20792103 Volvo.Penta Snap ring

Illustration 1 g00838468
Typical schematic
Illustration 2 g01090524
P1 ECM connector (P1-29) Digital return (P1-30) Analog return (P1-31) Crankcase pressure (P1-35) 8 V digital supply (P1-36) 5 V analog supply (P1-37) Unfiltered engine oil pressure (P1-39) Engine fan speed
Illustration 3 g01072915
P2 ECM connector (P2-1) Right exhaust temperature (P2-2) Right turbocharger inlet pressure (P2-3) Intake air temperature (P2-8) Filtered engine oil pressure (P2-9) Coolant temperature (P2-14) Aftercooler temperature (P2-15) Left turbocharger inlet pressure (P2-20) Atmospheric pressure (P2-23) Turbocharger outlet pressure (P2-25) Left exhaust temperatureTest Step 1. Inspect Electrical Connectors and Wiring
Turn the keyswitch to the OFF position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the sensor connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.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.STOPTest Step 2. Check the Sensor Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect the suspect sensor.
Turn the keyswitch to the ON position. The engine should be off.
Measure the voltage between terminal A and terminal B of the sensor connector.Expected Result:The supply voltage is 5.0 0.2 VDC for all analog sensors and 8.0 0.4 for all digital sensors.Results:
OK - The supply voltage is 5.0 0.2 VDC for all analog sensors and 8.0 0.4 for all digital sensors. The voltage is correct. Proceed to Test Step 3.
Not OK - The supply voltage is not 5.0 0.2 VDC for all analog sensors and 8.0 0.4 for all digital sensors. The voltage is out of the correct range.Repair: If the analog supply voltage is incorrect, refer to Troubleshooting, "Analog Sensor Supply".If the digital supply voltage is incorrect, refer to Troubleshooting, "Digital Sensor Supply".STOPTest Step 3. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the cab service tool connector J42. Start Cat ET.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:Determine the failure mode identifier (FMI) of the diagnostic code. The FMI is one of the following: 00, 03, 04 and 08.An active code is not present but the output signal is suspect.Results:
FMI 00 - A diagnostic code with a FMI of 00 is present. Proceed to Test Step 4.
FMI 03 - A diagnostic code with a FMI of 03 is present. Proceed to Test Step 5.
FMI 04 - A diagnostic code with a FMI of 04 is present. Proceed to Test Step 7.
FMI 08 - A diagnostic code with a FMI of 08 is present. Proceed to Test Step 10.
No Active Code - A diagnostic code is not active but the output signal is suspect. Proceed to Test Step 5.Test Step 4. Check for Signal Voltage at the Connector for the Turbocharger Compressor Outlet Pressure SensorNote: The 273-00 diagnostic code detects a valid signal voltage on the signal wire for the turbocharger compressor outlet pressure sensor when a signal voltage should not be present. The signal voltage may be present from a short in the harness or a faulty sensor. If the 273-00 diagnostic code is active, the turbocharger compressor outlet pressure is set to a default value of 0 kPa (0 psi).
Turn the keyswitch to the OFF pos