Gauges Cluster

SPEEDOMETER/ODOMETER
The speedometer receives vehicle speed information from the Powertrain Control Module (PCM). The vehicle speed signal is passed through an RC filter to the input of the speedometer/odometer driver Integrated Circuit (IC), located in the instrument panel cluster. The high-to-low edge of the square wave input triggers the IC to provide a well defined pulse of current to the coil of the speedometer gage. The IC also counts the input transitions and uses this information to drive the odometers. The vehicle completes one mile for every 5000 pulses received from the PCM.

There are two odometers in the instrument panel cluster. The odometer shows total mileage since the vehicle was built and cannot be reset. The trip odometer which shows total mileage since last reset, and can be reset to zero at any time. The two odometers are not synchronized. This means that even through one of the odometers may advance by a mile/kilometer the other one may or may not advance to the next mile/kilometer at the same time. The odometer is back lit by a single bulb to make it easier to read in all lighting conditions.

NOTE: The odometer always powers up in the season odometer mode, regardless of which mode was selected before turning ignition Off.

The button located next to the odometer allows you to switch from odometer (6 digit display) to trip odometer (4 digit display). By pressing this button, you can toggle between the odometer and the trip odometer. To reset the trip odometer to zero, select trip odometer and hold the button in for one to two more seconds.

NOTE: The odometer mileage remains readable for several minutes after ignition is turned Off.

TACHOMETER
The tachometer is directly controlled by the powertrain control module (PCM) using a Pulse Width Modulated (PWM) signal based on the signal received from the Crankshaft Position (CKP) sensor. The PWM signal to the cluster is passed through an RC filter and sent to the tachometer driver integrated circuit (IC). The high-to-low edge of the PWM signal triggers the IC to provide a well defined pulse of current to the coil of the tachometer. The engine completes one revolution for every six pulses received from the PCM. The PCM monitors circuit 121 for an open, short to ground or short to voltage and will set DTC P1693 if certain parameters are met.

FUEL GAGE
The fuel gage is controlled by the powertrain control module (PCM) using a pulse width modulated (PWM) signal based on the signal received from the fuel level sensor. The duty cycle of the PWM signal is directly related to the reading of the fuel level sensor. As the duty cycle increases the fuel level reading displayed by the gage will increase. The PWM signal to the cluster is passed through an RC filter and sent to the fuel gage. The PCM monitors circuit 455 for an open, short to ground, or short to voltage and will set DTC P0656 if certain parameters are met.

COOLANT TEMPERATURE GAGE
The coolant temperature gage is controlled by the powertrain control module (PCM) using a pulse width modulated (PWM) signal based on the signal received from the Engine Coolant Temperature (ECT) sensor. The duty cycle of the PWM signal is directly related to the reading of the coolant temperature gage. As the duty cycle increases the temperature reading displayed by the gage will increase. The PWM signal to the cluster is passed through an RC filter and sent to the coolant temperature gage. The PCM monitors circuit 135 for an open, short to ground or short to voltage and will set DTC P1691 if certain parameters are met.