INTERMOTIVE TG752 2020-2021 Ram Promaster Instructions
- June 3, 2024
- INTERMOTIVE
Table of Contents
**INTERMOTIVE TG752 2020-2021 Ram Promaster Instructions
**
System Overview
Introduction
TG752 serves as a means of monitoring engine coolant temperature (ECT) and notifying the vehicle operator that the vehicle’s ECT has reached abnormally high levels. TG752 will alert the vehicle operator that ECT levels have reached/ surpassed a (configurable) temperature threshold by lighting up an LED and will flash a second LED if ECT goes above an even higher temperature. A piezo buzzer will also chime when ECT surpasses the thresholds. The LEDs and buzzer will alert as long as ECT levels stay above the temperature threshold (for a set amount of time) and go OFF once ECT levels stay below a temperature threshold for a set amount of time.
IMPORTANT — READ BEFORE INSTALLATION
It is the installer’s responsibility to route and secure all wiring harnesses
where they cannot be damaged by sharp objects, mechanical moving parts and
high heat sources. Failure to do so could result in damage to the system or
vehicle and create possible safety concerns for the operator and passengers.
Avoid placing the module where it could encounter strong magnetic fields from high current cabling connected to motors, solenoids, etc. Avoid radio frequency energy from antennas or inverters next to the module. Avoid high voltage spikes in vehicle wiring by always using diode clamped relays and solenoids when installing up fitter circuits.
CAUTION
All electronic products are susceptible to damage from Electrostatic Discharge
or ESD. Ground yourself before handling or working with the module and
harnessing by first touching chassis ground, such as the barrel of the
cigarette lighter.
Installation Instructions
Disconnect vehicle battery before proceeding with installation.
TG752 Module
Remove the lower dash panel below the steering column and find a suitable location to mount the module. Locate the module in an area away from excessive heat sources (engine, heater ducts, etc.). Ensure when routing harnesses that the tilt steering column does not contact them in the full down position. When installing the harnesses, leave several inches of take-out so the module can be removed if necessary. Do not mount module until all wire harnesses are routed and secure. The last step of the installation is to mount the module.
Data Link Harness — 4 pin connector
The Promaster has an OEM Gateway module located behind the glovebox. Follow
the steps below to access it:
- Open the glovebox door.
- Locate the 2 release tabs on the inside of the glovebox (one on the left and one on the right) and drop the door into the full down position.
- Locate the two fasteners securing the glovebox assembly to the vehicle and remove them.
- Locate the 4 fasteners on the outside of the glovebox assembly and remove them.
- Remove the glove box assembly.
- The Gateway module is located behind the glove box assembly as shown in the picture.
- Remove the 12-pin and 8-pin connectors from the Gateway module and plug in the 12-pin and 8-pin connectors from the Intermotive TG752 Data Link harness. Plug the OEM 12-pin and 8-pin connectors into the mating connectors on the TG752 Data Link harness.
- Plug the free end of the 4-pin Data Link harness into the mating 4-pin connector on the 4 foot extension harness.
Plug the other end of the extension harness into the mating 4-pin connector on the TG752 module.
I/O Installation and Description (J3 8-Pin Connector)
LED Indicator
Mount the LED indicator on the dash in view of the driver
Buzzer
Mount the buzzer in a location that is close enough for the driver to hear,
even when the engine is on.
Plug the 8-pin connector into the mate on the TG752 module at location J3.
8-Pin Output Connector (J3) Definition
- Pin #1— output to buzzer
- Pin #2— output to LED indicator
- Pin #3— output to LED indicator
- Pin #4— not used
- Pin #5— not used
- Pin #6— output to LED indicator
- Pin #7— output to LED indicator
- Pin #8— not used
System Operation
While the Key is in the RUN position, TG752 monitors the vehicle’s ECT. TG752 operates in one of three states depending on the engine coolant temperature reading.
State 1
TG752 monitors CAN traffic and checks whether ECT has reached a threshold
value (defaulted at 228 deg F (109 deg C)). If ECT stays below 228F or if key
position is not in RUN, TG752 will remain in the first state and both LEDs and
the buzzer will remain OFF.
State 2
Once TG752 detects that ECT has reached 228 deg F (and has stayed at or
above that threshold temperature for at least 30 seconds) the “HIGH COOLANT
TEMP” LED will illuminate (solid) and stay illuminated. The buzzer alarm
sounds off periodically at a configurable rate. The described conditions are
present as long as ECT stays at or above 228 F, and the key is in the RUN
position. Note: In order to transition back to state 1 (both LEDs OFF), the
ECT value reported by the vehicle must stay below 228F for at least 30 seconds
or the key needs to be rolled to a position other than RUN.
State 3
If ECT continues to increase and reaches a second threshold temperature
(defaulted at 230 deg F (110 deg C)), TG752 will illuminate (blinking) the
“ENGINE WARNING” LED (if ECT has been at or above that threshold temperature
for at least 30 seconds). The buzzer alarm chimes at a faster rate when in
this state. As long at ECT stays at or above 230 deg F with the key in RUN,
the solid LED and blinking LED will continue to be illuminated and the buzzer
will be on constantly.
Diagnostics
The module can be put into its diagnostic mode by pressing the RED test button
(SW1). Each time the button is pressed the next sequential page is selected.
There are 2 pages currently defined, and each page uses the on-board LEDs
(1-4) and STATUS LED to display status. The STATUS LED will “blink out” the
currently selected page:
PAGE 1 – displays status of VIN, ECT PID reception, and ECT Warning LEDs. Putting the module in this state also reduces the hysteresis time from 30 seconds to 1 second:
- LED 1 – ON when Valid VIN received
- LED 2 – ON when receiving ECT data from the vehicle
- LED 3 – ON when ECT has surpassed threshold to turn on solid LED
- LED 4 – BLINKING when ECT has surpassed threshold to turn on blinking LED
- STATUS – blinks out currently selected page
PAGE 2 – Diagnostic Test. Used to verify module functionality without having to actually overheat a Dodge ProMaster. With the vehicle’s engine is off, the user would put the module into diagnostic page 2 and then start the engine. If the vehicle ECT is below 160 deg F (71 deg C), the module will read and save the current ECT value. It will add three degrees to the saved value and use it as the 1st threshold value (above which SOLID LED turns ON). It will add 4 degrees to the saved value and use that as the 2nd threshold value (above which BLNKING LED turns ON). These temporary threshold values are reset to the default values after the user exits diagnostic page 2. If the ECT is above 60 deg C when the user goes to this page, all module LEDs will flash to indicate that the vehicle needs to cool down before performing this diagnostic test. Putting the module in this state also reduces the hysteresis time from 30 seconds to 1 second:
- LED 1 – always OFF
- LED 2 – always OFF
- LED 3 – ON (solid) when ECT has surpassed 1st (temporary) threshold
- LED 4 – ON (blinking) when ECT has surpassed 2nd (temporary) threshold
- STATUS – blinks out currently selected page
Configurations
The ECT threshold values, used to trigger on and off the warning LEDs, can be
configured outside of the default values by using TeraTerm and an InterMotive
Download Cable (IDC). When the user types ‘cfg’ into TeraTerm configuration
menu (below) will display. From here the user can modify the threshold values
that will cause the warning LEDs to turn on. The user can also configure the
frequency at which the buzzer will chime.
Connection Diagram
Submit product registration at www.intermotive.net
If the TG752 fails any step in the Post Installation Check List, review the installation instructions and check all connections. If necessary, call Inter Motive Technical Support at 530-823-1048.
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