PCM Controlled Messages

Change Engine Oil Message

The CHANGE ENGINE OIL message is triggered by the Oil Life Left index. When the Oil Life Left index drops to 0%, the Change Engine Oil message will appear to the driven The Oil Life Left index is calculated by the PCM and stored in the EEPROM (see EEPROM ) of the PCM. The PCM uses coolant temperature, engine speed, and vehicle speed to calculate the index. After an oil change, the index may be reset by displaying the Oil Life Left index and then pressing and holding the Reset button on the Instrument Panel Cluster (IPC) for approximately 5 seconds or by using the scan tool. When the value is reset, 100% Oil Life Left will be displayed.

Change Trans Fluid Message

The PCM calculates a Transaxle Fluid Life Index using transaxle temperature and engine state, running or OFF. The Transaxle Fluid Life Index represents the remaining useful transaxle fluid life as a percentage of total life. When transaxle fluid life reaches 0%, the CHANGE TRANS FLUID message will appear. The Transaxle Fluid Life Index can be reset the same as the engine Oil Life Left index.

Cruise Control

This powertrain has a Stepper Motor Cruise Control (SMCC) system which closely approximates a stand alone system, except that the SMCC relies on the PCM to indicate that cruise control is allowed and then signals the PCM when engaged. This is accomplished by using a two wire link between the PCM and SMCC. These are called the Cruise Inhibit and the Cruise Engaged circuits. If the PCM will allow operation, refer to the Cruise Operation table, it signals the SMCC on the Cruise Inhibit circuit to allow cruise. Once cruise is engaged by the driver, the SMCC will continuously signal to the PCM that cruise is engaged using the Cruise Engaged circuit. Refer to Cruise Control for information regarding the cruise system not related to PCM interaction.

Cruise Control Operation

The Stepper Motor Cruise Control module sends the cruise status input to the PCM to indicate when cruise control is engaged. The PCM monitors the cruise status signal while commanding cruise to be disengaged via the cruise inhibit circuit.

Cruise Control Inhibit Mode

Any of the following conditions may cause the PCM to inhibit cruise control operation:
^ Engine not running long enough for cruise control operation.

^ Transaxle range inputs indicate park, neutral, low, or reverse gear selected.

^ Engine speed is too high or too low.

^ Vehicle speed is too high or too low.

^ Traction is active.

^ Vehicle acceleration or deceleration rate is too high.