820844 Volvo.Penta Tube

Table 1
Diagnostic Code    
Code and Description    Flash Code    Default Conditions which Generate this Code    System Response    
106-01 Low Atmospheric Pressure     26     The atmospheric pressure is valid, but the pressure is below 0.68 VDC. This is a normal occurrence at altitudes above
1500 m (4921 ft).     The diagnostic code is logged. Also, the low oil pressure lamp is illuminated. The low atmospheric pressure or the high altitude derate is active.    
106-03 Atmospheric Pressure voltage high     26     Voltage is above 4.8 VDC for one second. Also, there are no sensor supply diagnostic codes.     The diagnostic code is active and logged. The ECM will use a default value of
100 kPa (14.5 psi). This value will also be displayed on an electronic service tool.    
106-04 Atmospheric Pressure voltage low     26     The atmospheric pressure signal voltage is less than 0.2 VDC for at least one second. Also, there are no sensor supply diagnostic codes.     The diagnostic code is active and logged. The ECM will use a default value of
100 kPa (14.5 psi). This value will also be displayed on an electronic service tool.    
106-10Atmospheric Pressure signal rate of change     26     The Atmospheric pressure is changing abnormally.     The diagnostic code is logged if the engine has been running for 15 seconds.    
Illustration 1 g01625935
Illustration 2 g01635455
(30) +5 VDC (34) Atmospheric pressure (35) Analog returnTest Step 1. Inspect the Electrical Connectors and the Wiring Harness
Remove electrical power from the ECM.
Thoroughly inspect the connector for the atmospheric pressure sensor and the P15 connector. Inspect the ECM connector J14/P14. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the atmospheric pressure sensor.
Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or the wiring.Repair: Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Open or Short Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Turn the engine control switch to the ON position. The engine should remain off.
Check for active diagnostic codes 106-03 or 106-04.Expected Result:There are no active diagnostic codes.Results:
OK - There are no active diagnostic codes. Proceed to Test Step 5.
Not OK - The service tool shows a short circuit. Proceed to Test Step 4.
Not OK - The service tool shows a open circuit. Proceed to Test Step 3.Test Step 3. Check for Opens in the Wiring
Remove electrical power from the ECM.
Disconnect the J14/P14 ECM connector and the connector for the atmospheric pressure sensor.
Measure the resistance between the following terminals:
P14-30 (ECM connector) to pin J15-A on the connector for the atmospheric pressure sensor
P14-35 (ECM connector) to pin J15-B on the connector for the atmospheric pressure sensor
P14-34 (ECM connector) to pin J15-C on the connector for the atmospheric pressure sensorResults:
OK - The resistance indicates a short circuit. There are no opens in the wiring. Proceed to Test Step 4.
Not OK - The resistance indicates an open circuit. There is an open circuit or excessive resistance in the harness or the connectors.Repair: Repair the circuit.Verify that the repair eliminates the problem.STOPTest Step 4. Check the Wiring for a Short Circuit
Measure the resistance between the following terminals:Note: Wiggle the harness during the following measurements in order to reveal an intermittent condition.
P14-30 (ECM connector) to pin J15-B and pinP14-30 (ECM connector) to J15-C on the connector for the atmospheric pressure sensor
P14-35 (ECM connector) to pin J15-C and P14-35 (ECM connector) to pin J15-A on the connector for the atmospheric pressure sensor
P14-34 (ECM connector) to pin J15-B and P14-34 (ECM connector) to pin J15-A on the connector for the atmospheric pressure sensorExpected Result:Each check of the resistance indicates an open circuit.Results:
OK - Each check of the resistance indicates an open circuit. Proceed to Test Step 5.
Not OK - At least one check of the resistance does not indicate an open circuit. There is a problem in the harness. There may be a problem in a connector.Repair: Repair the wire and/or the connector, when possible. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 5. Check the Supply Voltage at the Sensor Connector
Disconnect the atmospheric pressure sensor.
Restore electrical power to the ECM.
Illustration 3 g01356605
Harness connector for the atmospheric pressure sensor (A) +5 VDC (B) Return (C) Signal
Measure the voltage between terminals (A) and ( B) at the harness connector for the atmospheric pressure sensor.
Remove electrical power from the ECM.Expected Result:The voltage measurement is +5.0 0.25 VDC.Results:
OK