2001/01/01 Caterpillar


New Engine Pressure Sensors are Available {1917, 1923, 1925}

Usage:

3126B 1AJ
Truck Engines:
3126B (S/N: 1AJ1-UP; 7AS1-UP; 8SZ1-UP; 8YL1-UP; BKD1-UP)
3406E (S/N: 1MM1-UP; 2WS1-UP)
C-10 (S/N: 3CS1-UP)
C-12 (S/N: 2KS1-UP)
C-15 (S/N: 6NZ1-UP)
C-16 (S/N: 7CZ1-UP)

Description of Change: The new pressure sensors have improved connector contacts in order to provide improved durability and more reliable transmission of the signal.

Adaptable To: The new pressure sensors are direct replacements for the former sensors. Refer to Table 1. The new sensors are adaptable to first production of the engine models that are listed above. The pins in the mating connector on the engine wiring harness should be replaced with three 9X-3401 Connector Pins .

If an engine that is equipped with the former pressure sensors logs a diagnostic code that relates to a pressure sensor, but the diagnostic code is not active, do not replace the sensor. Rather, the former sensors should be updated by replacing the connector sockets with three 9X-3402 Connector Sockets. The pins in the mating connector on the engine wiring harness should be replaced with three 9X-3401 Connector Pins.

Table 1
3126B    
New Part Number     Description     Former Part Number    
194-6722     Pressure Sensor (Atmospheric)     161-9925 (1)    
194-6723     Pressure Sensor (Boost)     161-9928 (1)    
194-6726     Pressure Sensor (Injection Actuation)     167-1708 (1)    
( 1 ) Early 3126B Engines (S/N: 7AS; 8SZ) used sensors which preceded these part numbers.

Table 2
C-10, C-12, C-15, C-16, and 3406E    
New Part Number     Description     Former Part Number    
194-6722     Pressure Sensor (Atmospheric)     161-9925    
194-6724     Pressure Sensor (Boost)     161-9929    
194-6725     Pressure Sensor (Engine Oil)     161-9931    

Caterpillar Information System:

C-10, C-12, C-15 and C-16 Industrial Engines E017 High Engine Coolant Temperature Warning
C-10, C-12, C-15 and C-16 Industrial Engines Event Codes
3126B Industrial Engines CID 0274 FMI 04 Atmospheric Pressure short to ground
3126B Industrial Engines CID 0274 FMI 03 Atmospheric Pressure open/short to +batt
3126B Industrial Engines CID 0273 FMI 04 Turbo Outlet Pressure short to ground
3126B Industrial Engines CID 0273 FMI 03 Turbo Outlet Pressure open/short to +batt
3126B Industrial Engines CID 0262 FMI 04 5 Volt Sensor DC Power Supply short to ground
3126B Industrial Engines CID 0262 FMI 03 5 Volt Sensor DC Power Supply short to +batt
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