850137 Volvo.Penta Control unit

Illustration 1 g01800518
Typical example of the schematic for the sensors
Illustration 2 g01458448
Typical view of the pin locations on the P2 connector for the pressure sensors (38) Ground (GND) Intake Manifold Pressure Sensor (39) Ground (GND) Oil Pressure Sensor (40) Ground (GND) Fuel Rail Pressure Sensor (46) Voltage supply (5 V) Intake Manifold Pressure Sensor (47) Voltage supply (5 V) Oil Pressure Sensor (48) Voltage supply (5 V) Fuel Rail Pressure Sensor (51) Signal (SIG) Fuel Rail Pressure Sensor (55) Signal (SIG) Intake Manifold Pressure Sensor (56) Signal (SIG) Oil Pressure Sensor
Illustration 3 g01170309
Fuel rail pressure sensor (1) Voltage supply (Vs) (2) Ground (GND) (3) Signal (SIG)
Illustration 4 g01170310
Intake manifold pressure sensor (1) Voltage Supply (Vs) (2) Ground (GND) (3) Signal (SIG)
Illustration 5 g01170311
Typical example of the oil pressure sensor (1) Voltage Supply (Vs) (2) Ground (GND) (3) Signal (SIG)The troubleshooting procedures for the diagnostic codes of each pressure sensor are identical. The pressure sensors are active sensors. The pressure sensor has three terminals. Active sensors require supply voltage from the ECM. The P2/J2 ECM connector supplies +5 V to terminal 1 of each sensor. The common line is connected to each sensor connector terminal 2. The signal voltage from terminal 3 of each sensor is supplied to the appropriate terminal at the P2/J2 ECM connector.Test Step 1. Verify All Active Diagnostic Codes
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Verify if any of the following diagnostic codes are active:
0100-03 Engine Oil Pressure Sensor voltage above normal
0100-04 Engine Oil Pressure Sensor voltage below normal
0100-10 Engine Oil Pressure Sensor abnormal rate of change
1785-03 Intake Manifold Pressure Sensor voltage above normal
1785-04 Intake Manifold Pressure Sensor voltage below normal
1785-10 Intake Manifold Pressure Sensor abnormal rate of change
1797-03 Fuel Rail Pressure Sensor voltage above normal
1797-04 Fuel Rail Pressure Sensor voltage below normalExpected Result:One or more of the preceding diagnostic codes are active.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Do not use this procedure if 1785-10 or 0100-10 diagnostic codes are active. Refer to Troubleshooting, "5 Volt Sensor Supply Circuit - Test". When this test is complete, return to the start of this test. If the preceding codes are logged, an intermittent condition may be causing the logged codes. Refer to Troubleshooting, "Electrical Connectors - Inspect".Perform a "Wiggle Test" by using the electronic service tool in order to identify intermittent connections.STOPTest Step 2. Inspect Electrical Connectors And Wiring
Thoroughly inspect the terminal connections on the P2/J2 ECM connectors.
Thoroughly inspect the following connectors for the engine pressure sensors:
P201 Engine Oil Pressure Sensor
P228 Fuel Rail Pressure Sensor
P200 Intake Manifold Pressure Sensor
Refer to Troubleshooting, "Electrical Connectors - Inspect".
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.
Check the screw for the ECM connector for the correct torque of 5 N m (44 lb in).
Check the harness for abrasions and for pinch points from the sensors back to the ECM.
Use the electronic service tool to perform a "Wiggle Test". The "Wiggle Test" will identify intermittent connections.Expected Result:All connectors, pins, and sockets are completely coupled and inserted. The harness should be free of corrosion, abrasions, and pinch points.Results:
OK - Proceed to Test Step 3.
Not OK - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 3. Verify that the Diagnostic Code is Still Active
Turn the keyswitch to the ON position. Wait at least 10 seconds for activation of the diagnostic codes.
Use the electronic service tool to check for active diagnostic codes. Record all active diagnostic codes.
Determine if the fault is related to an open circuit diagnostic code or a short circuit diagnostic code.Expected Result:Either a short circuit diagnostic code is active or an open circuit diagnostic code is active.Results:
OK - Short Circuit - A voltage below normal diagnostic code is active at this time. Proceed to Test Step 4.
OK - Open Circuit - A voltage above normal diagnostic code is active at this time. Proceed to Test Step 5.
Not OK - A short circuit diagnostic code is not active. An open ci