Scan Tool Testing and Procedures

Scan Tool Diagnostics
A scan tool is a very useful tool and must be used when referred. In addition to displaying DTCs, the scan tool is capable of displaying input status and the data values the TPM system uses to perform certain functions. It is also capable of sending specific commands to other systems to determine if the malfunction is due to the TPM system not sending a proper command, or the system that received the command is not responding to the command. Using the left front tire pressure display as an example, if the IPC is displaying the left front tire pressure incorrectly. Select RFA and monitor the left front tire pressure data with a scan tool, this will determine if the receiver is actually reading the correct data from the sensor. If the TPM system is displaying the correct data value for the left front tire and the IPC is not, the problem could be with IPC not receiving and/or interpreting the proper information.








RFA/TPM Scan Tool Data List

RFA/TPM Scan Tool Data Definitions
The RFA/TPM Scan Tool Data Definitions contains a brief description of all RFA/TPM related parameters available on the scan tool.

Point of Sale: The scan tool displays the country the vehicle was sold in.

Software ID: The scan tool displays the receiver software ID number for service identification.

Key In Ignition: The scan tool displays Yes or No. The RFA system receives this information on the serial data line from the BCM. When the key is IN the ignition switch, the scan tool will display Yes. When the key is removed from the ignition switch, the scan tool will display No.

Invalid Key Fob: The scan tool displays Yes or No. If an invalid transmitter is within range, and a button is pressed, the scan tool will display Yes. If a valid transmitter is in range, and a button is pressed, the scan tool will display No.

Valid Key Fob: The scan tool displays Yes or No. If an valid transmitter is in range, and a button is pressed, the scan tool will display Yes. If an invalid transmitter is in range, and a button is pressed, the scan tool will display No.

Keyless Entry Option: The scan tool displays On or Off. This information is programmed into the BCM RPO content and sent on the serial data line. If the keyless entry option is programmed into the BCM, the scan tool will display Yes. If not, the scan tool will display No.

Current Power Mode: The scan tool displays the current power mode. The BCM determines ignition switch position from it's ignition inputs. This ignition switch information is sent on the serial data line to systems that relay on this information to perform certain functions (RAP, wake-up, etc.).

Class 2 Disable: The scan tool displays Yes or No. If the RFA system cannot communicate on the serial data line, the scan tool will display Yes. If the RFA system can communicate, the scan tool will display No.

Programmed Key Fobs: The scan tool displays 1 to 3. The scan tool displays the amount of valid transmitters programmed in the keyless entry receiver.

LF Tire Pressure: The scan tool displays 0-1020 kPa (0-148 psi). The scan tool displays tire pressure data received from the LF tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and LF tire pressure sensor information is received.

LR Tire Pressure: The scan tool displays 0 - 1020 kPa (0 - 148 psi). The scan tool displays tire pressure data received from the LR tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and LR tire pressure sensor information is received.

RF Tire Pressure: The scan tool displays 0 - 1020 kPa (0 - 148 psi). The scan tool displays tire pressure data received from the RF tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and RF tire pressure sensor information is received.

RR Tire Pressure: The scan tool displays 0 - 1020 kPa (0 - 148 psi). The scan tool displays tire pressure data received from the RR tire pressure sensor. The scan tool will display 1020 kPa (148 psi) until the vehicle is driven and RR tire pressure sensor information is received.

LF Tire Status: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and LF tire pressure sensor information is received. When LF tire pressure information is received, the LF tire status will change to OK.

RF Tire Status: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and RF tire pressure sensor information is received. When RF tire pressure information is received, the RF tire status will change to OK.

RR Tire Status: The scan tool displays Data Pending or OK. The scan tool displays Data Pending until the vehicle is driven and RR tire pressure sensor information is received. When RR tire pressure information is received, the RR tire status will change to OK.

LR Tire Status: The scan tool displays Data Pending or OK The scan tool displays Data Pending until the vehicle is driven and LR tire pressure sensor information is received. When LR tire pressure information is received, the LR tire status will change to OK.