Signal Too Low
Signal too low
Checking the cable between the battery and generator (GEN)
- Check that the battery is charged
- Charge the battery if necessary.
Check the cable between generator (GEN) terminal #A1 and starter motor terminal #2. Check for an open-circuit. Check for a short-circuit to ground.
Check the cable between the battery positive terminal and starter motor terminal #1. Check for an open-circuit. Check for a short-circuit to ground.
Remedy as necessary.
Other information
- Location of components Locations
- Checking wiring and terminals Checking Wiring And Terminals
Was a fault detected?
Yes - Verification
No - Checking the power supply
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Checking the power supply
- Ignition off
- Disconnect central electronic module (CEM) connector E.
Check central electronic module (CEM) connector E. Check for contact resistance and oxidation. Check for damage carefully.
Check the power supply to central electronic module (CEM) terminals #EA and #EB from the rear electronic module (REM). Also check the intermediate fuses. The voltage must be at least battery voltage minus 3 V.
Note! Also check the power supply from the battery to rear electronic module (REM) terminal #K1. Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. Check the fuse.
Remedy as necessary.
Other information
- For further information about the fuses and relays, see the Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Pinout Values and Diagnostic Parameters
- Location of components Locations
- Checking wiring and terminals Checking Wiring And Terminals
Was a fault detected?
Yes - Verification
No - Checking the ground terminal
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Checking the ground terminal
- Ignition off
- Disconnect central electronic module (CEM) connector D.
Check central electronic module (CEM) connector D. Check for contact resistance and oxidation. Check for damage carefully.
Check the ground lead between central electronic module (CEM) terminal #D6 (#6) and the ground terminal. Check for an open-circuit. Check for loose connections. Check for contact resistance and oxidation. With the ignition on, the drop in voltage between the ground connection for the central electronic module (CEM) and the ground terminal must not be greater than 0.5 V.
Remedy as necessary.
Other information
- For further information about the fuses and relays, see the Wiring Diagram
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Pinout Values and Diagnostic Parameters
- Location of components Locations
- Checking wiring and terminals Checking Wiring And Terminals
Was a fault detected?
Yes - Verification
No - Checking the battery
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Checking the battery
Check the condition of the battery.
Is the battery OK?
Yes - Checking the generator (GEN)
No - Replacing battery
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Replacing battery
Replace the battery.
Other information
- Battery, disconnecting Battery Disconnecting
Continue - Verification
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Checking the generator (GEN)
Check that the generator (GEN) is working correctly.
Remedy as necessary.
Other information
- Replace the generator (GEN) for gasoline engines, see: Generator, replacement Service and Repair
- Replace the generator (GEN) for diesel engines, see: Generator (GEN), replacing Service and Repair
Continue - Verification
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Start the engine. Allow the engine to idle for at least 5 minutes.
Check the power supply to the central electronic module (CEM). The voltage must be at least battery voltage minus 3 V.
Is the voltage OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking the cable between the battery and generator (GEN)
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