3176B INDUSTRIAL ENGINE ELECTRONIC MONITORING SYSTEM INCLUDES COMPUTERIZE Caterpillar

Connecting Cruise Control/PTO, Set/Resume, Clutch, Shutdown And Service Brake Switches

The Caterpillar electronic Engine cruise control operates similar to automotive cruise controls. The PTO operates similar to cruise, only it governs engine speed with the vehicle stationary, or at low vehicle speeds. Momentarily toggling the switch decelerates (Resume/Decel or accelerates (Resume/Accel) the set point at one mph (one km/h) or 20 RPM in PTO mode. The following switch inputs affect cruise or PTO.

NOTE: Set and Resume switches are Customer Programmable for Set/Accel - Resume/Decel or Set/Decel - Resume/Accel.

* Cruise Control/PTO On/Off - This switch must be ON for cruise or PTO to be activated.

* Set/Accel or Set/Decel-With the Cruise/PTO On/Off switch ON, momentarily pressing this switch will activate Cruise Control/PTO, and the ECM will maintain the current speed. Holding this switch ON causes cruise or PTO to accelerate (Set/Accel) or decelerate (Set/Decel) this set point. Momentarily toggling the switch accelerates (Set/Accel) or decelerates (Set/Decel) the set point at one mph (one km/h) or 20 RPM in PTO mode.

* Resume/Decel or Resume/Accel-With the Cruise Control/PTO On/Off switch ON, momentarily pressing this switch will activate cruise or PTO, and the ECM will resume cruise or PTO to the set point used when Cruise or PTO was last disabled. Holding this switch ON causes cruise or PTO to slowly decelerate (Resume/Decel) or accelerate (Resume/Accel) this set point. Momentarily toggling the switch decelerates (Resume/Decel) or accelerates (Resume/Accel) the set point at one mph (one km/h) or 20 RPM in PTO mode.

* Clutch-Depressing the clutch pedal will cause the Cruise or PTO to deactivate.

* Brake-Depressing the brake pedal will cause the Cruise or PTO to deactivate.

* Shutdown Switch-Grounding this switch will cause the engine to shutdown.

Cruise Control/PTO And Set/Resume Diagram

NOTE: All of these switches are supplied by the vehicle OEM. If the problem is with undetermined Cruise/PTO "kickouts", install an ECAP and check the ECAP status screen indicating the last cause of the Cruise/PTO "kickout" since ECM power-up. (Refer to the Electronic Troubleshooting Manual.)

It is important to note the parameter indicates the last kickout only since the ECM was powered. When the ECM is powered-up, it remains blank until the ECM has kicked out of Cruise/PTO. Refer to the following tables to interpret the ECAP "kickout" status parameter. The voltage at each of the switch inputs to the ECM should be 11.0 to 12.0 volts DC with the switch OFF, and less than 0.5 volt DC with the switch ON.

Cruise Control/PTO, Set/Resume, Clutch, Shutdown and Service Brake Switch Schematic

NOTE: The Clutch Switch and Service Brake Switch must be open circuits when the particular pedal is depressed.

Coolant Level Sensor

Engine Monitoring (with the Coolant Level Sensor enabled) requires an OEM provided/installed coolant level sensor. The sensor operates as a low coolant level sensor. The sensor outputs, Coolant Level Low and Coolant Level Normal, are complementary and will change status with the presence or absence of fluid at the sensing tip. Currently, the only sensor recognized to meet the Caterpillar requirement for this feature is the Robertshaw Controls Co. RS-805B (Robertshaw part number 85927-C1). Compatibility with 3176B Electronic Control system requires that the coolant level sensor meet the following electrical specifications.

Coolant Level Sensor Electrical Specifications

The information in Coolant Level Sensor Power Supply, Coolant Level Sensor Outputs, Coolant Level Sensor Response Time and Coolant Level Sensor Environmental Compatibility is available on Caterpillar requirement print 3E7513.

Coolant Level Sensor Connections

Coolant Level Sensor

Coolant Level Sensor Power Supply-The sensor must operate off the ECM regulated power supply of 5.0 ± 0.25 VDC. Total current draw by the sensor at the +5V pin must not exceed 20mA under any conditions.

Coolant Level Sensor Outputs-All voltages are DC and referenced to Sensor Common at the ECM Connector J1/P1.

NOTE: The vehicle harness for the Coolant Level Sensor should not be connected to the ECM when a sensor is not installed.

* Coolant Level Low

Fluid Present - Output voltage equals 0.5 volts maximum when sinking 10 mA or less.

Fluid Absent - Output voltage equals 4.1 volts minimum when sourcing 1 mA or less. (The outputs must be able to tolerate a 20,000 Ohms or greater resistance pulled up to 13 volts.)

* Coolant Level Normal

Fluid Present - Output voltage equals 4.1 volts minimum when sourcing 1 mA or less. (The outputs must be able to tolerate a 20,000 Ohms or greater resistance pulled up to 13 volts.)

Fluid Absent - Output voltage equals 0.5 volts maximum when sinking 10 mA or less.

Coolant Level Sensor Response Time

Sensor outputs must change status in less than two seconds when subjected to an immersion-removal transition. Coolant Level Low must change status within ±1.0 millisecond of a Coolant Level Normal state change.

Coolant Level Sensor Diagnostic

If the ECM Coolant Level Circuit indicates the sensor outputs are at the same voltage for at least two seconds, a diagnostic code is triggered.

Coolant Level Sensor Environmental Compatibility

The OEM should determine worst case mechanical, electrical, and electromagnetic field environments for the coolant level sensor and verify the selected coolant level sensor will function properly and reliably under worst case conditions.

NOTE: If engine monitoring is programmed OFF or Coolant Level Sensing is Disabled through the Customer Programmable option, it is not necessary to jumper any connector pins on the OEM connector. The ECM will ignore the coolant level inputs.

Mounting Guidelines

To ensure proper operation of the Robertshaw RS-805B coolant level sensor, the following mounting guidelines should be followed.

* The sensor is supplied with thread sealant applied to the threads. No other tape or sealant should be applied when mounting.

* For the liquid present signal, the sensor must be mounted in a position completely immersing the sensing tube.

* For the liquid absent signal, the sensor must be mounted in a position with no fluid contacting the entire sensing tube.

* The output signal is indeterminate when only a portion of the sensing tube is immersed in fluid.

* The sensor should be mounted low enough in the tank to operate correctly under all slosh, tilt, and roll conditions.

Connecting The Auxiliary Oil Temperature Sensor

100-3055 Auxiliary Oil Temperature Sensor Schematic

1. Install 100-3055 Auxiliary Oil Temperature Sensor.

2. Connect from J108 Pin-1 to P108A Pin-A of the auxiliary oil temperature sensor.

3. Connect from J108 Pin-2 to P108A Pin-B of the auxiliary oil temperature sensor.

4. Connect from J108 Pin-3 to P108A Pin-C of the auxiliary oil temperature sensor.

NOTE: Refer to Customer Specified Parameters, in this instruction, for selecting the high oil temperature set point.

Connecting The Auxiliary Oil Pressure Sensor

1. Install 134-0420 Auxiliary Oil Pressure Sensor.

2. Connect from J109 Pin-1 to P109A Pin-A of the auxiliary oil temperature sensor.

3. Connect from J109 Pin-2 to P109A Pin-B of the auxiliary oil temperature sensor.

4. Connect from J109 Pin-3 to P109A Pin-C of the auxiliary oil temperature sensor.

NOTE: Refer to Customer Specified Parameters, in this instruction, for selecting the high oil temperature set point.

NOTE: For the 7E3156 or 7C1072 Tachometer, the tachometer engine speed calibration is 113 ppr. The ECM must be programmed to this value. If another manufacturer's tachometer is used, it must meet SAE J1809 signal requirements and the ECM must be programmed to the tachometer signal value.

Installing ECAP Connector

The Electronic Control Analyzer Programmer (ECAP) is powered by 12 volts DC to 24 volts DC through the J4 ATA (J1587) Connector. Use the following procedures to connect the ECAP to the engine.

1. Connect (+)Battery Bus Bar to Pin-A of the 9W1951 Flange Receptacle. Install a 5 Amp fuse in the circuit to protect the ECAP.

2. Connect (-)Battery Bus Bar to Pin-B of the 9W1951 Flange Receptacle.

NOTE: The ATA data link wires should be a twisted pair of 16 AWG wire, with approximately three twists per 25.4 mm (1.00 in). The length should NOT exceed 40 m (130 ft).

3. Connect from Pin-7 of the J1 Customer Connector to Pin-J of the 9W1951 ATA data link flange receptacle.

4. Connect from Pin-1 of the J1 Customer Connector to Pin-H of the 9W1951 ATA data link flange receptacle.

5. If shielded wire is used, ONE end of shield MUST be connected to (-)Battery Bus Bar.

6. The ECAP may be connected to the ECM at J4 ATA Data Link connector. Only one side of the Breakout T harness connector cable is used.

NOTE: Remove the 8C6354 Cap on J4 connector and replace after testing has been completed.

7. Connect the opposite end of the Breakout T harness to the ECAP.

NOTE: The ECAP will operate with the engine running, or with the engine OFF, ignition key ON.