DOOR GP-CAB 8X4527 - Caterpillar

Illustration 5 g01227822
P2 ECM connector
(P2-36) Turbocharger outlet pressure sensor
(P2-37) Atmospheric sensor
(P2-38) Left turbocharger inlet pressure sensor
(P2-39) Right turbocharger inlet pressure sensor
(P2-46) Crankcase pressure sensor
Illustration 6 g01159881
Sensor connector
(Terminal A) Sensor supply
(Terminal B) Sensor return
(Terminal C) Signal Test Step 1. Check for "Active" or "Logged" Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Determine if a diagnostic code has occurred several times. Note: A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and a pin in a connector or a bad connection between a wire and a terminal.
Determine if the problem is active and related to one of the following diagnostic codes:
-3
-4Expected Result:A diagnostic code has occurred several times.Results:
OK - A diagnostic code has occurred several times. Proceed to Test Step 2.
Not OK - An active -3 diagnostic code is present. Proceed to Test Step 3.
Not OK - An active -4 diagnostic code is present. Proceed to Test Step 5.Test Step 2. Perform the "Wiggle Test" on Cat ET
Select the "Wiggle Test" from the diagnostic tests on Cat ET.
Choose the appropriate group of parameters to monitor.
Press the "Start" button. Wiggle the wiring harness for the suspect sensor in order to reproduce an intermittent problem. If an intermittent problem is detected, the status will be highlighted and an audible beep will be heard.Expected Result:No intermittent problems were detected during the "Wiggle Test".Results:
OK - No intermittent problems were found. The harness and connectors appear to be OK. If a diagnostic code is still active, proceed to Test Step 1 and continue to troubleshoot the active diagnostic code.
Not OK - At least one intermittent problem was indicated.Repair: Repair the harness or the connector. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors". Verify that the repair eliminates the problem.STOPTest Step 3. Check the Supply Voltage at the Sensor Connector
Remove electrical power from the ECM.
Disconnect the suspect sensor(s) at the sensor connector:
Restore electrical power to the ECM.
Measure the voltage on the engine harness between terminal A and terminal B of the connector for the suspect sensor. Expected Result:The supply voltage is 5.0 0.2 VDC.Results:
OK - The voltage is 5.0 0.2 VDC. Proceed to Test Step 4.
Not OK - The voltage is not 5.0 0.2 VDC. Proceed to Test Step 7.Test Step 4. Create a Short at the Sensor Connector
Remove electrical power from the ECM.
Disconnect the suspect sensor.
Use a wire jumper in order to create a short between terminal C (signal) and terminal B (sensor return) at the sensor connector.
Restore electrical power to the ECM.
Monitor the diagnostic codes on Cat ET. Check for an active -4 diagnostic code for the suspect sensor. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
Remove electrical power from