345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Controller Input and Output Values Caterpillar


Controller Input and Output Values
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Table 1
Voltage Specifications For Connector 1    
No.     Item     Voltage In Normal Condition     Measurement Point    
1     +Battery     18 DCV to 32 DCV     GND    
2     GND     0 volts     GND    
3     Starter Switch     18 DCV to 32 DCV     GND    
11     +Battery     18 DCV to 32 DCV     GND    
12     GND     0 volts     GND    
13     Engine speed dial switch 1     Engine speed dial position
1, 2, 5, 6, 9, 10: approximately 0 volts
3, 4, 7, 8, 14 to 17 volts    
GND    
14     Engine speed dial switch 2     Engine speed dial position
2, 3, 4, 5, 10: approximately 0 volts
1, 6, 7, 8, 9: 14 to 17 volts    
GND    
15     Communications line (RS485+)     3.5 to 4.6 volts
3.0 to 4.3 volts    
GND
Conn 1 pin 16    
16     Communication line (RS485-)     0.1 to 1.2 volts     GND    
19     AVS Data Link (+)     3.5 to 4.6 volts     GND
   
3.0 to 4.3 volts CONN1, Pin 20    
20     AVS Data Link (-)     .1 to 1.2 volts     GND    
22     Fine swing switch (optional)     Machine with fine swing switch
OFF: approx. 0 volts
ON: 14 to 17 volts
Machine without fine swing switch: approx. 0 volts    
GND    
23     Engine speed dial switch 3     Engine speed dial position
4, 5, 6, 7, 8, 9, 10: approx. 0 volts
1, 2, 3: 14 to 17 volts    
GND    
24     Engine speed dial switch 4     Engine speed dial position
8, 9, 10: approx. 0 volts
1, 2, 3, 4, 5, 6, 7: 14 to 17 volts    
GND    
30     Electronic Governor Speed Command     1.5 (Low) to 10.5 (High) volts (10% to 92%)
Voltage proportional to engine RPM
Engine speed dial 1 = Low voltage
Engine speed dial 2 = Higher voltage    
GND    
31     RS232C TxD     Approx. -9.5 volts
(SIS component is not connected to conn 1 pin 06)    
GND    
32     RS232C RxD     Approx. 0 volts
(SIS component is not connected to conn 1 pin 06)    
GND    
33     RS232C GND     0 volts     GND    
34     Low idle switch     Low idle switch
When operated: approx. 0 volts
When not operated: 14 to 17 volts    
GND    
35     Hydraulic Tank Pressure Indicator     Approx. 0 volts - Indicator OFF and tank is pressurized.
18 to 32 volts - Indicator ON and tank is NOT pressurized    
GND    
36     Hydraulic Tank Pressure Switch     14 to 17 volts - Tank is pressurized
Approx. 0 volts - Tank is NOT pressurized    
GND    
37     Hammer switch     Pressure switch for hammer
ON: approx. 0 volts
OFF: 14 to 17 volts    
GND    
39     Hydraulic oil filter     Hydraulic oil filter
Normal: approx. 0 volts
Clogged: 14 to 17 volts    
GND    

Table 2
Voltage Specifications For Connector 2    
No.     Item     Voltage In Normal Condition     Measurement Point    
2     Pump delivery pressure sensor     0.7 to 9 volts
(Voltage changes in proportion to pump delivery pressure)
Standard
All control levers in NEUTRAL: 0.7 to 2.5 volts
When relieved: 7 to 9 volts    
GND    
3     Proportional reducing valve +     1.0 to 11 volts
Standard
All control levers in NEUTRAL: 6 to 9 volts
Lever is operated: voltage goes down    
GND    
4     Proportional reducing valve -     Approx. 0 volts     GND    
6     Attachment pressure switch     Attachment pedal operated: approx. 0 volts
Attachment pedal in NEUTRAL: 14 to 17 volts    
GND    
7     Implement pressure switch     Implement control levers or swing control lever operated: approx. 0 volts
Implement control levers or swing control lever in NEUTRAL: 14 to 17 volts    
GND    
8     Boom RAISE pressure switch     Boom control lever shifted to RAISE side 70 percent of stroke or more: approx. 0 volts
Other than above: 14 to 17 volts    
GND    
12     Trenching solenoid     Boom priority mode: approx. 0 volts
Swing priority mode: 18 to 32 volts    
GND    
15     Engine coolant level switch     Engine coolant level is above the specified level (ON): approx. 0 volts
Engine coolant level is below the specified level (OFF): 14 to 17 volts    
GND    
18     Travel pressure switch     Travel control lever operated: approx. 0 volts
Travel control lever in NEUTRAL: 14 to 17 volts    
GND    
21     Fine finish solenoid     Boom control lever shifted to RAISE side 70 percent of stroke or more: 18 to 32 volts
Other than above: approx. 0 volts    
GND    
22     Automatic travel speed change solenoid     Travel mode = RABBIT
Travel control lever = operate, and pump delivery pressure service code 91 setting value: 18 to 32 volts
Travel mode + tortoise or travel control lever = NEUTRAL: approx. 0 volts    
GND    
24     Engine speed sensor +     When engine is at high idle:
approx. 16 volts (measured by AC range ACV)    
Conn 2 Pin 25    
25     Engine speed sensor -     Approx. 0 volts     GND    
26     Engine oil pressure switch     Engine running (ON): approx. 0 volts
Engine OFF: 14 to 17 volts    
GND    
27     Swing brake solenoid     Machine without fine swing switch
Implement control levers or swing control levers are operated: 18 to 32 volts
Implement control levers or swing control levers are in NEUTRAL: approx. 0 volts (In 6.5 seconds after control levers are returned to NEUTRAL: 18 to 32 volts)
Machine with fine swing switch
Fine swing switch OFF: Same as machine without the switch
Fine swing switch ON: 18 to 32 volts    
GND    
29     Fuel level     Fuel: FULL
Sensor resistance : approx. 8.0 ohms
Voltage: approx. 0.2 volts
Fuel: HALF
Sensor resistance: approx. 33.8 ohms
Voltage: approx. 1.0 volts
Fuel: EMPTY
Sensor resistance: approx. 83.5 ohms
Voltage: approx. 2.2 volts    
GND    
30     Hydraulic Oil Temperature    
0 °C (32 °F)
Sensor resistance: approx. 23.13 ohms
Voltage: approx. 9.7 volts

25 °C (77 °F)
Sensor resistance: approx. 6.82 ohms
Voltage: approx. 7.1 volts

50 °C (122 °F)
Sensor resistance: 2.47 ohms
Voltage: approx. 4.2 volts

75 °C (167 °F)
Sensor resistance: approx. 1.08 ohms
Voltage: approx. 2.3 volts    
GND    
31     Travel Alarm     Travel control lever is operated: 18 to 32 volts
Travel control is in NEUTRAL: approx. 0 volts    
GND    
34     Alternator R terminal     Engine runs at high idle: approx. 14 volts     GND    
35     Clogged air filter switch     Air filter is normal (OFF): 14 to 17 volts
Air filter is clogged (ON): approx. 0 volts    
GND    
36     Engine oil level switch     Engine oil level is above the specified level (ON): approx. 0 volts
Engine oil level is below the specified level (OFF): 14 to 17 volts    
GND    
38     +Battery Output     18 to 32 volts     GND    
40     Hydraulic Oil Level Switch     Hydraulic oil level is above the specified level (ON): approx. 0 volts
Hydraulic oil level is below the specified level (OFF): 14 to 17 volts    
GND    

Information System:

345B, 345B Series II and W345B Series II Excavators Engine and Pump Control Speed Sensor - Replace
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