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Home >> Saturn >> 2006 >> Relay 3.9 1, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls - 3.5L - DTC P0496 To DTC U0107) >> DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

This diagnostic applies to internal microprocessor integrity conditions within the powertrain control module (PCM) and the throttle actuator control (TAC) system. This diagnostic also addresses if the PCM is not programmed.

The PCM monitors its ability to read and write to the memory. It also monitors a timing function. The PCM and the TAC processors are used to monitor the TAC system data. Both processors monitor the other processors data to verify that the indicated accelerator pedal position (APP) calculation is correct. The PCM performs an intrusive test in order to confirm that the APP signals are not shorted together. The PCM accomplishes this by pulling the APP sensor 2 low momentarily and looking for sensor 1 to also be pulled low.

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