Displays Test
Certain instrument panel cluster (IPC) features are tested when the ignition
is turned on in order to verify that the features are working properly. The following
indicators illuminate briefly at key up:
| • | Air bag--Flashes 7 times |
| • | Engine Coolant Temperature |
| • | Low oil pressure indicator |
| • | Malfunction indicator lamp (MIL)--Check engine |
| • | Reduced Engine Power indicator |
| • | Service Vehicle Soon indicator |
| • | Upshift indicator (manual transmission) |
Indicators and Warning Messages
Refer to
Indicator/Warning Message Description and Operation
.
Engine Coolant Temperature Gage
The engine control module (ECM) sends coolant temperature as determined by the
coolant temperature sensor to the body control module (BCM) via the controller area
network (CAN) serial data. The instrument panel cluster (IPC) displays the engine
coolant temperature with the gage when the BCM sends a class 2 message to the
IPC indicating coolant temperature percentage. The engine coolant temperature (ECT)
gage defaults to cold (0°) or below if:
| • | The ECM detects a malfunction in the ECT sensor circuit. |
| • | The IPC detects a loss of class 2 communications with the BCM. |
| • | The BCM detects a loss of CAN communications with the ECM. |
Fuel Gage
The engine control module (ECM) sends fuel level percent to the body control
module (BCM) via the controller area network (CAN) serial data. The instrument panel
cluster (IPC) displays the fuel level as determined by the BCM. The fuel gage defaults
to E (empty) if:
| • | The ECM detects a malfunction in the fuel level sensor circuit. |
| • | The IPC detects a loss of class 2 communications with the BCM. |
| • | The BCM detects a loss of CAN communications with the ECM. |
When the fuel level is less than a pre-determined value, the Low Fuel indicator
message illuminates.
Odometer
The odometer shows how far the vehicle has been driven, in either miles (domestic)
or kilometers (export). The odometer is shown on display when any of the following
occur:
| • | Ignition is in RUN, with no messages On |
| • | The trip reset stem is pressed with the ignition OFF |
Odometer readings are displayed in the instrument panel cluster (IPC) based
on a class 2 message from the body control module (BCM). The engine control
module (ECM) calculates the distance traveled from the vehicle speed sensor (VSS)
input. The BCM receives a controlled area network (CAN) serial data message from the
ECM and stores the current mileage.
The IPC stores the last valid odometer reading from the BCM in non-volatile
memory. When a new valid odometer reading is received from the BCM, the IPC will update
the display and store the new reading.
The IPC also receives class 2 messages from the BCM regarding VIN and
vehicle content information. Valid information is stored in non-volatile memory at
the first key-up with a new IPC. If the VIN or option content do not match the stored
information, the odometer will display ERROR.
Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information
from the body control module (BCM). The engine control module (ECM) calculates the
vehicle speed based on the controlled area network (CAN) serial data message indicating
the wheel reference speed from the electronic brake control module (EBCM). The ECM
sends a CAN serial data message to the BCM indicating the vehicle speed. The BCM sends
a class 2 message to the IPC indicating the vehicle speed.
The speedometer defaults to 0 km/h (0 mph) when any of the following
occur:
| • | The EBCM detects a malfunction in the vehicle speed sensor circuit. |
| • | The ECM detects a loss of CAN communications with the EBCM. |
| • | The BCM detects a loss of CAN communications with the ECM. |
| • | The IPC detects a loss of class 2 communications with the BCM. |
Tachometer
The instrument panel cluster (IPC) displays the engine speed as determined by
the body control module (BCM) via a class 2 message. The engine control module
(ECM) determines the engine speed and sends a controlled area network (CAN) serial
data message to the BCM indicating the engine speed. The tachometer will default to
0 RPM if:
| • | The ECM detects a malfunction in the engine speed sensor circuit. |
| • | The BCM detects a loss of CAN communications with the ECM. |
| • | The IPC detects a loss of class 2 communications with the BCM. |
Trip Odometer
Trip odometer readings are calculated by the instrument panel cluster (IPC)
based on the odometer reading received through a class 2 message from the body
control module (BCM). The trip odometer is shown when selected with the odometer trip
reset stem. To reset the trip odometer, press and hold the trip reset stem for about
2 seconds, until the trip odometer shows zero.
