Computerized Engine Controls: 6.0L

The 6.0L has one Powertrain Control Module (PCM) to control the ignition system and another PCM to control fuel system. The Electronic Fuel Injection (EFI) PCM is located inside right side of trunk, behind trim panel. The ignition system PCM is located underneath right side of instrument panel. The Electronic Fuel Injection (EFI) PCM is a digital PCM with an integral manifold pressure sensor, which governs the amount of fuel to be injected by controlling injector pulse width. Manifold pressure and speed signal provide the main control for fuel injection. PCM uses additional sensors to monitor engine temperature, inlet air temperature and throttle position to ensure optimum air/fuel mixture is computed for all engine operating conditions.

Microprocessor located within the digital ignition system PCM controls timing of low tension voltage by means of 2 ignition coils and 2 power modules. The front coil supplies high tension voltage to "B" bank (left cylinder head) and rear coil supplies high tension voltage to "A" bank (right cylinder head). The PCM controls ignition timing according to inputs received from sensors located on and around the engine. System is equipped with a limp-home mode to permit continued engine operation in the event of certain sensor failures.

NOTE: Components are grouped into 2 categories. The first category covers INPUT DEVICES , which control or produce voltage signals monitored by the PCM. The second category covers OUTPUT SIGNALS , which are components controlled by the PCM.