Signal Too Low. Permanent Fault
Signal too low. Permanent fault
Checking the cable between the battery and the generator (GEN)
Check that the battery is charged.
Charge the battery if necessary.
Check the cable between generator (GEN) terminal #1A and starter motor terminal #1 (the red / green flat pin cable). Check for an open-circuit. Check for a short-circuit to ground. Also check the cable between starter motor terminal #1 and the battery positive terminal in the same way.
Other information:
- 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
Check the voltage to ground at the following points:
- main fuse 11A/2
- fuse 11C/32.
The voltage must be at least battery voltage minus three volts.
Check for contact resistance and oxidation at the fuses.
Remedy as necessary.
Other information
- For further information about the fuses and relays, see the Wiring Diagram.
Was a fault detected?
Yes - Verification
No - Checking the power supply and ground terminals
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Checking the power supply and ground terminals
Check connector 54/3. Check for contact resistance and oxidation. Check for damage carefully.
Check the voltage to ground at control module connector terminal #6E. The voltage must be at least battery voltage minus three volts.
Check the central electronic module (CEM) connector. Check for contact resistance and oxidation. Check for damage carefully.
Check the wiring between control module terminal #1E and ground: left A-post (right A-post for right-hand drive cars) for loose connections.
Other information
- To access connector 54/3, see applicable wiring diagram. (Also see the illustration)
- To access the central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- 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 - Battery
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Battery
Replace the battery.
Other information
- When replacing the battery, see Battery, disconnecting Battery Disconnecting.
Continue - Verification
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Checking the generator (GEN)
Check that the generator (GEN) is working correctly.
Try a new generator (GEN).
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 the repair it is necessary to check that the fault has been rectified.
- Ignition off.
- Connect connectors, install components, etc.
- Charge the battery.
- Start the vehicle and let it remain idle for at least 5 minutes.
Read the power supply to the central electronic module (CEM). Voltage should be at least battery voltage minus three volts.
Is 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 - No Fault Found
Attempt New Test - Checking the cable between the battery and the generator (GEN)
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