Series 60 – Section 6.9 Throttle Actuator for the Series 60G Engine

Section 6.9
Throttle Actuator for the Series 60G Engine

The throttle actuator is used to control the amount of air and fuel mixture to the engine. A butterfly valve within the body is positioned by an electric actuator that is controlled by DDEC III/IV. See Figure "Throttle Actuator for the Series 60G Engine" .‪

Figure 1. Throttle Actuator for the Series 60G Engine

Listed in Table "Throttle Control Diagnostic Codes for the Series 60G Engine" are the throttle control diagnostic codes:‪

Description ‪	Condition ‪	PID ‪	FMI ‪	Information ‪
Throttle Plate Position‪	HIGH Voltage‪	P51‪	3‪	Indicates that the Throttle Plate Position Sensor input to the ECM has exceeded 95% (normally >4.75 volts) of the sensor supply voltage. This diagnostic is typically an open sensor return circuit or sensor signal circuit is shorted to the sensor +5 volt supply.‪
Throttle Plate Position‪	LOW Voltage‪	P51‪	4‪	Indicates that the Throttle Plate Position Sensor input to the ECM has dropped below 5% (normally < 0.25 volts) of the sensor supply voltage. This diagnostic condition is typically detected when there is:- An open sensor signal circuit- An open sensor +5 volt supply circuit- The sensor signal is shorted to the sensor return circuit or to ground.‪
Throttle Plate Position‪	HIGH Position‪	P51‪	0‪	Indicates that the Throttle Plate Position Sensor input to the ECM has indicated that the throttle plate has exceeded the recommended operating range.‪
Throttle Plate Position‪	LOW Position‪	P51‪	1‪	Indicates that the Throttle Plate Position Sensor input to the ECM has indicated that the throttle plate has dropped below the recommended operating range.‪

Section 6.9.1
Reuse or Replacement of Throttle Actuator for the Series 60G Engine

The throttle actuator is non-serviceable and should be replaced as a unit. No adjustment is required. ‪

Section 6.9.2
Removal of Throttle Actuator for the Series 60G Engine

Remove the throttle actuator as follows:‪

1. Vent fuel system; refer to "2.51.1 Venting an Operable Engine to Relieve Natural Gas Pressure" and refer to "2.51.2 Venting an Inoperable Engine to Relieve Natural Gas Pressure" .
2. Disconnect and remove the six-wire power harness connectors from the throttle actuator.
3. Remove the four bolts connecting the throttle actuator to the mounting bracket.
4. Remove 8 bolts and nuts attaching the throttle to the inlet and outlet tube assemblies.

Section 6.9.3
Disassembly of Throttle Actuator for the Series 60G Engine

Disassembly of the throttle actuator is not required.‪

Section 6.9.4
Cleaning of Throttle Actuator for the Series 60G Engine

Cleaning of the throttle actuator is not required.‪

Section 6.9.4.1
Inspection of Throttle Actuator for the Series 60G Engine

Inspection of the throttle actuator is not required.‪

Section 6.9.4.2
Test of Throttle Actuator for the Series 60G Engine

Test of the throttle actuator is not required.‪

Section 6.9.5
Installation of Throttle Actuator for the Series 60G Engine

Install the throttle actuator as follows: ‪

1. Secure the throttle actuator to the mounting bracket with the four bolts and washers and torque to 20 N·m (15 lb·ft).
2. Connect the six-wire power harness.
3. Install a new gasket and attach the outlet tube assembly using four bolts.
4. Install a new gasket and attach the inlet tube assembly using four bolts.

   EXPLOSION ‪

   To avoid injury from an explosion of natural gas, the following precautions must be taken:‪ Do not smoke when installing or servicing the engine or fuel system. Installation or servicing of natural gas equipment must only be conducted in well ventilated, natural gas-compatible areas. Do not install or service equipment in an enclosed area where ignition sources are present without first ensuring that an undetected gas leak may be safely vented without being ignited. Bleed natural gas lines before installing or servicing any component connected to the fuel lines. Natural gas fuel systems are pressurized. Relieve pressure from any fuel system component prior to installation or service of that component. Use a combustible-gas detector. Liquefied natural gas (LNG) is odorless and cannot be detected by smell. Compressed Natural gas (CNG) may be odorless and may not be detected by smell. Equipment fuel systems are the responsibility of the Original Equipment Manufacturer (OEM). Equipment fuel system guidelines must be closely adhered to when installing or servicing equipment. Refer to OEM guidelines specifying which maintenance procedures require venting of fuel lines and fuel tanks. LNG systems are pressurized and contain extremely cold (-162° C [-260° F]) fluids. Contact the fuel supplier or OEM for LNG safety requirements. Contact with LNG may cause personal injury (freezing). Vent systems on the equipment should be ducted to a safe area whenever equipment is in an enclosed area.

5. Run engine and check for air or air and fuel mixture leaks at the throttle and connecting hoses. Refer to "2.51.3 Leak Checking the Natural Gas Fuel System" .