GS-340e (PT40) On Road ECM Device

1. Verifying the Correct Harness

Ensure that you are using the correct cable harness based on the type of vehicle you're working with. Below is a list of the harnesses and their appropriate vehicles:

For On-Road HD Trucks:

J1939 Type 1 or 2 (e.g., Peterbilt, Kenworth, etc. – NOT for MACK/VOLVO)
- Cable Part # PT4Y9GB15

For Light/Medium Pickup Trucks:

OBD II (e.g., Ford, Chevy, etc. – NOT for MACK/VOLVO)
- Cable Part # PT4YOL15

For HD Trucks with OBDII:

OBD II (J1962) (Compatible with Mack, Volvo, and other HD trucks with OBDII)
- Cable Part # PT4YOV15

For Older HD Trucks (Typically 1995-2005):

J1708 (Older HD trucks)
- Cable Part # PT4Y6GY15

For Newer HD Trucks (Typically 2021/2022):

RP1226 (Note: Not all trucks come with this system, so it’s important to verify compatibility)
- Cable Part # PT4S122615

Make sure to check the vehicle’s specifications and match it with the correct cable to avoid connection issues.

2. Verifying the Unit Light Status

The GS-340e LED lights indicate the current status of different functions. Understanding these lights is essential for troubleshooting.

Orange LED (GPS Status):

Off: GPS power management is engaged. GPS is turned off, but the GPS backup clock remains ON.
Blinking: GPS is in acquisition mode, searching for a signal.
On: GPS signal is locked and active, ready to use.

Green LED (Vehicle Connection Status):

Off: No vehicle connection is active.
Blinking: The device is temporarily negotiating communication on the vehicle bus.
On: The device is connected to the vehicle and actively receiving data.

Blue LED (Cellular Connection Status):

Off: The cellular subsystem is off.
Blinking (10s): The cellular subsystem is not actively searching.
Fast Blink: The cellular network has rejected the device.
Slow Blink: The cellular subsystem is searching for a network.
On: The cellular subsystem is successfully connected to a network.

3. Troubleshooting Tips

Device Placement and Signal Quality:

The Device Shouldn't Be Hidden in a Metal Box: Metal enclosures can interfere with both cellular and satellite signals. Make sure the device is in an open space with a clear line of sight to both the sky (for GPS) and the nearest cell towers (for cellular connection).
Couple the Unit with the Correct Equipment on the Website: Ensure that the device is properly configured with the correct vehicle type and system on the website for accurate data collection and transmission.
If the Equipment is in the Shop: For better cellular and satellite reception, move the device to a location such as the yard where signals are typically stronger, if possible. Avoid locations with limited signal coverage (such as inside a building or underground).

General Troubleshooting Checklist:

Verify Cable Compatibility: Ensure the correct harness is being used for your vehicle type. Double-check the cable part numbers listed above to avoid mismatches.
Check LED Lights: Monitor the LED lights to understand the current status of GPS, vehicle connection, and cellular subsystem. Refer to the light status section for specific indications.
Proper Placement: Confirm that the device is not obstructed by metal or other interference that could block GPS and cellular signals.
Network Coverage: Ensure the device is within the coverage area for cellular (Verizon/AT&T) and has a clear view of the sky for GPS signal.