20563999 Volvo.Penta Screw

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Left side engine view (typical view)
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Schematic
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P2 ECM connectorTest Step 1. Check for Active Diagnostic Codes and Logged Diagnostic Codes
Connect Cat ET to the data link connector.
Turn the key switch to the ON position.
Check for one of the following logged diagnostic codes or active diagnostic codes:
64-02 Secondary Engine Speed loss of signal (34)
64-11 Secondary Engine Speed no pattern (34)
190-02 Secondary Engine Speed Loss of Signal (34)
190-11 Secondary Engine Speed no pattern (34)Note: If the diagnostic code is logged but not active, run the engine until the engine is at normal operating temperature. The problem may only occur when the engine is at the normal operating temperature. If the engine will not start, monitor the engine rpm from Cat ET while the engine is being cranked. Cat ET may need to be powered from another battery while the engine is being cranked. This is done in order to ensure that Cat ET does not reset.Expected Result:One or more of the diagnostic codes that are listed above are logged or active.Note: If you have been directed here from Troubleshooting, "Troubleshooting without a Diagnostic Code" for the following reason, select "No Engine rpm":
The engine rpm was not indicated on Cat ET.Results:
OK - There is an active diagnostic code or a logged diagnostic code. Proceed to Test Step 3.
Not OK - If none of the codes that are listed are active diagnostic codes or logged diagnostic codes and the engine is not running properly, refer to the appropriate symptoms in the service manual.STOP
No Engine rpm - Engine rpm is not indicated on Cat ET. Proceed to Test Step 2.Test Step 2. Check the Installation of the Sensors and the Bracket
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Flange of the sensor and mounting bracket
The flange of the sensor should be flush against the engine in order to ensure proper operation.
Inspect the bracket in order to ensure that the installation allows the flange of the sensor to be flush against the engine.Verify that the bracket is not bent.Note: The bracket cannot be replaced separately.
Ensure that one O-ring has been installed on the sensor, and ensure that the O-ring is free of damage.Note: If the flange of the sensor is bent or if an obstruction is preventing the sensor from reading a good pattern, the engine will not start.Results:
OK - The sensors and the bracket are properly installed. Proceed to Test Step 3.
Not OK - Repair: Perform the following procedure in order to properly install the sensors and the bracket:
Loosen the bolt that holds the sensor mounting bracket to the engine.
Seat the sensor and tighten the bolt.If the sensor will not seat, repair the sensor or replace the sensor, as required.Note: The sensor must not be removed from the bracket.
Ensure that the sensor is properly oriented and that the harness is secured in the proper location.
Verify that the repair eliminates the problem.STOPTest Step 3. Measure the Sensor Resistance Through the Engine Harness
Turn the key switch to the OFF position.
Thoroughly inspect ECM vehicle harness connector J2/P2. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on the following wires in the ECM engine harness connector P2 that are associated with the engine speed/timing sensors:
P2:48
P2:49
P2:58
P2:59
Ensure that the latch tab on the connector is properly latched and ensure that the latch tab is fully latched.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Repair the harness or repair the connector if a problem is found.
Ensure that the wiring harness is correctly routed and secured at the proper locations.
Ensure that the harness wiring is not pulled too tightly. When the harness wiring is pulled too tightly, vibrations or movement can cause intermittent connections.
Inspect the harness wiring for nicks and abrasions.
If the harness and the connector are OK, disconnect ECM connector J2/P2.
Primary engine speed/timing sensor
Use a multimeter to measure the resistance from P2:48 (Primary Engine Speed/Timing +) to P2:49 (Primary Engine Speed/Timing -).
Check for an intermittent open circuit or short circuit by moving the harness while the measurement for resistance is being taken. Pull the wires that are directly behind the sensors or shake the wires that are directly behind the sensors.Resistance ... 75 to 230 Ohms
Secondary engine speed/timing sensor
Use a multimeter to measure the sensor resistance (Ohms) from P2: 58 (Secondary Engine Speed/Timing +) to P2:59 (Secondary Engine Speed/Timing -).
Check for an intermittent open