for each cylinder, displayed on the Tester as an oscilloscope measurement and then automatically evaluated.
Because of the existing Tester structure, switching between the individual cylinders must be performed manually.
The activation signals for the fuel injectors of cylinders 1 to 8 are likewise picked off at the adapter box, displayed on the Tester and then automatically evaluated.
When these signals are being measured, it is also necessary to switch manually between the individual cylinders.
The tank ventilation system is checked with the corresponding system check. The result of this check is used to assess the tank ventilation system.
The secondary-air system is checked and assessed with the corresponding system check.
For US vehicles of model series E38 and E39 up to model year 09/2000, the tightness of the tank system is checked with the Tank leakage diagnosis LDP system check.
For US vehicles of model series E53 and E39 from model year 09/2000, the tightness of the tank system is checked with the Tank leakage diagnosis DMTL system check.
On cars with automatic transmissions, the fault memory of the transmission control unit is read out. If a fault is stored, the transmission management system is evaluated as ”Not OK”.
Absolute compression testing will only then be conducted if the rough-running measurement has furnished for at least one cylinder the result ”Not OK” and at the same time the ignition and injection signals are evaluated as ”OK”.
A summary of the results is displayed on the screen. There is then the option of printing them out within the framework of the diagnostic record.