Harness Codes are used by the Main Display Module to determine the number of Gauge Cluster Modules that are present. Harness Codes also indicate whether optional sensors are installed and whether the engine is "JWAC" or "SCAC". Engine applications that are equipped with Prime Gauge Cluster Modules imply that the Standby Gauge Cluster Modules are also present. The Standby Quad Gauge Cluster includes gauge 1 through gauge 4. The Prime Quad Gauge Cluster includes gauge 1 through gauge 8. The Premium Quad Gauge Cluster includes gauge 1 through gauge 12. The following charts show the Harness Codes for Standby options, Prime options, and Premium options.
A panel is provided that gives the technician access to Terminal Block 2 (TB-2) to change the harness code. The harness code is changed by selecting which pins are open and which pins are grounded. Grounds can be left open while selecting the harness code. The grounds should not be left open on the harness code pins.
| Application | Mode 5 Harness Code Display | Connections On The 40 Pin Caterpillar Monitoring System Connector | |||||
| Pin 31 | Pin 03 | Pin 12 | Pin 22 | Pin 16 | Pin 6 | ||
| Generator Engine (1) with Standby Panel | 3 | Open | Open | Ground | Ground | Ground | Ground |
| Generator Engine (1) with Prime Panel | 5 | Open | Ground | Open | Ground | Ground | Ground |
| Generator Engine (1) with Premium Panel And SCAC | 6 | Ground | Open | Open | Ground | Ground | Ground |
| Generator Engine (1) with Premium Panel And JWAC | 7 | Open | Open | Open | Ground | Ground | Ground |
| Marine Propulsion Engine with Premium Panel And SCAC | 9 | Open | Ground | Ground | Open | Ground | Ground |
| Marine Propulsion Engine with Prime Panel And Marine Gear Sensors | 10 | Ground | Open | Ground | Open | Ground | Ground |
| Marine Propulsion Engine with Prime Panel And No Marine Gear Sensors | 11 | Open | Open | Ground | Open | Ground | Ground |
| Marine Propulsion Engine with Premium Panel And JWAC | 12 | Ground | Ground | Open | Open | Ground | Ground |
| Locomotive Engine | 35 | Open | Open | Ground | Ground | Ground | Open |
| ( 1 ) | Includes Marine Auxiliary |
Note: Reference Testing And Adjusting, "Connector Contact Description Of Main Display Module" for more information about the Connector Contacts for Generator Sets. Reference Testing And Adjusting, "Connector Contact Description Of Main Display Module" for more information about the Connector Contacts for Marine Engines. Reference Testing And Adjusting, "Connector Contact Description Of Main Display Module" for more information about Locomotive Engines.
Quad Gauge Module For Standby Generator Set Applications
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| Illustration 1 | g00530411 |
Engine Oil Pressure (1)
This module displays engine oil pressure over a range of 100 kPa (14.5 psi) to 600 kPa (87 psi).
When the needle is pointing straight up, the value for the gauge equals 400 kPa (58 psi).
The information is received from the engine ECM through the CAT Data Link.
Engine Coolant Temperature (2)
This engine coolant temperature gauge displays engine coolant temperature over a range of 60°C (140°F) to 120°C (248°F).
When the needle is pointing straight up, the value for the gauge equals 90°C (194°F). The information is received from the engine ECM through the CAT Data Link.
System Voltage (3)
This gauge displays battery voltage or charging system voltage over a range of 18 DCV to 32 DCV.
When the needle is pointing straight up, the value for the gauge equals 26 DCV.
The information is received from the engine ECM through the CAT Data Link.
Fuel Pressure (4)
This gauge displays fuel pressure over a range of 200 kPa (29 psi) to 600 kPa (87 psi).
When the needle is pointing straight up, the value for the gauge equals 500 kPa (72.5 psi) for all applications except the Locomotive engine.
When the needle is pointing straight up, the value for the gauge is 400 kPa (58 psi) for Locomotive applications .
Quad Gauge Module For Prime Generator Set Applications
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| Illustration 2 | g00530412 |
"RH/LH" Exhaust Temperature (1)
This module displays the exhaust temperature over a range of 400°C (752°F) to 750°C (1382°F).
When the needle is pointing straight up, the value for the gauge equals 600°C (1112°F).
The information is received from the engine ECM through the CAT Data Link.
"RH/LH" Air Inlet Restriction (2)
This module displays engine air inlet filter restriction over a range of 0 kPa (0 psi) to 10 kPa (1.45 psi).
When the needle is pointing straight up, the value for the gauge equals 3 kPa (.44 psi).
The information is received from the engine ECM through the CAT Data Link.
Fuel Filter Restriction (3)
This module displays fuel filter restriction over a range of 20 kPa (2.9 psi) to 140 kPa (20.3 psi).
The information is received from the engine ECM through the CAT Data Link.
Oil Filter Restriction (4)
This module displays oil filter restriction over a range of 20 kPa (2.9 psi) to 150 kPa (21.75 psi).
When the needle is pointing straight up, the value for the gauge equals 60 kPa (8.7 psi).
The information is received from the engine ECM through the CAT Data Link.
Quad Gauge Module For Premium Generator Set And Locomotive Applications
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| Illustration 3 | g00530415 |
Inlet Air Pressure (Boost) (1)
This module displays turbo compressor outlet pressure (boost) over a range of 0 kPa (0 psi) to 400 kPa (58 psi).
When the gauge is pointing straight up, the value for the gauge equals 190 kPa (27.6 psi).
The information is received from the engine ECM through the CAT Data Link.
Aftercooler Coolant Temperature (2)
This module displays aftercooler coolant temperature over a range of 20°C (68°F) to 120°C (248°F).
The information is received from the engine ECM through the CAT Data Link.
Inlet Air Temperature (3)
This module displays inlet air temperature over a range of 60°C (140°F) to 120°C (248°F).
When the gauge is pointing straight up, the value for the gauge equals 75°C (167°F).
The information is received from the engine ECM through the CAT Data Link.
Engine Oil Temperature (4)
This module displays engine oil temperature over a range of 60°C (140°F) to 120°C (248°F).
When the gauge is pointing straight up, the value for the gauge equals 105°C (221°F).
The information is received from the engine ECM through the CAT Data Link.
Quad Gauge Cluster Module For Premium Marine Applications
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| Illustration 4 | g00530416 |
Inlet Air Pressure (Boost) (1)
This module displays the turbo compressor outlet pressure (boost) over a range of 0 kPa (0 psi) to 400 kPa (58 psi).
When the gauge is pointing straight up, the value for the gauge equals 190 kPa (27.6 psi).
The information is received from the engine ECM through the CAT Data Link.
Aftercooler Coolant Temperature (2)
This module displays aftercooler coolant temperature over a range of 20°C (68°F) to 120°C (248°F). These temperatures are displayed for all Marine engines except the engines that have "JWAC" applications.
For JWAC applications, the module displays temperatures over a range of 60°C (140°F) to 120°C (248°F).
The information is received from the engine ECM through the CAT Data Link.
Marine Gear Transmission Oil Temperature (3)
This module displays marine gear transmission oil temperature over a range of 20°C (68°F) to 120°C (248°F).
When the gauge is pointing straight up, the value for the gauge equals 65°C (149°F).
The information is received from the Marine Gear Oil Temperature sensor.
Marine Gear Transmission Oil Pressure (4)
This module displays marine gear transmission oil pressure over a range of 150 kPa (21.8 psi) to 2875 kPa (417.9 psi).
The information is received from the Marine Gear Oil Pressure sensor.