Testing 1 Switch off ignition. Detach connector from ignition distributor pickup (green cable on control module) (arrow). Caution! On injection engines, detach the fuel pump relay module (N1614) before turning the crankshaft to ensure that no fuel is injected. Model 201 2 Connect compression pressure recorder. This is done by clamping one of the two alligator clamps (arrow) of the compression pressure recorder, Part No. 001 589 76 21 00, to the positive terminal post of the battery. 3 Detach connector (X27) from plug connection (terminal 50). 4 Plug in connector of adapter cable (01), Part No. 124 589 36 63 00. Model 201 01.0904 - 01 o/3