Virtual Gauges

Air Fuel Ratio

The air fuel ratio gauge is a virtual gauge with an additional numeric display ranging between 10 and 20 that is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The IPC receives the air fuel ratio display message from the GWM over the HS-CAN3. The GWM receives the air fuel ratio display message from the PCM over the HS-CAN1.

Axle Fluid Temperature

The axle fluid temperature gauge is a virtual gauge with an additional numeric display ranging between 50-175 deg. C (122-350 deg. F) and is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The IPC receives the rear differential fluid temperature data from the GWM over the HS-CAN3. The GWM receives the rear differential fluid temperature data from the PCM over the HS-CAN1.

Battery Voltage (Analog IPC and Digital IPC With 5.0L and 2.3L Performance Package)

NOTE: The vehicle uses a smart charging system algorithm based on driving and battery state of charge. The display voltage may fluctuate when the system transitions from one state to another.

The battery voltage gauge is a virtual gauge with an additional numeric display ranging between 8 and 18 volts that is selected using the message center switch. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The battery voltage gauge uses the voltage input as measured on the hardwired hot at all times voltage input.

Cylinder Head Temperature

The cylinder head temperature gauge is a virtual gauge with an additional numeric display ranging between 60-160 deg. C (140-340 deg. F) (except GT350) or 50-200 deg. C (150-400 deg. F) (GT350) that is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The IPC receives the cylinder head temperature data message from the GWM over the HS-CAN3. The GWM receives the cylinder head temperature data message from the PCM over the HS-CAN1.

Engine Oil Pressure (Digital IPC With 5.0L and 2.3L Performance Package)

The engine oil pressure gauge is a virtual gauge with an additional numeric display ranging between 0-150 PSI that is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The IPC receives the oil pressure warning indicator request from the GWM over the HS-CAN3. The GWM receives the oil pressure warning indicator request from the PCM over the HS-CAN1.

Engine Oil Temperature (Analog IPC)

The engine oil temperature gauge is a virtual gauge with an additional numeric display that is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The engine oil temperature gauge display ranges as follows:

38-60 deg. C (100-140 deg. F) (low)
61-137 deg. C (142-279 deg. F) (normal)
138-146 deg. C (279-295 deg. F) (warm)
147-160 deg. C (297-320 deg. F) (hot)

The IPC receives the oil temperature warning indicator message from the GWM over the HS-CAN3. The GWM receives the oil temperature warning indicator message from the PCM over the HS-CAN1.

Fuel Gauge (Digital IPC)

The IPC sends a reference voltage to the fuel level sender(s). As the fuel level changes, a float actuates the variable resistor fuel level sender, raising or lowering the fuel level signal voltage. The IPC monitors the changes in voltage from both senders and commands the fuel gauge with a corresponding movement of the pointer.

After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in and the amount of fuel added.

The IPC uses 4 different operating modes to calculate the fuel level:

Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery

Anti-Slosh Mode

The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sensor readings caused by fuel moving around in the tank), the fuel gauge takes approximately 40 minutes to go from empty (E) to full (F).

Key OFF Fueling Mode

The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions to be met:

The ignition must be in the OFF mode when refueling the vehicle.
At least 6% of the vehicle's fuel capacity must be added to the fuel tank.
The IPC must receive a valid ignition ON fuel sensor reading within one second of the ignition being put into the RUN mode. The key ON sample readings are considered valid if the fuel sensor reading is between 10 ohms +/- 2 ohms and 180 ohms +/- 4 ohms.

If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.

Key ON Fueling Mode

In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) or NEUTRAL (N) position. When the 30-second time has elapsed and at least 9% of the vehicle's fuel capacity has been added, the fuel gauge response time is 60 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P) or NEUTRAL (N), the fuel gauge strategy reverts to the anti-slosh mode. The key ON fueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the ignition in the RUN mode.

The key ON fueling mode (approximately 60 seconds to read empty [E] to full [F]) requires the following conditions be met:

The transmission is in PARK (P) or NEUTRAL (N).
The ignition is in the RUN mode.
At least 6% of the vehicle's fuel capacity must be added to the fuel tank

Recovery Mode

Recovery mode is incorporated into the IPC strategy to recover from a missing fuel level input after a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sensor or its circuits. Recovery mode (empty [E] to full [F] approximately 17 minutes) is initiated when the following 2 conditions are met:

The IPC is in the anti-slosh (default) mode.
The actual fuel level in the tank is 5% different from what is being displayed by the fuel gauge.

Inlet Air Temperature

The air inlet temperature gauge is a virtual gauge with an additional numeric display ranging between -20-120 deg. C (0-240 deg. F) and is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The IPC receives the engine air inlet temperature data from the GWM over the HS-CAN3. The GWM receives the engine air inlet temperature data from the PCM over the HS-CAN1.

Speedometer (Digital IPC)

The PCM receives the wheel speed data from the GWM over the HS-CAN1. The GWM receives the wheel speed data from the ABS module over the HS-CAN2. The PCM uses tire size stored in the vehicle configuration file along with wheel speed inputs to generate a vehicle speed signal.

The IPC receives the vehicle speed message from the GWM over the HS-CAN3. The GWM receives the vehicle speed message from the PCM over the HS-CAN1.

The IPC provides a tolerance that allows the speed indication to display between 3% below and 7% above the actual vehicle speed. This means that with an actual vehicle speed of 97 km/h (60 mph), the speedometer can indicate between 94-103 km/h (58-64 mph). Incorrect tire size or tire size configuration could potentially affect the speedometer accuracy.

Tachometer (Digital IPC)

The IPC receives the engine rpm data message from the GWM over the HS-CAN3. The GWM receives the engine rpm data message from the PCM over the HS-CAN1.

Temperature (Digital IPC)

The IPC uses 2 messages to control the temperature gauge. The first is the engine coolant temperature data, which provides the current engine temperature input to the PCM. The second message is the engine overheat indication request, which is sent by the PCM to the IPC when an overheating condition exists. When the IPC receives the engine overheat indication request message, the IPC sends the temperature gauge to full hot and turns on the over-temperature warning indicator.

The IPC receives both temperature gauge inputs from the GWM over the HS-CAN3. The GWM receives the engine coolant temperature data and the engine overheat indication request messages from the PCM over the HS-CAN1.

Transmission Fluid Temperature

The transmission fluid temperature gauge is a virtual gauge with an additional numeric display that is selected through the message center. For the virtual gauge display navigation, see the message center menu options in the Owner's Literature. The transmission temperature gauge ranges as follows:

24-49 deg. C (76-120 deg. F) (low)
50-120 deg. C (122-248 deg. F) (normal)
121-134 deg. C (249-273 deg. F) (warm)
135-193 deg. C (275-379 deg. F) (hot)

The GT350 transmission fluid temperature gauge display ranges between 50-175 deg. C (122-350 deg. F).

The IPC receives the transmission fluid temperature data from the GWM over the HS-CAN3. The GWM receives the transmission fluid temperature data from the PCM over the HS-CAN1.

Vacuum

The vacuum gauge is a virtual gauge with an additional numeric display ranging between 0-30 Hg (vacuum range) and is selected through the message center. For the virtual gauge displays, see the message center menu options in the Owner's Literature. The IPC receives the vacuum boost display message from the GWM over the HS-CAN3. The GWM receives the vacuum boost display message from the PCM over the HS-CAN1.

Vacuum-Boost

The vacuum-boost gauge is a virtual gauge with an additional numeric display ranging between 0-30 Hg (vacuum range) and 0-30 PSI (boost range) and is selected through the message center. For the virtual gauge displays, see the message center menu options in the Owner's Literature. The IPC receives the vacuum boost display message from the GWM over the HS-CAN3. The GWM receives the vacuum boost display message from the PCM over the HS-CAN1.