823147A 7 Mercury HARNESS-ADAPTOR-REV LIMITER (USE WHERE APPLICABLE)

Illustration 1 g01045468
Schematic diagram of the electrical power supplyThe engine is not equipped with a remote control panel.
Illustration 2 g01045535
Schematic diagram of the electrical power supplyThe engine is equipped with a remote control panel that only includes a status control module.
Illustration 3 g01045536
Schematic diagram of the electrical power supplyThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
Illustration 4 g01045538
Schematic diagram of the electrical power supplyThe engine is configured for Canadian Standards Association (CSA). The engine is equipped with an optional remote control panel with air/fuel ratio control.Test Step 1. Inspect the Electrical Connectors
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
EIS connectors on the control module
ECM J2/P2 connectors
Connectors for the 24 VDC power supply
Connectors for the engine control
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the electrical power supply.
Check the harness and wiring for abrasion and for pinch points from the power supply to each module.Expected Result: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 Circuit Breakers for Continuity
Measure the resistance across each of the circuit breakers.Expected Result:The resistance is less than 2 Ohms.Results:
OK - The resistance is less than 2 Ohms. The circuit breakers do not have a short circuit. Proceed to Test Step 3.
Not OK - The resistance of a circuit breaker is greater less than 2 Ohms. A circuit breaker is faulty.Repair: Repair the circuit breaker or replace the circuit breaker. Verify that the original problem is resolved.STOPTest Step 3. Check for a Short Circuit
Disconnect the following connectors:
EIS connectors
P1 and P2 connectors for the ECM
P4 connector for the PWM converter
The "+" and "−" connections for the status control module
Disconnect the electronic service tool.
Verify that the engine control is in the OFF/RESET mode.
Measure the resistance between the following terminal strip connections:
Table 1
Resistance Measurements for the Power Supply    
Terminal Strip Connection    Terminal Strip Connection    
5 (−Battery)     1 (+Battery)    
2 (+Battery)
102-107 (Keyswitch)
285 (+Battery for the oxygen buffer)
Measure the resistance between terminal strip connection 5 and the engine block surface.Expected Result:Each check of the resistance is greater than 5 Ohms.Results:
OK - Each check of the resistance is greater than 5 Ohms. The wiring for the power supply does not have a short circuit. Proceed to Test Step 4.
Not OK - At least one check of the resistance is less than 5 Ohms.Repair: Repair the wiring, when possible. Replace parts, if necessary. Verify that the original problem is resolved.STOPTest Step 4. Check the EIS Control Module for a Short Circuit
Connect the EIS connectors.
Measure the resistance between terminal strip connections 5 and 103.Expected Result:The resistance is greater than 5 Ohms.Results:
OK - The resistance is greater than 5 Ohms. The EIS control module does not have a short circuit. If the engine is equipped with an ECM, proceed to Test Step 5. If the engine is equipped with a status control module, proceed to Test Step 7.
Not OK - The resistance is less than 5 Ohms. The EIS control module has a short circuit.Repair: Replace the EIS control module. Refer to Troubleshooting, "Replacing the EIS Control Module".STOP