Displays Test
Certain instrument panel cluster (IPC) features are tested when the ignition
is turned ON in order to verify the features are working properly. The following occurs
at key up:
• | The air bag indicator flashes for 7 seconds. |
• | All other IPC indicators illuminate briefly. |
• | The PRNDL and odometer segments illuminate. |
Indicators and Warning Messages
Refer to
Indicator/Warning Message Description and Operation
.
Engine Coolant Temperature (ECT) Gage
The instrument panel cluster (IPC) displays the engine coolant temperature on
the analog engine coolant temperature (ECT) gage as determined by the powertrain control
module (PCM). The PCM monitors the signal circuit of the ECT sensor. The IPC receives
a class 2 message from the PCM indicating the engine coolant temperature. The
IPC illuminates the check gages indicator when a high engine coolant temperature condition
exists. The ECT gage defaults to 75°C (160°F) or below when one of the following
conditions occur:
• | The PCM detects a malfunction in the ECT sensor signal circuit. |
• | The IPC detects a loss of class 2 communication with the PCM. |
For additional information on the engine cooling system, refer to
Cooling System Description and Operation
in Engine Cooling.
Engine Oil Pressure (EOP) Gage
The instrument panel cluster (IPC) displays the engine oil pressure on the analog
engine oil pressure (EOP) gage as determined by the powertrain control module (PCM).
The PCM monitors the signal circuit of the EOP sensor. When the EOP sensor resistance
is high, the engine oil pressure is high. When the EOP sensor resistance is low, the
engine oil pressure is low. The IPC receives a class 2 message from the PCM
indicating the engine oil pressure. The IPC illuminates the check gages indicator
when a low oil pressure condition exists. The EOP gage defaults to 0 kPa (0 psi)
when the following condition occurs:
• | The PCM detects a malfunction in the EOP sensor signal circuit. |
• | The IPC detects a loss of class 2 communication with the PCM. |
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level on the analog fuel
gage as determined by the powertrain control module (PCM). The PCM monitors the signal
circuit of the fuel level sensor. When the fuel level sensor resistance is high, the
fuel gage indicates full. When the fuel level sensor resistance is low, the fuel gage
indicates empty. The IPC receives a class 2 message from the PCM indicating
the filtered fuel level percent. The PCM uses 2 filters for the fuel level
percent. The slow filter is used during normal operation. The fast filter is used
when the engine is just started or when the vehicle is in Park or Neutral. The fast
filter allows the fuel gage to reach the current fuel level quickly. The fuel gage
defaults to empty when the following conditions occur:
• | The IPC detects a loss of class 2 communications with the PCM. |
Reviewing the fuel system description will further explain how the system functions.
Refer to the following procedures:
Odometer
The instrument panel cluster (IPC) displays the season odometer, the trip odometer A,
and the trip odometer B. Momentarily press the trip/reset switch on the IPC
in order to toggle the odometer display between the season odometer, the trip odometer A,
and the trip odometer B. Press the trip/reset switch for greater than 2 seconds,
while the trip odometer A or the trip odometer B is displayed, in order
to reset the trip odometer. The IPC calculates the mileage based on the vehicle speed
class 2 message from the powertrain control module (PCM). The IPC updates the
values of both trip odometer A and trip odometer B regardless of the
trip odometer being displayed. The odometer will display Error if an internal IPC
memory failure is detected.
PRNDL Display
The instrument panel cluster (IPC) displays the selected gear position as determined
by the powertrain control module (PCM). The IPC receives a class 2 message
indicating the gear position. The PRNDL display blanks when the following conditions
occur:
• | The PCM detects a malfunction in the transmission range switch circuit. |
• | An invalid PRNDL position is received. |
• | The IPC detects a loss of class 2 communications with the PCM. |
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information
from the powertrain control module (PCM). The PCM calculates the vehicle speed from
the vehicle speed sensor (VSS) circuit. The IPC receives a class 2 message
from the PCM indicating the vehicle speed. The PCM also calculates the vehicle speed
based on the wheel reference vehicle speed class 2 message from the electronic
brake control module (EBCM). The PCM uses the vehicle speed information from the EBCM
as a backup. The IPC displays the vehicle speed information from the EBCM when the
PCM detects a malfunction in the vehicle speed sensor circuit.
The speedometer defaults to 0 km/h (0 mph) if the IPC detects
a loss of class 2 communications with both the PCM and the EBCM.
Voltmeter
The instrument panel cluster (IPC) displays the system voltage as detected at
the ignition 1 input of the IPC. When the engine is ON, the gage should be
between 10-16 volts.