Fault-Tracing
Fault tracing
Checking the power supply
- Ignition on
- Read off the power supply for the transmission control module (TCM).
The voltage must be about the same as the battery voltage.
- Start the engine and allow it to idle.
- Read off the power supply for the transmission control module (TCM) again.
The voltage should rise to 13-15 V, depending on the alternator charging voltage.
Select an alternative:
1. Normal voltage.
2. Voltage too low.
3. Voltage too high.
1 - Checking the components and wiring
2 - Checking the battery voltage
3 - Checking the power supply
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Checking the battery voltage
- Start the engine and allow it to idle.
- Expose the battery.
- Connect a voltmeter between the positive and negative battery terminals.
The voltmeter should read 13-15V depending on the alternator charging voltage.
Is the voltage OK?
Yes - Checking wiring and terminals
No - Checking the power supply
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Checking wiring and terminals
Check the connector A one the transmission control module (TCM) with regard to contact resistance and oxidation.
Check the power supply lead (30 supply) between the fuse in the main relay and fuse box in the engine compartment and the transmission control module (TCM) #A1 (#31) with regard to an open circuit. For information on wiring, see the associated wiring diagram.
Check the power supply lead (15 supply) between the fuse in the main relay and fuse box in the cabin and transmission control module (TCM) #A11 (#41) with regard to intermittent open circuits. For information on wiring, see the associated wiring diagram.
Hint: When the ignition is on, the voltmeter should show battery voltage on both connections when measuring to chassis ground.
Check the ground lead between the chassis ground point and transmission control module (TCM) #A9 (#39) with regard to open circuits. For information on wiring, see the associated wiring diagram.
Hint: When the ignition is on, the voltmeter should show battery voltage between #A9 (#39) and the positive battery terminal.
Note! If a fault was not found, check for faults in the central electronic module (CEM).
Remedy as necessary.
Other information:
- Connecting the breakout box Connecting Breakout Box, Transmission Control Module (TCM)
- Signal description Signal Description. Transmission Control Module (TCM)
- To access connector A, see: Transmission control module (TCM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Verification
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Checking the power supply
Check the vehicle's charging system with regard to the charging.
Remedy as necessary.
Continue - Verification
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Checking the power supply
Make sure a battery charger with a charging voltage that is too high is not connected.
Check the vehicle's charging system with regard to high charging voltage.
Remedy as necessary.
Continue - Verification
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Checking the components and wiring
Fault tracing indicates that the transmission control module (TCM) has previously registered a fault but the fault is no longer active.
Check the connector A one the transmission control module (TCM) with regard to contact resistance and oxidation.
Check the power supply lead (30 supply) between the fuse in the main relay and fuse box in the engine compartment and transmission control module (TCM) #A1 (#31) with regard to an intermittent open circuit. For information on wiring, see the associated wiring diagram.
Check the power supply lead (15 supply) between the transmission control module (TCM) and the ignition switch (via the central electronic module (CEM)). For information on wiring, see the associated wiring diagram.
Hint: When the ignition is on, the voltmeter should show battery voltage on both connections when measuring to chassis ground.
Check the ground lead between the chassis ground point and transmission control module (TCM) #A9 (#39) with regard to an intermittent open circuit. For information on wiring, see the associated wiring diagram.
Hint: The diagnostic trouble code (DTC) may have been stored due to a battery charger with a charging voltage that is too high having earlier been connected.
Remedy as necessary.
Other information:
- Connecting the breakout box Connecting Breakout Box, Transmission Control Module (TCM)
- Signal description Signal Description. Transmission Control Module (TCM)
- To access connector A, see: Transmission control module (TCM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Diagnostic trouble code (DTC) information
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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.
- Ignition on
- Read off the power supply for the transmission control module (TCM).
The voltage must be about the same as the battery voltage.
- Start the engine and allow it to idle.
- Read off the power supply for the transmission control module (TCM) again.
The voltage should rise to 13-15 V, depending on the alternator charging voltage.
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 power supply
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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 the power supply
FAULT FOUND - Fault Found
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