838979 Volvo.Penta Gasket

Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
41-3 8 Volt DC Supply voltage above normal The digital sensor supply voltage is above normal for one second.
The Electronic Control Module (ECM) has been powered for 3 seconds. The code is logged.
All sensors are set to default values.
41-4 8 Volt DC Supply voltage below normal The digital sensor supply voltage is below normal for one second.
The ECM has been powered for 3 seconds.
100-10 Engine Oil Pressure Sensor abnormal rate of change The signal voltage has not changed at a normal rate for 30 seconds.
Engine speed must be above 600 rpm. The code is logged.
The value of the parameter is set to a gauge pressure of 600 kPa (87 psi).
262-3 5 Volt Sensor DC Power Supply voltage above normal The analog sensor supply voltage is above normal for one second.
The ECM has been powered for 3 seconds. The code is logged.
All sensors are set to default values.
262-4 5 Volt Sensor DC Power Supply voltage below normal The analog sensor supply voltage is below normal for one second.
The ECM has been powered for 3 seconds.
1785-10 Intake Manifold Pressure Sensor abnormal rate of change The signal voltage has not changed at a normal rate for 30 seconds.
Engine speed must be above 1000 rpm. The code is logged.
The value of the parameter will be set to 100 kPa (15 psi). System OperationThe ECM supplies a regulated voltage of 5.0 0.2 VDC to the following sensors:
Engine oil pressure sensor
Fuel pressure sensor
Intake manifold pressure sensor
Transmission oil pressure sensor
Transmission oil temperature sensorThe ECM supplies a regulated voltage of 8.0 0.4 VDC to the following sensors:
Coolant level sensor
Exhaust temperature sensorThe supply voltage for the sensors is routed from the ECM to terminal A of each sensor connector. The sensor return for the sensors is routed from the ECM to terminal B of each sensor connector. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.If a -10 code is logged, this indicates that the 5 V supply is not available at the sensor connector. During normal engine operation, each of the signals from the pressure sensors fluctuate slightly. When the 5 V supply becomes unavailable at the pressure sensor connector, the signal from that sensor floats to a midrange value. The signal will not fluctuate. If the signal from the sensor remains abnormally steady for more than 30 seconds, the ECM will activate this code.Note: The sensors are not protected from overvoltage. A short from the supply line to the +Battery may damage the sensors. If any of the 3 diagnostic codes are active, it is possible that a sensor has been damaged. Repair the sensor supply and check for any active sensor diagnostic codes in order to determine if a sensor has failed.
Illustration 1 g06185464
Schematic for the sensor supply circuit
Illustration 2 g06122688
Locations of the components for the sensor supply (typical rear side engine view)
(1) Engine oil pressure sensor
Illustration 3 g06112411
Locations of the components for the sensor supply (typical left side engine view)
(2) Intake manifold pressure sensor
(3) J2/P2 ECM connectors
Illustration 4 g06122651
Locations of the components for the sensor supply (typical left side engine view)
(5) Fuel pressure sensor
Illustration 5 g01373963
Locations of the connectors for the analog sensors and the digital sensors (typical rear engine view)
(6) Connector for the transmission pressure sensor
(7) Connector for the exhaust temperature sensor
(8) Connector for the transmission temperature sensor
Illustration 6 g01374012
Terminal locations at the P2 ECM connector for the sensor supply
(P2-17) Analog return
(P2-29) Digital sensor supply
(P2-54) Analog return
(P2-72) Analog sensor supply
(P2-80) Analog sensor supply
(P2-81) Digital sensor supply
(P2-92) Digital return
(P2-93) Digital return
Illustration 7 g01159881
Terminal locations at the sensor connector for the sensor supply
(Terminal A) Sensor supply
(Terminal B) Sensor return
(Terminal C) Sensor signal
Table 2
Troubleshooting Test Steps Expected Result Result
1. Inspect the Electrical Connectors and the Wiring
A. Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the connectors for sensors (1 through 4). Also, thoroughly inspect connectors (5 through 8).
Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
D. Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
E. Check the harness a