3176B MARINE ENGINE ELECTRONIC CONTROL SYSTEM INCLUDES COMPUTERIZE Caterpillar

EMS Display and Functions.

EMS is an electronic monitoring system designed to display various engine/transmission parameters. The display technology provides excellent visibility at various light conditions, and also supports various back light options.

EMS incorporates three individual gauge units which can be located in variable installation conditions to enhance pilot and vessel operation from primary and remote positions. One main EMS gauge unit is required for each engine at each desired pilot station. The tachometer and/or quad-gauge unit is optional, however, these two units will NOT operate without connection to a main EMS unit. The following information describes the functions of each gauge unit.

* The main EMS gauge unit has ten (two rows of five) indicators to display system related diagnostics. A digital LCD is functional to scroll through the different engine/transmission parameters monitored.

The monitored parameters include the following functions.

Engine Overspeed (Main and Back-up Speed Sensors)

Engine Oil Pressure

Engine Coolant Temperature and Coolant Level

Transmission Oil Pressure and Oil Temperature

Engine Hours

Fuel Rate (Throttle) and

Percent Load (Actuator).

EMS gauge units wiring diagram using 121-4017 Harness.

* The quad-gauge unit displays in analog format engine oil pressure, engine coolant temperature, transmission oil pressure and transmission oil temperature.

* The tachometer unit displays engine speed (rpm) on an analog gauge. A three-digit LCD indicator displays vessel speed and a two-digit indicator displays trolling mode status or synchronization mode status.

The electronic control system (ECM) processes engine/transmission parameters and diagnostic information. The parameters will then be transmitted to EMS through the data link. The main EMS unit receives and displays the information on various gauges. Only two wires are required from the ECM to EMS to transmit/receive all engine/transmission parameters.

Communication Data Link

EMS provides two output pins that are dedicated to the CAT data link (Pin-5 and Pin-6). The link is available to share data with other modules on the link (which essentially allows the EMS, CMS and ECM to communicate when connected together).

CAT Data Link

1. Connect Pin-3 (CAT data link -) of the P1 (40-Pin ECM Customer Connector) to Pin-5 (Data -) of the J1 (12-Pin Customer Connector).

2. Connect Pin-9 (CAT data link +) of the P1 (40-Pin ECM Customer Connector to Pin-6 (Data +) of the J1 (12-Pin Customer Connector).

NOTE: For the connections in Step 1 and Step 2, use twisted pair of shielded 16 AWG wires, approximately three twists per 25.4 mm (1.00 in) to connect CAT data link (+) and CAT data link (-). The length of the wires should NOT exceed 40 m (130 ft).

EMS Gauge Unit Dimensions

EMS Gauge Dimensions and Mounting Requirements.

NOTE: Each EMS module (gauge unit) has identical dimensions. The mounting options with bezels are described below.

Each module can be mounted from either the front or rear, and with or without a decorative bezel. Each module has a 5 mm (0.2 in) tapped hole in each corner (four holes), a 4 mm (0.16 in) clearance hole in each corner, and four 6 mm (0.24 in) tapped holes in the back of the housing.

* Front Mount

The brackets are NOT used.

The bezel must be installed over the front of the module. The 4 mm (0.16 in) screws (or smaller) mount through the bezel (four corners) and into the gauge module tapped holes and screwed into the dash panel mounting surface.

* Rear Mount

The bracket is required and may be "U"-shaped to butt against the dash panel and pull the module tightly against the dash panel. (The bracket shown is a reference. The length of the bracket legs must be adjusted to fit your dash panel.) The bracket can be attached to the module with the 8T3992 screws (6 mm [0.24 in]) in the holes on the rear of the module.

The bezel can then be attached to the gauge module with 7Y7388 screws (5 mm [0.2 in]) through the bezel into the tapped holes in the module flange. (Note: Screws must not exceed 12 mm (0.47 in) long or they will protrude through the module into the dash panel.)

Connecting the EMS Display

121-4017 Harness

1. Connect P1 (40-Pin) gauge connector to 117-6596 EMS Gauge main unit.

Connecting Tachometer and Quad-Gauge Units

2. Connect P2 (6-Pin) tachometer gauge connector to 117-9016 EMS Tachometer Gauge unit.

3. Connect P3 (6-Pin) quad-gauge connector to 117-9015 EMS Quad-Gauge unit.

Connecting Gauge Back Lighting

4. Insert lamps into P4 and P5 (Tachometer Back Lights).

5. Insert lamps into P6 and P7 (Quad-Gauge Back Lights).

6. Connect P4 and P5 (Tachometer Back Light) to the Tachometer gauge.

7. Connect P6 and P7 (Quad-Gauge Back Light) to the Quad-Gauge.

Connecting Battery to EMS

8. Connect (+)Battery Bus Bar to the positive terminal of the Start (Ignition) Switch. Connect the RUN terminal of the Start (Ignition) Switch to Pin-1 of J1 (12-Pin Customer Connector).

NOTE: The preferred method is to connect both PORT and STBD EMS displays through the same ignition switch.

9. Connect (-)Battery Bus Bar to Pin-2 of the J1 (12-Pin Customer Connector).

Connecting Inputs to EMS

Switches and input connections to J1 (12-Pin) Customer Connector.

Display Scroll Switch

1. Connect Pin-4 of the J1 (12-Pin Customer Connector) to N/O terminal on a momentary (Display Scroll) switch. Connect the common terminal of the momentary switch to (-)Battery Bus Bar. This will enable the user to scroll through different engine/transmission parameters on the main EMS unit each time the switch is closed. Refer to following NOTE.

U.S./Metric Display Switch (If Required)

Default setting for the EMS is Metric (SI) units. If Metric (SI) units only are required, no switch connection is needed. U.S. (non-SI) units are enabled when switched to (-)Battery. A required, permanent connection to (-)Battery is needed.

2. Connect (-)Battery Bus Bar to the common terminal of a (U.S./Metric) switch. Connect open terminal to Pin-3 of the J1 (12-Pin Customer Connector). This will enable the user to select display units (U.S./Metric). The EMS will display metric units when the switch is connected to (-)Battery Bus Bar and U.S. units when the switch is open.

NOTE: Two of each (U.S./Metric and Scroll) switch MUST be installed. The required method is to connect separate U.S./Metric switches and Scroll switches for the PORT EMS display and the STBD EMS display.

Transmission Function Disable (Display/Diagnostic)

3. Connect (-)Battery Bus Bar to Pin-7 of the J1 (12-Pin Customer Connector).

NOTE: When pin-7 is connected to (-)Battery Bus Bar, this connection disables the transmission temperature AND pressure display. This option can be used in installations that do not require a transmission.

Connecting Back Light Dimming Potentiometer

Schematic for Gauge Back Light Potentiometer.

1. Connect from Pin-10 (Dimmer Potentiometer) of the J1 (12-Pin Customer Connector) to the wiper of the dimmer potentiometer.

2. Connect one terminal of the dimmer potentiometer to the (+)Battery Bus Bar.

3. Connect the other terminal to the (-)Battery Bus Bar.

NOTE: Two dimmer potentiometers MUST be installed, one for the PORT EMS and one for the STBD EMS. The required method is to connect separate dimming potentiometers for each EMS display.

Connecting Optional Diagnostic Outputs

The wiring harness provides diagnostic outputs, which can be used to drive a relay, audible or visual alarm.

The EMS horn output warns the user of any engine diagnostic and/or engine warning condition present. An additional switch can be installed to enable or disable the horn.

Schematic for Diagnostic Lamp and Alarm.

Diagnostic Lamp

1. Connect from Pin-8 (Warning Lamp) of the J1 (12-Pin Customer Connector) to the positive terminal of the lamp.

2. Connect the (-)Battery terminal to the (-)Battery Bus Bar.

Diagnostic Alarm

NOTE: The Horn driver is a 300 mAmp sourcing type driver.

3. Connect from Pin-9 (Warning Alarm) of the J1 (12-Pin Customer Connector) to the positive terminal of the alarm.

4. Connect the (-)Battery terminal to the (-)Battery Bus Bar.

Connecting the Optional EMS Horn Enable/Disable Switch

5. Connect from (-)Battery terminal (Pin-2) of the horn to Pin-1 of the Enable/Disable Horn switch.

6. Connect Pin-2 of the Enable/Disable Horn switch to (-)Battery Bus Bar.

Connecting Optional Remote Units

Tachometer or Quad-Gauge

NOTE: The wires should be 16 AWG wire with the length NOT exceeding 6 m (20 ft).

Remote Gauge Connection Schematic.

1. Connect Pin-5 (Mod Load) of the J2 (8-Pin EMS Customer Connector) to Pin-5 (Mod Load) of the (6-Pin) Remote Gauge Connector.

2. Connect Pin-3 (Mod Clock) of the J2 (8-Pin EMS Customer Connector) to Pin-3 (Mod Clock) of the (6-Pin) Remote Gauge Connector.

3. Connect Pin-1 (+V Mod) of the J2 (8-Pin EMS Customer Connector) to Pin-1 (+V Mod) of the (6-Pin) Remote Gauge Connector.

4. Connect Pin-4 (Mod Data) of the J2 (8-Pin EMS Customer Connector) to Pin-4 (Mod Data) of the (6-Pin Remote Gauge Connector.

5. Connect Pin-2 (-Battery) of the J2 (8-Pin EMS Customer Connector) to Pin-2 (-Battery) of the (6-Pin) Remote Gauge Connector.

Connecting Remote Gauge Back Light

6. Connect Pin-8 (+Battery Illumination) of J2 (8-Pin Remote Gauge Connector) to the (+)Battery terminal of the dimmer potentiometer.

7. Connect Pin-7 (-Battery Illumination) of J2 (8-Pin Remote Gauge Connector) to the (-)Battery terminal of the dimmer potentiometer.

8. Connect from the wiper terminal of the dimmer potentiometer to Pin-2 of one Remote Gauge Back Light.

9. Connect Pin-7 (-Battery Illumination) of J2 (8-Pin Remote Gauge Connector) to Pin-1 of the other Remote Gauge Back Light.

10. Connect Pin-1 of the first Remote Gauge Back Light to Pin-2 of the other Remote Gauge Back Light.

Connecting Multiple EMS Displays

Multiple EMS Display wiring connections.

Additional EMS displays (up to five per engine) can be installed to allow for multiple station installation. The EMS for each station can be connected as shown in the illustration above. For additional stations, make multiple connections to the CAT data link (+) and CAT data link (-). The preferred method is through a terminal strip.

NOTE: The length of the wires should NOT exceed 40 m (130 ft). Twisted shielded 16 AWG wire should be used, approximately three twists per 25.4 mm (1.00 in), to connect CAT data link (+) and CAT data link (-).

Connecting Multiple CMS/EMS Displays

Multiple EMS/CMS Display wiring connections.

Additional CMS and EMS displays (up to five per engine) can be installed to allow for multiple station installation. The CMS or EMS for each station can be connected as shown in the illustration above. For additional stations, make multiple connections to the CAT data link (+) and CAT data link (-). The preferred method is through a terminal strip.

NOTE: The length of the wires should NOT exceed 40 m (130 ft). Twisted shielded 16 AWG wire should be used, approximately three twists per 25.4 mm (1.00 in), to connect CAT data link (+) and CAT data link (-).