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 7 times. |
• | The ABS indicator illuminates briefly. |
• | The service engine soon indicator (MIL) illuminates briefly. |
• | The charge indicator illuminates briefly. |
• | The speedometer cycles. |
• | All message center segments illuminate briefly. |
Indicators and Warning Messages
Refer to
Indicator/Warning Message Description and Operation
.
Engine Coolant Temperature Gauge
The IPC displays the engine coolant temperature as determined by the
PCM. The IPC receives a class 2 message from the PCM indicating the
engine coolant temperature. The engine coolant temperature gauge defaults
to 75°C (160°F) or below when:
• | The PCM detects a malfunction in the engine coolant temperature
sensor circuit. |
• | The IPC detects a loss of class 2 communication with the
PCM. |
Engine Oil Pressure Gauge
The IPC uses the engine oil sensor signal to determine the engine oil
pressure. The oil pressure sensor signal circuit is hard-wired to the IPC.
The engine oil pressure sensor signal to the IPC is a variable resistance
ranging from 0-90 ohms. A sensor resistance of 1 ohms
will display as 0 psi (0 kPa) and a resistance of 88 ohms
will display as 80 psi (550 kPa). The Check Engine Oil
Pressure indicator will be displayed in the message center if the
IPC detects a low engine oil pressure.
Fuel Gauge
The IPC displays the fuel level as determined by the PCM. The IPC receives
a class 2 message from the PCM indicating the fuel level percent. The
fuel gauge defaults to empty if:
• | The PCM detects a malfunction in the fuel level sensor circuit. |
• | The IPC detects a loss of class 2 communications with the
PCM. |
When the fuel level is less than a pre-determined value, the low fuel
indicator illuminates.
Reviewing the fuel system description will further explain how the system
functions. Refer to:
Hourmeter
The IPC can display the accumulated engine run time hours using the
VF display when the cluster is in the LOCK or ACC position. The IPC stores
the accumulated engine run time hours in a non-volatile format. The
accumulated hours will not change if the battery was disconnected
or removed. When the ignition is OFF and the trip reset switch is
pushed in and held for more than 4 seconds, the IPC will display the
accumulated hours for 30 seconds. The hourmeter will reset to 0.0
when 10,000 hours are accumulated.
Odometer
The IPC contains a season odometer and a trip odometer. Momentarily
press the trip/reset switch on the IPC in order to toggle between the season
odometer and the trip odometer. Press the trip/reset switch for greater
than 2 seconds, while the trip odometer is displayed, in
order to reset the trip odometer. The IPC displays the vehicle mileage
and trip mileage as determined by the IPC. The IPC calculates the
mileage based on the vehicle speed signal circuit from the PCM.
The odometer will display 'error' if an internal IPC memory failure
is detected. The odometer can be configured to display either miles
or kilometers.
PRNDL Display
The IPC displays the selected gear position as determined by the PCM.
The IPC receives a class 2 message from the PCM indicating the gear
position. The PRNDL display blanks if:
• | The PCM detects a malfunction in the transmission range switch
circuit. |
• | The IPC receives a class 2 message indicating the park
position and the column park switch indicates a position other than park (open
input). |
• | The IPC detects a loss of class 2 communications with the
PCM. |
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal
from the PCM. The IPC receives the vehicle speed signal via a discreet wire.
The IPC uses the vehicle speed signal circuit (4000 pulses/mile)
from the PCM in order to calculate the vehicle speed. The speedometer
defaults to 0 km/h (0 mph) if a malfunction in the
vehicle speed signal circuit (4000 pulses/mile) exists.
Tachometer
The IPC displays the engine speed based on the engine speed signal from
the PCM. The IPC receives the engine speed signal from the PCM via a discreet
wire. The IPC uses the engine speed signal circuit (2 pulses/engine
revolution) from the PCM in order to calculate the engine speed.
The tachometer defaults to 0 rpm if a malfunction in the engine
speed signal circuit (2 pulses/engine revolution) exists.
Transmission Temperature Gauge
The IPC displays the transmission temperature as determined by the PCM.
The IPC receives a class 2 message from the PCM indicating the transmission
temperature. The transmission temperature gauge will default to 40°C
(100°F) or below if:
• | The PCM detects a malfunction in the transmission temperature
sensor circuit. |
• | The IPC detects a loss of class 2 communications with the
PCM. |
Voltmeter
The IPC displays the system voltage as detected at the ignition 1
input of the IPC. When the engine is ON, the gauge should be between 10 and
16 volts.