Test for ECU on crank detection

To perform diagnosis, turn ignition on. Ensure function
selector cable is in diagnostic unit "A", socket No. 6.
Diagnostic Test Mode No. 2 (Function Testing)
Press test button 2 times to activate test mode No. 2. LED
should flash rapidly. ECU should deliver an acknowledgment code when a
signal is received from the following:
* 1-4-1 - VSS (as flywheel rotates).
* 3-4-2 - CMP (as camshaft rotates).