MBE 900 DDEC VI Troubleshooting – Section 12.1 Low Battery Voltage

Section 12.1
Low Battery Voltage

To determine if a weak battery is causing rough running or stalling, perform the following steps:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Measure the battery voltage; refer to OEM guidelines.
   1. If the battery voltage is greater than or equal to 10.5 volts, check for aerated fuel; refer to "12.2 Aerated Fuel" .
   2. If the battery voltage is less than 10.5 volts, replace the battery; refer to "12.1.1 Battery Replacement" .

Section 12.1.1
Battery Replacement

Perform the following steps for battery replacement:‪

1. Remove and replace the battery; refer to OEM guidelines.
2. Verify battery replacement; refer to "12.1.1.1 Test Engine with Replaced Battery" .

Section 12.1.1.1
Test Engine with Replaced Battery

Perform the following steps to determine if the battery replacement resolved the concern:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Run the engine at idle with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range, 88-96°C (190-205°F).
   1. If the engine is not running rough or stalling, no further troubleshooting is required. Shut down the engine.
   2. If the engine is running rough or stalling, shut down the engine. Check for aerated fuel; refer to "12.2 Aerated Fuel" .