Signal Too Low
Signal too low
Checking status
- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
Read off the diagnostic trouble code (DTC) status. If the diagnostic trouble code (DTC) status is intermittent the cause of the fault was contact resistance or oxidation.
Other information:
- To disconnect control module, see Replacing the gearbox control module (TCM) .
Is the diagnostic trouble code (DTC) status intermittent?
Yes - Checking power supply
No - Checking battery voltage
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Checking battery voltage
- Start the engine and let it idle.
- Connect a voltmeter between the battery positive and negative terminals.
The voltmeter should read 12-15 V. If the voltage is lower, check charging system for low charge voltage.
Was a fault detected?
Yes - Verification
No - Fault-tracing information
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Checking power supply
- Ignition off.
Check control module connector for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check the power supply cable between fuse 2 the integrated relay/fusebox in the engine compartment and #35 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Hint: With the ignition on and the voltmeter connected between #35 and #53 on the breakout box the voltmeter should read battery voltage.
Other information:
- To connect the breakout box, see Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM).
- To disconnect control module, see Replacing the gearbox control module (TCM) .
- For information about signals, see Signal specification, Transmission control module (TCM) Signal Description AW50-42.
Continue - Diagnostic trouble code (DTC) information
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Verification
Verification
- Ignition on.
Read off the voltage to the transmission control module (TCM). Voltage should be battery voltage.
Was 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 - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking status
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Diagnostic trouble code (DTC) information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking status
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Fault-tracing information
Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking status
FAULT-TRACING FAILED - No Fault Found
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