Typical Scan Tool Data Definitions

The instrument Panel Cluster (IPC) Scan Tool Data Display Values and Definition information can assist in diagnosing instrument Panel Cluster related problems, especially when no Diagnostic Trouble Codes (DTC) are stored in memory. A vehicle's scan tool data can be compared with the data display values from a known good vehicle in the Scan Tool Data Display Table. When data from the vehicle differs from the typical data display value, the data definition information will help in understanding the nature of the difference and the source of the problem.

DATA
Vehicle Speed - Range: 0 MPH - 120 MPH

This data is the cluster's measurement of the vehicle's speed from a discrete input from the PCM/VCM.

Engine Speed - Range: 0 RPM - 7,000 RPM

This data is the cluster's measurement of the engine speed in Revolutions Per Minute (RPM) from a discrete input from the PCM/VCM.

Monitored Coolant Temperature - Range: -40 °F - 419 °F

This data is the cluster's measurement of the engine coolant temperature as provided by the VCM/PCM on the Class 2 serial data line. If a Class 2 communication failure occurs, this data will be -40.

Displayed Coolant Temperature - Range: 90 °F - 260 °F

This data is the coolant temperature the IPC is attempting to display on the coolant temperature gage. It may differ from the monitored coolant temperature for a period of time due to filtering. It may also differ from the monitored coolant temperature when coolant temperature is not in the range of 90 - 260 °F since the display is limited to these values. If a Class 2 communication failure occurs, this data will be at its minimum value of 90.

Monitored Fuel Level - Range: 0% - 100%

This data is the cluster's measurement of the fuel tank level as provided by the VCM/PCM on the Class 2 serial data line. If a Class 2 communication failure occurs, this data will be 0.

Displayed Fuel Level - Range: 0% - 100%

This data is the fuel level the IPC is attempting to display on the fuel gage. It may differ from the monitored fuel level for a period of time due to filtering. If a Class 2 communication failure occurs, this data will be 0.

Displayed Odometer Mile - 0 Miles - 999,999 Miles

This data refers to the displayed Odometer mileage on the Odometer display.

Displayed Trip Odometer - Range: 0 Miles - 9,999.9 Miles

This data refers to the displayed Trip Odometer mileage displayed on the Trip Odometer display.

Battery Voltage - Range: 9.0 Volts - 19.0 Volts

This data refers to the battery system voltage as measured by the IPC.

INPUTS
PRNDL State - Range: Park / Reverse / Neutral / Drive / Third / Second / First / Invalid
This data input refers to the PRNDL position data that is communicated to the cluster over the Class 2 serial data line by the PCM/VCM. The value of this parameter corresponds to the gear that is selected on the PRNDL display. The value of this parameter will be INVALID under the following conditions:
- The data from the PCM/VCM is INVALID.
- The data from the PCM/VCM is PARK but the cluster does not see ground on its park switch input (pin A12).
- The data from the PCM/VCM is not PARK but the cluster sees ground on its park switch input (pin A12).
- A Class 2 communication failure has occurred.

When the value of this parameter is INVALID, no gear will be shown as selected on the PRNDL display.

Dimming - Range: Active / Inactive

This data refers to the dimming availability feature of the PRNDL and Odometer/Trip Odometer vacuum florescent displays. ACTIVE is displayed when the Park Lamps are ON and then the PRNDL and Odometer/Trip Odometer vacuum florescent displays can be dimmed using the dimming thumbwheel switch. INACTIVE is displayed when the Park Lamps are OFF and the PRNDL and Odometer/Trip Odometer vacuum florescent displays cannot be dimmed using the dimming thumbwheel displays.

Park Switch - Range: Open / Closed

This data input refers to the state of the gear shift PARK position switch. OPEN is displayed when the gear shift is not in park. CLOSED is displayed when the gear shift is in the PARK position and the gearshift lever is at it's normal rest position.

Trip Reset Switch - Range: Active / Inactive

This data refers to the position of the Trip Odometer Reset switch. ACTIVE is displayed when the Trip Reset switch is pushed in. INACTIVE is displayed when the Trip Reset switch is in it's normal position (not pushed in).

OUTPUTS
Check Gauges Lamp - Range: ON / OFF

This output refers to the commanded state of the CHECK GAGES lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the CHECK GAGES lamp to be illuminated when 1) it receives a high Engine Coolant Temperature (greater than 248(F) Class 2 message from the VCM/PCM, 2) a Low Oil Pressure signal (less than 5 ohms) from the oil pressure sender when the engine is running or 3) during the bulb check period for 3 seconds after the ignition switch is first turned to RUN. OFF is displayed when the IPC module is not commanding the CHECK GAGES lamp to be illuminated.

Low Fuel Lamp - Range: ON / OFF

This output refers to the commanded state of the LOW FUEL lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the LOW FUEL lamp to be illuminated. OFF is displayed when the IPC module is not commanding the LOW FUEL lamp to be illuminated. The IPC will command the LOW FUEL lamp to be illuminated under the following conditions:
- It receives a Class 2 (% Monitored Fuel Level) message of less than 19.2 % from the PCM/VCM. Note that once the lamp is on, the Monitored Fuel Level must rise above 23% in order to turn it off.
- During the bulb check period after the ignition switch is first turned to RUN.
- A Class 2 communication failure has occurred.

Service 4WD - Range: ON / OFF

This output refers to the commanded state of the SERVICE 4WD lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the SERVICE 4WD lamp to be illuminated when it receives a Class 2 message from the Automatic Transfer Case (ATC) module. OFF is displayed when the IPC module is not commanding the SERVICE 4WD lamp to be illuminated.

Overspeed Lamp - Range: ON / OFF (Export Vehicle Only)

This output refers to the commanded state of the OVERSPEED lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the OVERSPEED lamp to flash when a Class 2 message is received from the PCM/VCM. OFF is displayed when the IPC module is not commanding the OVERSPEED lamp to be illuminated.

ABS Lamp - Range: ON / OFF

This output refers to the commanded state of the ABS lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the ABS lamp to be illuminated. OFF is displayed when the IPC module is not commanding the ABS lamp to be illuminated. The IPC will command the ABS lamp to be illuminated under the following conditions:
- It receives a Class 2 message from the Electronic Brake Control Module (EBCM) indicating there is a malfunction in the ABS system.
- During the bulb check period for 3 seconds after the ignition switch is first turned to RUN.
- A Class 2 communication failure occurs.

Brake Lamp - Range: ON / OFF

This output refers to the commanded state of the BRAKE lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the BRAKE lamp to be illuminated when 1) it receives a Class 2 message from the Body Control Module (BCM) that the Park Brake is set, 2) it receives a Class 2 message from the Electronic Brake Control Module (EBCM) that there is a problem with the base brake system (non-ABS portion) or, 3) during the bulb check period for 3 seconds after the ignition switch is first turned to RUN. OFF is displayed when the IPC module is not commanding the BRAKE lamp to be illuminated.

Fasten Seat Belts - Range: ON / OFF

This output refers to the commanded state of the FASTEN SEAT BELTS lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the FASTEN SEAT BELTS lamp to be illuminated for 20 seconds followed by 55 seconds flashing when it receives a Class 2 message from the Body Control Module (BCM) that the driver's seat belt is not buckled or 2) during the bulb check period for about 3 seconds after the ignition switch is first turned to RUN providing the driver's seat belt is buckled. OFF is displayed when the IPC module is not commanding the FASTEN SEAT BELTS lamp to be illuminated.

Security Lamp - Range: ON / OFF

This output refers to the commanded state of the SECURITY lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the SECURITY lamp to be illuminated. OFF is displayed when the IPC module is not commanding the SECURITY lamp to be illuminated. The IPC will command the SECURITY lamp to be illuminated under the following conditions:
- It receives a Class 2 message from the Body Control Module (BCM).
- During the bulb check period for about 3 seconds after the ignition switch is first turned to RUN.
- A Class 2 communication failure occurs.

Rear Gate / Door - Range: OPEN / CLOSED

This output refers to the commanded state of the REAR GATE / DOOR lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the REAR GATE / DOOR lamp to be illuminated when it receives a Class 2 message from the Body Control Module (BCM). OFF is displayed when the IPC module is not commanding the REAR GATE / DOOR lamp to be illuminated.

Upshift Lamp - Range: ON / OFF (Manual Transmission Vehicle Only)

This output refers to the commanded state of the UPSHIFT lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the UPSHIFT lamp to be illuminated when it receives a Class 2 message from the PCM/VCM. OFF is displayed when the IPC module is not commanding the UPSHIFT lamp to be illuminated.

High Beam Lamp - Range: ON / OFF

This output refers to the commanded state of the High Beam lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the High Beam lamp to be illuminated when it receives a Class 2 message from the Body Control Module (BCM). OFF is displayed when the IPC module is not commanding the High Beam lamp to be illuminated.

Battery - Range: ON / OFF

This output refers to the commanded state of the BATTERY (Voltage) lamp illumination by the IPC module. ON is displayed when the IPC module is commanding the BATTERY lamp to be illuminated. OFF is displayed when the IPC module is not commanding the BATTERY lamp to be illuminated. The IPC will command the BATTERY lamp to be illuminated under the following conditions:
- It receives a Class 2 message from the PCM/VCM indicating that there is a charging system problem.
- The ignition switch is turned to UNLOCK or RUN without the engine running.
- A Class 2 communication failure occurs.