41882M Mariner COVER

Illustration 1 g01079998
Schematic for the electrical power supply
Test Step 1. Inspect the Electrical Connectors and Wiring
Illustration 2 g01073505
Terminal box
(1) J1/P1 connectors for the ECM
(2) J16/P16 connectors for the harness to the fuel metering valve
(3) J23 connector for the service tool
(4) 16 amp circuit breaker
(5) 6 amp circuit breaker
(6) J5/P5 connectors for the harness to the ITSM
(7) J9/P9 connector for the wiring to the customer's connections
Set the engine control to the OFF/RESET mode. Switch 16 amp circuit breaker (4) to the OFF position. Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Disconnect the J1/P1 connectors. Inspect the J1 connector and the P1 connector for damage, for corrosion, and for moisture. Reconnect the J1/P1 connectors.
Thoroughly inspect the following connections:
Electrical connections to each of the circuit breakers
Connectors for the 24 VDC power supply
Connections for the engine control
Check the torque of the allen head screw for the ECM connector. The proper torque is 6 1 N m (55 9 lb in).
Illustration 3 g01073509
Harness side of the P1 connector
(P1-52) +Battery
(P1-53) +Battery
(P1-55) +Battery
(P1-57) +Battery
(P1-63) −Battery
(P1-65) −Battery
(P1-67) −Battery
(P1-69) −Battery
(P1-70) Switched +Battery
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the electrical power supply:
Unswitched +Battery terminals 52, 53, 55, and 57
−Battery terminals 63, 65, 67, and 69
Switched +Battery terminal 70
Check the harness and wiring for abrasion and for pinch points from the power supply to the ECM and from the engine control to the ECM. Expected Result:All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary. Ensure that all of the seals are properly installed. Make sure that the connectors are properly fastened. Verify that the repair has eliminated the problem.STOPTest Step 2. Check the Voltage at the Power Supply and at the ECM
Make sure that the engine will not crank during this procedure. For an engine with an electric starting motor, make sure that the battery cables are disconnected from the motor. For an engine with an air starting motor, make sure that the pressurized air supply is OFF. Make sure that the air is purged from the system. Note: If a power supply is used instead of batteries, the minimum voltage for the power supply is 22 VDC at 16 amperes. Troubleshoot the power supply if the voltage is less than 22 VDC or more than 29 VDC.
Measure the voltage at the terminals for the power supply. Record the voltage.
Insert two 7X-1710 Multimeter Probes into the harness side of the P1 connector. Insert the first probe into terminal 52. Insert the second probe into terminal 63. Connect a multimeter to the probes.
Switch the 16 amp circuit breaker ON.
Measure the power supply voltage at the P1 connector. During the measurement, wiggle the harness in order to check for an intermittent problem. Be sure to wiggle the harness near each of the connections. Expected Result:The voltage that is measured at the terminals for the power supply is at least 22 VDC. The voltage that is measured at the P1 connector is within 2 VDC of the voltage that was measured at the terminals for the power supply. The voltage measurements are constant.Results:
OK - The ECM is receiving the correct voltage at the P1 connector.Repair: Perform the following procedure:Switch the 16 amp circuit breaker OFF.Remove the probes from the P1 connector.Proceed to Test Step 3.
Not OK - The ECM is not receiving the correct voltage at the P1 connector.Repair: Perform the following procedure:
Switch the 16 amp circuit breaker OFF.
Remove the probes from the P1 connector.
Use a voltmeter to check the wiring. Refer to the appropriate schematic for the electrical system. Locate the source of the voltage drop.
Make repairs, as needed. STOPTest Step 3. Check the Engine Control
Make sure that the engine will not crank during this procedure. For an engine with an electric starting motor, make sure that the battery cables are disconnected from the motor. For an engine with an air starting motor, make sure that the pressurized air supply is OFF. Make sure that the air is purged from the system.
Connect Cat ET to the service tool connector.
Switch the 16 amp circuit breaker. Note: An "E225 Engine Overcrank" and/or an "E233 Low Engine Prelube Pressure" event code may be generated during this step. After you have completed this step, clear the events from the "Logged Events" screen of Cat ET.
Observe the "Active Diagnostic" screen on Cat ET and set the engine control to the STOP mode, the START mode, and the AUTO mode. Look for an active "336-02 Incorrect ECS Switch inputs" diagnostic code. Repeat this step several times. Expected Result:A "336-02 Incorrect ECS Switch inputs" diagnostic code was not activated when the engine control was set to the STOP mode, the START mode, and the AUTO mode.Results:
OK - A "336-02 Incorrect ECS Switch inputs" diagnostic code was not activated. The inputs from the engine control are correct. The problem seems to be resolved.Repair: The problem may be intermittent. Refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - A "336-02 Incorrect ECS Switch inputs" diagnostic code was activated. The ECM has detected an invalid pattern for the inputs from the engine control. Proceed to Test Step 4.Test Step 4. Check the Circuit of the Engine Control