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Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
1268-5 Engine Ignition Coil #1 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1268-6 Engine Ignition Coil #1 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    
1269-5 Engine Ignition Coil #2 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1269-6 Engine Ignition Coil #2 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    
1270-5 Engine Ignition Coil #3 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1270-6 Engine Ignition Coil #3 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    
1271-5 Engine Ignition Coil #4 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1271-6 Engine Ignition Coil #4 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    
1272-5 Engine Ignition Coil #5 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1272-6 Engine Ignition Coil #5 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    
1273-5 Engine Ignition Coil #6 : 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 amber warning lamp is illuminated.
The red stop lamp is illuminated.    
1273-6 Engine Ignition Coil #6 : Current Above Normal     While the engine is started, the ECM detects an excessive current flow in the primary circuit for the ignition transformer.    Note: The engine must be running in order for the above diagnostic codes to become active.Systems OperationThe ECM has internal power circuits that are used to energize the primary circuits for the ignition transformers. Each power circuit creates a signal of 108 v. The signal is sent from the ECM to the primary circuits of the ignition transformers. The secondary circuits for the ignition transformers deliver high voltage (8,000 to 37,000 v) to the spark plugs. The external ignition wiring is continuous from the ECM connector to each terminal that is for the ignition transformers.Some power circuits and returns are shared. Therefore, a single problem will generate either only one diagnostic code or multiple codes.Power and Return for the Ignition Transformer PrimaryThe power circuits that are internal to the ECM send signals to more than one cylinder. For this reason, a high side short circuit or a low side short circuit may affect more than one cylinder.The return circuits that are internal to the ECM send signals to a single cylinder.For the combinations of cylinders that can be affected by a condition, refer to Table 2.
Table 2
Diagnostic Conditions and the Combinations of Cylinders that are Affected    
Diagnostic Condition    Cylinders    
The power circuit for a single transformer shorted to the return circuit for that transformer.     Only one cylinder is affected.    
Short to engine ground for the power circuit for cylinders 1, 2, or 5.     Transformers for cylinders 1, 2, and 5 will not be powered.    
Short to engine ground for the power circuit for cylinders 3, 4, or 6.     Transformers for cylinders 3, 4, and 6 will not be powered.    
Short to engine ground in a return circuit for cylinders 1, 2, or 5.     The other transformers for cylinders 1, 2, and 5 will receive half of the normal current for ignition.    
Short to engine ground in a return circuit for cylinders 3, 4, or 6.     The other transformers for cylinders 3, 4, and 6 will receive half of the normal current from the ECM.    
Short to the +Battery for the power circuit for cylinders 1, 2, or 5.     This problem may cause an engine misfire that is caused by a weak spark for the remainder of cylinders 1, 2, and 5.    
Short to the +Battery for the power circuit for cylinders 3, 4, or 6.     This problem may cause an engine misfire that is caused by a weak spark for the remainder of cylinders 3, 4, and 6.    
Short to the +Battery for the return circuit for cylinders 1, 2, or 5.     This problem may cause an engine misfire for the affected cylinder.    
Short to the +Battery for the return circuit for cylinders 3, 4, or 6.    Because the circuits are organized in banks, multiple diagnostic codes can be activated for a single problem. If multiple diagnostic codes are active, troubleshooting the circuits one at a time is an effective