The modern Motronic electronic transmission control is being discussed. Technician A says it momentarily retards ignition timing during transmission shifting. Technician B says the PCM controls the automatic transmission's shift points using spool-type shift valves. Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the Motronic system, which integrates control of ignition and fuel injection, can momentarily retard ignition timing to reduce engine torque during shifting, improving shift smoothness. Technician B is incorrect because the PCM (Powertrain Control Module) does control automatic transmission shift points, but it typically does so electronically rather than using mechanical spool-type shift valves directly.

The Modern Motronic Electronic Transmission Control Is Being Discussed