| Table 1: | IPC Indicators |
| Table 2: | DIC Indicators |
Symbol | Description |
|---|---|
| Charge: Refer to Charging System Description and Operation in Engine Electrical |
CHECK GAGES | Check Gages: Refer to Indicator/Warning Message Description and Operation |
| High Beam: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
| Turn Signals: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
Symbol | Description |
|---|---|
| ABS: Refer to ABS Description and Operation in Antilock Brake System or to Air ABS Description and Operation in Air Antilock Brake System |
AUX BRAKE | Aux Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes |
CHANGE OIL | Change Oil: Refer to Indicator/Warning Message Description and Operation |
CHECK TRANS | Check Transmission: Refer to Indicator/Warning Message Description and Operation |
| DRL: Refer to Exterior Lighting Systems Description and Operation in Lighting Systems |
ENGINE OVERSPEED | Engine Overspeed: Refer to Indicator/Warning Message Description and Operation |
HIGH IDLE | High Idle: Refer to Indicator/Warning Message Description and Operation |
INTAKE HEATER | Intake Heater: Refer to the Cat® Medium Duty Diesel Manual - LG 5 |
LOW AIR | Low Air Brake Pressure: Refer to Brake Warning System Description and Operation in Air Brakes |
LOW COOLANT | Low Coolant: Refer to Cooling System Description and Operation in Engine Cooling |
PARK BRAKE | Park Brake: Refer to Park Brake System Description and Operation in Park Brake |
|
PRIMARY BRAKE | Primary Brake: Refer to Brake Warning System Description and Operation in Hydraulic Brakes |
REDUCED ENGINE POWER | Reduced Engine Power: Refer to Indicator/Warning Message Description and Operation |
SERVICE ENGINE SOON | Malfunction Indicator Lamp: Refer to Powertrain Control Module Description in Engine Controls - 8.1 L or to the Cat® Medium Duty Diesel Manual - LG 5 |
Change Oil
The CHANGE OIL indicator illuminates in the driver information center (DIC) when the powertrain control module (PCM) determines that the engine oil should be changed. The PCM grounds the change oil indicator control circuit in order to illuminate the CHANGE OIL indicator. After the engine oil is changed, reset the engine oil monitor . Refer to GM Oil Life System Resetting in Maintenance and Lubrication.
Check Gages (L18)
The CHECK GAGES indicator illuminates in the IPC when one of the following occurs:
| • | The PCM detects that the engine oil pressure is approximately 5 psi (34 kPa) or below. |
| The PCM monitors the signal circuit of the engine oil pressure sensor. |
| • | The PCM detects that the engine coolant temperature is approximately 107°C (225°F) or above. |
| The PCM monitors the signal circuit of the engine coolant temperature sensor. |
The PCM grounds the check gages indicator control circuit in order to illuminate the CHECK GAGES indicator.
The MFAM receives a direct hardwire input from the PCM and the engine will be shutdown, on vehicles equipped with automatic engine shutdown, when one of the following conditions exist:
| • | The PCM detects that the engine coolant temperature is at or above 111°C (232°F). |
| • | The PCM detects that the engine oil pressure is at or below 34 kPa (5 psi). |
The MFAM grounds the stop lamp switch signal circuit in order to shut the engine down.
Check Gages (LG5)
The CHECK GAGES indicator illuminates in the IPC when one of the following occurs:
| • | The MFAM detects that the engine oil pressure is approximately 5 psi (34 kPa) or below. |
| The MFAM monitors the signal circuit of the engine oil pressure switch. |
| • | The MFAM detects that the engine coolant temperature is approximately 107°C (225°F) or above. |
| The MFAM monitors the signal circuit of the engine coolant temperature switch. |
The MFAM grounds the check gages indicator control circuit in order to illuminate the CHECK GAGES indicator.
The engine will be shutdown, On vehicles equipped with automatic engine shutdown, when one of the following conditions exist:
| • | The MFAM detects that the engine coolant temperature is at or above 111°C (232°F). |
| • | The MFAM detects that the engine oil pressure is at or below 34 kPa (5 psi). |
The MFAM provides a ground for the stop lamp switch interface module in order to shut the engine down.
Check Transmission
The CHECK TRANS indicator illuminates in the DIC when the transmission control module (TCM) detects certain malfunctions in the transmission. The TCM grounds the check trans indicator control circuit in order to illuminate the CHECK TRANS indicator.
Engine Overspeed
The ENGINE OVERSPEED indicator illuminates in the DIC when the PCM detects that the engine speed is between 3,600-4,000 RPM. The PCM grounds the engine overspeed indicator control circuit in order to illuminate the ENGINE OVERSPEED indicator.
High Idle
The HIGH IDLE indicator illuminates in the DIC when the PCM detects that the high idle button is pressed and the high idle system is engaged. The PCM grounds the high idle indicator control circuit in order to illuminate the HIGH IDLE indicator.
Reduced Engine Power
The REDUCED ENGINE POWER indicator illuminates in the DIC when the PCM detects a malfunction in the throttle actuator control (TAC) system. The PCM grounds the reduced engine power indicator control circuit in order to illuminate the REDUCED ENGINE POWER indicator.
