MAGNETO ASSEMBLY 1S3350 - Caterpillar

Illustration 8 g01071169
Left side views of a 50 Hz engine and a 60 Hz engine
(9) Sensor for atmospheric pressure (if equipped)
Check the harness and wiring for abrasion and for pinch points from each 8 volt sensor 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 sockets are not connected properly. At least one of the connectors and/or the wiring has corrosion, abrasion, and/or pinch points.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Check for Diagnostic Codes
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. Wait at least 30 seconds so that any codes may become activated. Look for these codes:
41-03 8 Volt DC Supply short to +batt
41-04 8 Volt DC Supply short to ground
Observe the "Logged Diagnostic" screen on Cat ET. Look for the same codes. Expected Result:The 41-03 code or the 41-04 code is not active.Results:
No codes - The 41-03 code or the 41-04 code is not active. The +8 volt sensor supply is operating correctly at this time.STOP
Active code - The 41-03 code or the 41-04 code is active. Proceed to Test Step 3.
Logged code - The 41-03 code or the 41-04 code is not active. However, there is at least one logged code for the 8 volt sensor supply.Repair: There may be a problem with the wiring and/or a connector. Refer to Troubleshooting, "Inspecting Electrical Connectors".Verify that the wiring and/or connectors are OK. Check for diagnostic codes again. Proceed to Test Step 3, if necessary.Test Step 3. Disconnect the 8 Volt Sensors and Look for Active Diagnostic Codes
Turn on the "Active Diagnostic" screen on Cat ET. Verify that the "41-03" or "41-04" code is active.
Disconnect each 8 volt sensor one at a time. After you disconnect each sensor, wait for at least 30 seconds and then observe the "Active Diagnostic" screen on Cat ET. Note: An "Open Circuit" code will be generated for each sensor that is disconnected. This is normal. Clear the codes after you complete this procedure.Expected Result:The original "8 Volt DC Supply" diagnostic code is deactivated when a particular sensor is disconnected.Results:
Yes - The original "8 Volt DC Supply" diagnostic code is deactivated when a particular sensor is disconnected. The sensor and/or the wiring for the sensor has a short circuit.Repair: Perform the following procedure:
Reconnect the suspect sensor. Verify that the diagnostic code recurs.
Disconnect the suspect sensor. Verify that the diagnostic code is deactivated. If these conditions are true, repair the sensor or the sensor's harness. Replace parts, if