CYLINDER BLOCK GP 2P6560 - Caterpillar

Illustration 8 g00889801
Harness connectors for the various sensors (A) 5 volt supply (B) Return (C) Signal (1) Signal (2) Return
At the harness connector for the suspect sensor, measure the voltage between terminals "B" and "C", or between terminals "1" and "2".Expected Result:The voltage is between 6.0 VDC and 7.0 VDC.Results:
OK - The voltage between the signal terminal and the return terminal is between 6.0 VDC and 7.0 VDC. The pull-up voltage that is created by the master ECM is present at the sensor connector. The signal wire and the return wire for the suspect sensor appear to be OK. Proceed to Test Step 8.
Not OK - The voltage between the signal terminal and the return terminal is not between 6.0 VDC and 7.0 VDC. The pull-up voltage that is created by the master ECM is not present at the sensor connector. Proceed to Test Step 7.Test Step 7. Check the Pull-Up Voltage at the Master ECM
Set the engine control to the OFF/RESET mode. Switch the 16 amp circuit breaker OFF.
Illustration 9 g00901960
Harness side of the master ECM P1 connector (P1-3) Analog return (P1-14) Inlet air temperature (P1-17) Oil temperature (P1-24) Filtered oil pressure (P1-26) Unfiltered oil pressure (P1-27) Engine coolant temperature
Use a 151-6320 Wire Removal Tool to remove the signal wire for the suspect sensor from the P1 connector.
Use a jumper wire with Deutsch terminals on the ends. Insert one end of the jumper wire into the open terminal of the P1 connector.
Connect a multimeter lead to the end of the jumper wire that is not inserted into the connector.
At the harness side of the P1 connector, insert a 7X-1710 Multimeter Probe along terminal 3.
Connect the other multimeter lead to the probe.
Switch the 16 amp circuit