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 indicators illuminate for 3 seconds:
| • | The CHECK GAGES indicator |
| • | The GATE AJAR indicator |
| • | The OVERSPEED indicator |
| • | The Park Brake indicator |
| • | The SERVICE 4WD indicator |
| • | The TOW / HAUL indicator |
| • | All gages sweep to their minimum physical position and then to
their actual physical position. |
The following indicators illuminate for the specified
times:
| • | The AIR BAG indicator flashes 7 times. |
| • | The Fasten Safety Belt indicator illuminates for 20 seconds
followed by 55 seconds of flashing with the drivers seatbelt unfastened,
or, the Fasten Safety Belt indicator will illuminate for 8 seconds
with the drivers seatbelt fastened. |
| • | The SERVICE ENGINE SOON (MIL) indicator illuminates and remains
on. |
Indicators and Warning Messages
Refer to
Indicator/Warning Message Description and Operation
.
Engine Coolant Temperature Gage
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 gage defaults
to 100°F (40°C) or below if:
| • | The PCM detects a malfunction in the engine coolant temperature
sensor circuit. |
| • | The IPC detects a loss of class 2 communications with the
PCM. |
Engine Oil Pressure Gage
The IPC uses the engine oil pressure sensor signal to determine the
engine oil pressure. The oil pressure sensor signal circuit is solely dedicated
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).
Fuel Gage
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 gage 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.
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.
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 displays blank 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 information from the
PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile
signal. The IPC uses the vehicle speed signal circuit 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
exists.
Tachometer
The IPC displays the engine speed based on the information from the
PCM. The PCM converts the data from the engine speed sensor to a 2 pulses/engine
revolution signal. The IPC uses the engine speed signal circuit 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 exists.
Voltmeter
The IPC displays the system voltage as detected at the ignition 1
voltage input of the IPC. When the engine is ON, the gage should be between
10 and 16 volts.
