5032949 JOHNSON NUT

Illustration 1 g01078407
Schematic for the analog sensorsTest Step 1. Inspect the Electrical Connectors and Wiring
Illustration 2 g01071294
Terminal box (1) ECM connectors J1/P1 (2) J12/P12 connectors for the analog sensors (3) 16 amp circuit breaker
Set the engine control to the OFF/RESET mode. Switch 16 amp circuit breaker (3) to the OFF position.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect the following connectors:
J1/P1 connectors
J12/P12 connectors on the terminal box
Check the torque of the allen head screw for the ECM connector. The proper torque is 6 1 N m (55 9 lb in).
Illustration 3 g01071300
Harness side of the P1 connector (P1-2) 5 volt supply (P1-3) Return (P1-14) Signal for the inlet manifold air temperature (P1-17) Signal for the engine oil temperature (P1-24) Signal for the filtered engine oil pressure (P1-26) Signal for the unfiltered engine oil pressure (P1-27) Signal for the engine coolant temperature
Illustration 4 g00889763
Harness side of the P12 connector (P12-A) 5 volt supply (P12-C) Return (P12-E) Signal for the unfiltered engine oil pressure (P12-F) Signal for the filtered engine oil pressure (P12-H) Signal for the engine oil temperature (P12-J) Signal for the engine coolant temperature (P12-K) Signal for the inlet manifold air temperature
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the analog sensors.
Illustration 5 g01071307
Right side view (4) Inlet air temperature sensor (5) Engine coolant temperature sensor
Illustration 6 g01071314
Left side view (6) Unfiltered oil pressure sensor (7) Filtered oil pressure sensor (8) Oil temperature sensor
Check the harness and wiring for abrasion and pinch points from the analog sensors to the ECM.Expected Result:All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points. The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - At least one of the connectors, pins, and/or sockets are not connected properly. At least one of the connectors and/or the wiring have corrosion, abrasion, and/or pinch points.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Check for Diagnostic Codes for the Power Supply
Connect Cat ET to the service tool connector on the terminal box.
Switch the 16 amp circuit breaker ON. Set the engine control to the STOP mode.
Observe the "Active Diagnostic" screen on Cat ET. Allow a minimum of 30 seconds for any codes to activate. Look for these codes:
262-03 5 Volt Sensor DC Power Supply short to +batt
262-04 5 Volt Sensor DC Power Supply short to groundExpected Result:There are no active "5 Volt Sensor DC Power Supply" diagnostic codes.Results:
No codes - There are no active "5 Volt Sensor DC Power Supply" diagnostic codes. Proceed to Test Step 3.
Active code - There is an active "5 Volt Sensor DC Power Supply" diagnostic code. This procedure will not work when this type of code is active.Repair: Refer to Troubleshooting, "+5V Sensor Supply".If necessary, return to this functional test in order to troubleshoot the analog sensor after the "+5 V Sensor Supply" diagnostic code has been resolved.STOPTest Step 3. Check for Active Analog Sensor Diagnostic Codes
Observe the "Active Diagnostic" screen on Cat ET. Wait at least 30 seconds so that any codes may become activated. Look for the codes that are listed in Table 1:
Table 1
Analog Sensor Diagnostic Codes    
100-03     Engine Oil Pressure open/short to +batt    
100-04     Engine Oil Pressure short to ground    
110-03     Engine Coolant Temperature open/short to +batt    
110-04     Engine Coolant Temperature short to ground    
172-03     Intake Manifold Air Temp open/short to +batt