9051 Mercruiser POWER JET

Table 1
J1939 Code and Description Comments
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.
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.
The code is logged.
1269-5
Engine Ignition Coil #2 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
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.
The code is logged.
1270-5
Engine Ignition Coil #3 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
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.
The code is logged.
1271-5
Engine Ignition Coil #4 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
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.
The code is logged.
1272-5
Engine Ignition Coil #5 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
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.
The code is logged.
1273-5
Engine Ignition Coil #6 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
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.
The code is logged.
1274-5
Engine Ignition Coil #7 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1274-6
Engine Ignition Coil #7 : 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.
1275-5
Engine Ignition Coil #8 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1275-6
Engine Ignition Coil #8 : 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.
1276-5
Engine Ignition Coil #9 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1276-6
Engine Ignition Coil #9 : 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.
1277-5
Engine Ignition Coil #10 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1277-6
Engine Ignition Coil #10 : 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.
1278-5
Engine Ignition Coil #11 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1278-6
Engine Ignition Coil #11 : 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.
1279-5
Engine Ignition Coil #12 : Current Below Normal While the engine is started, the ECM detects a low current flow in the primary circuit for the ignition transformer.
The code is logged.
1279-6
Engine Ignition Coil #12 : 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.
3597-3
ECU Power Output Supply Voltage #1 : Voltage Above Normal Replace the Electronic Control Module (ECM)
3597-4
ECU Power Output Supply Voltage #1 : Voltage Below Normal Replace the Electronic Control Module (ECM) The Electronic Control Module (ECM) has internal circuit drivers for the transformers. The circuit drivers send a signal of +108 volts to the high side of the ignition transformers primary circuits. The transformers deliver high voltage (8000 to 37,000 volts) to the spark plugs. The ignition wiring is continuous from the ECM P2 connector to the connectors for the transformers. The ignition wiring is routed through a rail on the side of the engine.A single problem with a primary circuit will generate one diagnostic code or multiple codes.Circuit Driver SideInternally, the ECM has an individual circuit driver for each transformer. These circuits are wired individually from the ECM J2/P2 connectors to each transformer. If any cylinder circuit driver side has a problem, only that cylinder is affected.Return SideThe current for the return to ground is limited to a single transformer. Therefore a return short circuit to the −Battery side or an open circuit will affect only one cylinder.The ECM has internal returns for the transformers. These returns consist of groups of terminals that are connected via diodes inside the ECM. Therefore a return short circuit to the +Battery side will simultaneously affect all the cylinders that are grouped.RecommendationIf multiple diagnostic codes are active for the primary ignition, troubleshoot the affected circuits one at a time to find the root cause.
Illustration 1 g06489073
For the complete circuit details, refer to the full schematic.
The most likely causes of the diagnostic code are a