84708M Mariner PLATE

Table 1
Parameters for the Status Screens on Cat ET    
Screen 1
Group 8     Screen 2
Group 9    
"Cylinder #1 Transformer Secondary Output Voltage Percentage"     "Cylinder #2 Transformer Secondary Output Voltage Percentage"    
"Cylinder #3 Transformer Secondary Output Voltage Percentage"     "Cylinder #4 Transformer Secondary Output Voltage Percentage"    
"Cylinder #5 Transformer Secondary Output Voltage Percentage"     "Cylinder #6 Transformer Secondary Output Voltage Percentage"    
"Cylinder #7 Transformer Secondary Output Voltage Percentage"     "Cylinder #8 Transformer Secondary Output Voltage Percentage"    
"Cylinder #9 Transformer Secondary Output Voltage Percentage"     "Cylinder #10 Transformer Secondary Output Voltage Percentage"    
"Cylinder #11 Transformer Secondary Output Voltage Percentage"     "Cylinder #12 Transformer Secondary Output Voltage Percentage"    
"Cylinder #13 Transformer Secondary Output Voltage Percentage"     "Cylinder #14 Transformer Secondary Output Voltage Percentage"    
"Cylinder #15 Transformer Secondary Output Voltage Percentage"     "Cylinder #16 Transformer Secondary Output Voltage Percentage"    
"Cylinder #17 Transformer Secondary Output Voltage Percentage"     "Cylinder #18 Transformer Secondary Output Voltage Percentage"    
"Cylinder #19 Transformer Secondary Output Voltage Percentage"     "Cylinder #20 Transformer Secondary Output Voltage Percentage"    
Start the engine. Apply the normal load at rated speed. Allow the engine to warm up to normal operating temperature.
Observe the value of the output for the secondary circuit of each transformer.Expected Result:The displayed value of the output for the secondary circuit of each transformer is between 1 and 90 percent.Results:
OK - The displayed value of the output for the secondary circuit of each transformer is between 1 and 90 percent. The ignition system components are operating properly.Repair: Investigate other possible root causes of the problem. Troubleshoot the symptom. Refer to Troubleshooting, "Troubleshooting Without A Diagnostic Code". Stop.
Not OK - At least one of the outputs displayed a value of 0 percent or a value that is greater than 90 percent. The ignition system components require maintenance. Proceed to Test Step 2.Test Step 2. Inspect the Transformer
Ignition systems can cause electrical shocks. Avoid contacting the ignition system components and wiring.Do not attempt to remove the valve covers when the engine is operating. The transformers are grounded to the valve covers. Personal injury or death may result and the ignition system will be damaged if the valve covers are removed during engine operation. The engine will not operate without the valve covers.
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.
Illustration 1 g01091169
Section view of the side of a cylinder head (1) Valve cover (2) 2-pin connector (3) Transformer
Remove valve cover (1) of the suspect cylinder.
Pulling on the wiring harness may break the wires. Do not pull on the wiring harness.
Disconnect 2-pin connector (2). Remove transformer (3) from the engine.
Illustration 2 g01091835
Ignition transformer and extension (3) Transformer (4) Screws for the ground spring (5) Ground spring (6) Spacer (7) Secondary terminal for the spark plug (8) Extension (9) O-ring seal
Inspect the body of transformer (3) and ground spring (5). Verify that there is no corrosion nor damage. Verify that the screws for ground spring (4) are secure.
Inspect secondary terminal (7) for corrosion and/or for damage.
Inspect O-ring seal (9) inside extension (8) for damage.
Check for a secure connection between the transformer and the spark plug.Note: Punch through is caused by misfire in the engine that does not generate a diagnostic code.
Check extension (8) near spacer (6) for signs of punch through (pin holes) and/or of arcing.
The extension can be scratched and damaged with a wire brush. Do not use a wire brush on the extension.
Clean any deposits from the inside of the extension. Use a 6V-7093 Brush with isopropyl alcohol.Expected Result:The transformer is in good condition.Results:
OK - The transformer is in good condition. Proceed to Test Step 3.
Not OK - An inspection found a problem with the transformer.