0209092 JOHNSON OWNER'S MANUAL 70-75 (EXCEPT TRIM)

Table 1
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
301-5 Ignition Transformer Primary #1 : Current Below Normal
302-5 Ignition Transformer Primary #2 : Current Below Normal
303-5 Ignition Transformer Primary #3 : Current Below Normal
304-5 Ignition Transformer Primary #4 : Current Below Normal
305-5 Ignition Transformer Primary #5 : Current Below Normal
306-5 Ignition Transformer Primary #6 : Current Below Normal
307-5 Ignition Transformer Primary #7 : Current Below Normal
308-5 Ignition Transformer Primary #8 : Current Below Normal
309-5 Ignition Transformer Primary #9 : Current Below Normal
310-5 Ignition Transformer Primary #10 : Current Below Normal
311-5 Ignition Transformer Primary #11 : Current Below Normal
312-5 Ignition Transformer Primary #12 : Current Below Normal
313-5 Ignition Transformer Primary #13 : Current Below Normal
314-5 Ignition Transformer Primary #14 : Current Below Normal
315-5 Ignition Transformer Primary #15 : Current Below Normal
316-5 Ignition Transformer Primary #16 : Current Below Normal
1752-5 Ignition Transformer Primary #17 : Current Below Normal
1753-5 Ignition Transformer Primary #18 : Current Below Normal
1754-5 Ignition Transformer Primary #19 : Current Below Normal
1755-5 Ignition Transformer Primary #20 : Current Below Normal     While the engine is started, the Electronic Control Module (ECM) detects a low current flow in the primary circuit for the ignition transformer.     The code is logged.
The alarm output is activated.    
Table 2
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
301-6 Ignition Transformer Primary #1 : Current Above Normal
302-6 Ignition Transformer Primary #2 : Current Above Normal
303-6 Ignition Transformer Primary #3 : Current Above Normal
304-6 Ignition Transformer Primary #4 : Current Above Normal
305-6 Ignition Transformer Primary #5 : Current Above Normal
306-6 Ignition Transformer Primary #6 : Current Above Normal
307-6 Ignition Transformer Primary #7 : Current Above Normal
308-6 Ignition Transformer Primary #8 : Current Above Normal
309-6 Ignition Transformer Primary #9 : Current Above Normal
310-6 Ignition Transformer Primary #10 : Current Above Normal
311-6 Ignition Transformer Primary #11 : Current Above Normal
312-6 Ignition Transformer Primary #12 : Current Above Normal
313-6 Ignition Transformer Primary #13 : Current Above Normal
314-6 Ignition Transformer Primary #14 : Current Above Normal
315-6 Ignition Transformer Primary #15 : Current Above Normal
316-6 Ignition Transformer Primary #16 : Current Above Normal
1752-6 Ignition Transformer Primary #17 : Current Above Normal
1753-6 Ignition Transformer Primary #18 : Current Above Normal
1754-6 Ignition Transformer Primary #19 : Current Above Normal
1755-6 Ignition Transformer Primary #20 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.     The code is logged.
The alarm output is activated.    Note: The engine must be running in order for the above diagnostic codes to become active.Systems OperationBoth the master ECM and the slave ECM have internal power circuits that are used to energize the primary circuits for the ignition transformers. The master ECM energizes the primary circuits for the cylinders with an even number. The slave ECM energizes the primary circuits for the cylinders with an odd number. Each power circuit creates a signal of 108 volts. The signal goes to the primary circuits of the ignition transformers. The secondary circuits for the ignition transformers deliver high voltage (8,000 to 37,000 volts) to the spark plugs. The external ignition wiring is continuous from the ECM connector to the bulkhead connectors that are located on the front face of the engine. The ignition wiring is inside the engine from the bulkhead connector to the individual transformers.Some power circuits and returns are shared. Therefore, a single problem will generate either only one diagnostic code or multiple codes.Power for the Ignition Transformer PrimarySome power circuits send signals to a single cylinder. A high side short circuit will affect only that cylinder.Some power circuits send signals to more than one cylinder. For this reason, a high side short circuit will affect more than one cylinder.Return for the Ignition Transformer PrimaryBoth the master ECM and the slave ECM have internal returns for the ignition transformers on the left side of the engine. Some of the returns consist of groups of terminals that are connected via diodes inside the master ECM. This means that a return short circuit to the +Battery will simultaneously affect all of the cylinders that are grouped.For the combinations of cylinders that can be affected by a condition, refer to Table 3.
Table 3
Diagnostic Conditions and the Combinations of Cylinders that are Affected    
Diagnostic Condition    Cylinders    
Open in the power circuit     Only one cylinder is affected.    
Open in the return circuit    
Short to ground in the return circuit    
Short to +Battery in the power circuit for cylinders 1, 2, 7, 8, 9, 10, 11, 12, 17, 18, 19, or 20    
Short to ground in the power circuit for cylinders 1, 2, 7, 8, 9, 10, 11, 12, 17, 18, 19, or 20    
Short to +Battery in the return circuit for cylinders 5, 6, 13, or 14    
Cylinder 3 or 5
Short to +Battery in the power circuit     3 and 5    
Cylinder 4 or 6
Short to +Battery in the power circuit     4 and 6    
Cylinder 13 or 15
Short to +Battery in the power circuit     13 and 15    
Cylinder 14 or 16
Short to +Battery in the power circuit     14 and 16    
Short to +Battery in the return circuit     1, 3, 7, and 9    
11, 15, 17, and 19
2, 4, 8, and 10
12, 16, 18, and 20 Because the circuits are in pairs or groups, multiple diagnostic codes can be activated for a single problem. If multiple diagnostic codes are active