MANIFOLD 7M7739 - Caterpillar

Use this procedure to troubleshoot a suspected problem with an ignition transformer. Also use this procedure if one of the diagnostic codes in Table 1 or Table 2 are active or easily repeated.
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.