95461M Mariner SCREW

Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
41-38 Volt DC Supply : Voltage Above Normal The 8 VDC sensor supply voltage is above normal for one second.
The ECM has been powered for three seconds. The code is logged.
All sensors are set to default values.
41-48 Volt DC Supply : Voltage Below Normal The 8 VDC sensor supply voltage is below normal for one second.
The ECM has been powered for three seconds. The code is logged.
All sensors are set to default values.
100-10 Engine Oil Pressure Sensor abnormal rate of change The signal voltage has not changed at a normal rate for thirty 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 three 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 three seconds.
1785-10 Intake Manifold Pressure Sensor abnormal rate of change The signal voltage has not changed at a normal rate for thirty 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
Atmospheric pressure sensorThe supply voltage for the analog sensors is routed from the ECM to terminal 1 of each sensor connector. The analog sensor return for the sensors is routed from the ECM to terminal 2 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 g01422023
Schematic for the sensor supply circuit
Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM. Turn the keyswitch to the OFF position.
Illustration 2 g01422087
Sensor locations for the analog sensor supply
(1) Intake manifold pressure sensor
(2) Fuel pressure sensor
(3) Atmospheric pressure sensor
(4) Engine oil pressure sensor
(5) J2/P2 ECM connectors
Thoroughly inspect the connectors for the analog sensors (1 through5). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01422088
P2 ECM connector
(P2-15) Intake manifold pressure sensor
(P2-17) Analog sensor return
(P2-28) Engine oil pressure sensor
(P2-40) Fuel pressure sensor
(P2-57) Atmospheric pressure sensor
(P2-72) Analog sensor supply
Illustration 4 g01422120
Sensor connector
(1) Analog sensor supply
(2) Analog sensor return
(3) Sensor signal
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and for pinch points from the sensors back to the ECM. Expected Result:All connectors, pins, and sockets are coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with 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 coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check for Active Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes. Look for the following diagnostic codes:
100-10
262-3
262-4
1785-10Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic code is active.Repair: The problem is no longer present. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The 100-10 or 1785-10 diagnostic code is logged at this time. The analog sensor supply is not reaching the sensor. Proceed to Test Step 3.
Not OK - A 262-3 or 262-4 diagnostic code is active at this time. There is a problem with the sensor supply for the analog sensors. Proceed to Test Step 4.Test Step 3. Check the Supply Voltage at the Sensor Connector
Disconnect the harness connectors of the sensor for the diagnostic code.
Restore the electrical power to the ECM. Note: Be sure to wiggle the harness during the following measurements in order to reveal an intermittent condition.
Measure the voltage between terminals 1 and 2 at the connector.
Remove the electrical power from the ECM.
Connect all of the sensors. Expected Result:The voltage measurement is 5.0 0.2 VDC.Results:
OK - The voltage measurement is 5.0 0.2 VDC.Repair: The analog sensor supply is reaching the sensor connector. There may be a problem with the sensor. Perform the following procedure:
Clear all diagnostic codes.
Run the engine. Allow the engine to warm up. Use Cat ET to check for diagnostic codes that have become active or logged. If the code becomes active or logged, the sensor is faulty. Replace the sensor. Verify that t