83030M Mariner SWITCH BOX ASS'Y

Table 1
Diagnostic Codes for the Primary Ignition Circuits    
Code    Conditions Which Can Cause the Code    
300-03     A low side wire is shorted to a positive voltage source.
The control module cannot determine the cylinder because all of the low side wires are connected together. You must determine the particular low side wire that has the short circuit.    
300-04     A low side wire is shorted to ground or −Battery.
The control module cannot determine the cylinder because all of the low side wires are connected together. You must determine the particular low side wire that has the short circuit.    
301-05 through 312-05     There is an open in the primary ignition circuit. The open circuit could be in a wire, in a transformer, or inside the control module.    
301-06 through 312-06     A high side wire is shorted to positive voltage source or to ground. Alternatively, the control module may be faulty or there may be a short in the transformer.    
301-12 through 312-12     A high side wire is shorted to a low side wire.
The transformer may have a short circuit.
Alternatively, the control module may be faulty.    The control module will not shut down the engine for a faulty ignition circuit. The engine will continue to run. However, these conditions may lead to misfire which can cause lugging of the engine. Lugging of the engine can cause a shutdown.The most likely causes of the diagnostic code are a poor electrical connection or a problem in a wiring harness. The next likely cause is a problem with an ignition transformer. The least likely cause is a problem with the EIS control module.
Illustration 1 g01173415
Schematic diagram for the primary ignition for the 12 cylinder engine
Illustration 2 g01173420
Schematic diagram for the primary ignition for the 8 cylinder engineTest Step 1. Inspect the Electrical Connectors and the Wiring
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 for the EIS control module
Bulkhead connector
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the primary ignition circuits.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.STOPTest Step 2. Check for Diagnostic Codes for the Primary Circuits
Connect the Digital Diagnostic Tool (DDT) to a service tool connector.
Restore the electrical power to the engine.
Attempt to start the engine. Use the DDT in order to determine if the following codes are activated:
300-03 Primary Return short to +batt
300-04 Primary Return short to ground
301-05 Ignition Transformer Primary #1 open circuit through 312-05 Ignition Transformer Primary #12 open circuit
301-06 Ignition Transformer Primary #1 short through 312-06 Ignition Transformer Primary #1 short
301-12 Ignition Transformer Primary #1 short to return through 312-12 Ignition Transformer Primary #1 short to returnNote: If a diagnostic code for the primary circuit is not currently activated, attempt to repeat the condition that activated the code. Run the engine to full operating temperature.Expected Result:None of the above diagnostic codes are activated.Results:
No Code - The primary ignition is working properly.STOP
-03 code or a -04 code - A low side wire has a short circuit. Proceed to Test Step 3.
-05 code - There is an open circuit. Proceed to Test Step 5.
-06 code or a -12 code - A high side wire has a short circuit. Proceed to Test Step 7.Test Step 3. Check the Low Side Wires for a Short Circuit
Set the engine control to the OFF/RESET mode.
Remove the electrical power from the engine.
Disconnect the EIS connector.
Table 2 lists the terminations for the low side wires at the EIS connector. The table can be used to identify the particular wire that has a short circuit.
Table 2
Terminals for the Low Side Wires at the EIS Connector    
Cyl    Number of Cyl    
8 12    
1     n     n    
2     y     x    
3     z     q    
4     w     t    
5     x     p    
6     p     u    
7     v     e    
8     t     z    
9         w    
10         y    
11         v    
12