0172716 JOHNSON ARMATURE ASSY

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C-10 and C-12 Pressure sensors
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3406E Pressure sensors
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C-15, C-16 and C-18 Pressure sensors
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Schematic for engine pressure sensors
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Terminal locations for ECM
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Sensor connectorTest Step 1. Check for Active +5 V Sensor Supply Diagnostic Codes
Connect the Caterpillar Electronic Technician (Cat ET) to the data link connector.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Verify if any of the following diagnostic codes are active:
232-03 5 Volt Supply voltage high
232-04 5 Volt Supply voltage lowExpected Result:None of the preceding diagnostic codes are active.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Perform the following diagnostic procedure: Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test".STOPTest Step 2. Inspect Electrical Connectors And Wiring
Thoroughly inspect the J2/P2 ECM connector and the connectors for any suspect sensors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the active diagnostic code.Refer to Illustration 5.
Check the ECM connector (Allen Head Screw) for the proper torque of 6.0 N m (55 lb in).
Check the harness and wiring for abrasion and pinch points from the sensors back to the ECM.Expected Result:All connectors, pins and sockets should be completely coupled and/or inserted and the harness and wiring should be free of corrosion, abrasion or pinch points.Results:
OK - Proceed to Test Step 3.
Not OK - Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.Clear all logged diagnostic codes.STOPTest Step 3. Determine the Condition that is Present
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Monitor the active diagnostic code screen on Cat ET.
Determine if the problem is related to a "voltage high" diagnostic code (open circuit) or a "voltage low" diagnostic code (short circuit).Expected Result:Either a "voltage low" diagnostic code (short circuit) is active or a "voltage high" diagnostic code (open circuit) is active.Results:
Voltage Low (Short) - A "voltage low" diagnostic code (short circuit) is active at this time. Proceed to Test Step 4.
Voltage High (Open) - A "voltage high" diagnostic code (open circuit) is active at this time. Proceed to Test Step 7.Test Step 4. Disconnect the Suspect Sensor
Turn the keyswitch to the OFF position.
Disconnect the sensor with the "voltage low" diagnostic code (short circuit).
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Check for an active "voltage high" diagnostic code (open circuit) for the disconnected sensor.Expected Result:A "voltage high" diagnostic code (open circuit) for the disconnected sensor is now active.Results:
OK - A "voltage low" diagnostic code (short circuit) was active before disconnecting the sensor. A "voltage high" diagnostic code (open circuit) became active after disconnecting the sensor.Repair: Temporarily connect a new sensor.Check for active diagnostic codes.If the new sensor fixes the problem, reconnect the suspect sensor.If the problem returns, permanently install the new sensor.Verify that the repair eliminates the pr