Signal Too High. Permanent Fault
Signal SpecificationSignal too high. Permanent fault
Checking the cables in the circuit for solenoid STH
- Ignition off
- Disconnect the transmission connector
- Disconnect the control module.
- Connect the breakout box to the transmission
- Connect adapter 951 1505 Adapter 20 pin 951 1505 Adapter 20 Pin and breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the transmission connector (control module side).
Check the cable between control module terminal #52 (#A52) and transmission connector terminal #C (#A3). Check for a short-circuit to supply voltage. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module terminal #A70 (#B10) and transmission connector terminal #D (#A4). Check for a short-circuit to supply voltage. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check the wiring between the control module and the transmission. Check for a short-circuit to supply voltage with the other cables in the wiring harness.
Other information:
- To connect the breakout box to the control module, see Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions, 4T65EV-GT Connecting the Breakout Box, GM Automatic Transmissions
- For information about signals, Signal Specification .
Was the wiring OK?
Yes - Checking the wiring and component
No - Checking the control module
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Checking the control module
Hint: The control module may be damaged if there has been a short-circuit to supply voltage in the circuit for solenoid STH. Check the control module as follows:
- Ignition off
- Start the car
- Reinstall the connectors, components etc.
- Read off the current through the solenoid circuit
- Depress the accelerator pedal (AP) slowly.
The current should decrease as the accelerator pedal (AP) is depressed.
Does the current decrease?
Yes - Verification
No - Replacing the control module and programming
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Checking the wiring and component
- Ignition off
- Open the transmission control system.
Check the cable between transmission terminal #C (#A3) and solenoid STH terminals #A and #D (#A4) and solenoid STH terminal #B. Check for a short-circuit to supply voltage. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check the wiring for a short-circuit to supply voltage with the other cables in the wiring harness.
Hint: Check solenoid STH by measuring the solenoid STH resistance between terminals #A and #B. The resistance must be between 3 and 5 ohms.
Remedy as necessary.
Other information:
- To open the transmission control system, see Side cover transmission, replacing Side Cover Transmission, Replacing
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions, 4T65EV-GT Connecting the Breakout Box, GM Automatic Transmissions
- To replace line pressure solenoid STH, see Solenoid line pressure, replacing
- To replace the cable harness, see Wiring harness / oil temperature sensor, replacing Removal and Replacement
- For information about signals, Signal Specification.
Continue - Resetting the adaptation and oil quality counter
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Replacing the control module and programming
Caution! A new control module is delivered without software. The control module must be programmed in order to function after replacement.
For further information about programming and replacing the control module, see Transmission control module (TCM), replacing, B5254T2, AW50/51 AWD, B5254T2, AW55-50/51SN Service and Repair.
Continue - Verification
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Resetting the adaptation and oil quality counter
Resetting the adaptation
Resetting adaptation and the counter for "Transmission oil change"
Hint: The transmission has torque controlled adaptive pressure control. Pressure control means that the transmission regulates the pressure itself during each gear shift. This avoids harsh gear shifting. Each gear shift is evaluated by the control module and stored in the memory. This allows for compensation for wear and tear in the transmission and clutch. It is important that the adaptation in the memory is reset after the transmission has been repaired. This is to ensure normal operation. The oil is replaced during repair; the "Transmission oil change" counter must be reset. If the counter is not reset when the fluid is drained and replaced, there is a risk that a diagnostic trouble code (DTC) will be stored in incorrect circumstances.
Note! This applies only if the transmission or one of the components in the transmission have been replaced.
- Ignition on.
Click on the VCT2000 symbol to reset the adaptation and counter.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect the connectors, reinstall components etc.
- Raise the car so that the drive wheels are unimpeded.
- Start the car.
- Read off the current through the solenoid circuit.
- Lock the wheels with the brakes. Shift the gear selector to position D.
- Depress the accelerator pedal (AP) slowly.
The current should decrease as the accelerator pedal (AP) is depressed.
Does the current decrease?
Yes - Verification completed
No - 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 the cables in the circuit for solenoid STH
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