Diagnostic trouble code (DTC) information
Condition
Shift solenoids S2 and S1 operate in tandem to control gear-shifting. The solenoids are controlled by amplifiers in the transmission control module (TCM). The transmission control module (TCM) opens the amplifiers to activate the solenoids and sends a voltage through the circuit. Solenoid S1 is activated in 2nd and 3rd gears. Diagnostic trouble code (DTC) TCM-0001 is stored if the control module registers that the signal is too high in the circuit for solenoid S1 when the solenoid should not be activated.
Substitute Value
- The control module "Limp Home" program has been initiated.
Possible Source
- Short-circuit to supply voltage in the signal cable.
Fault symptom[s]
- General orange warning lamp lit.
- Malfunction indicator lamp (MIL) lit.
- Harsh gear shifting.
- No shifting.
- No lock-up function.
HINT: Harsh shifting - due to disabled line pressure solenoid STH control. This results in constant maximum line pressure and leads to harsher shifting and gear engagement.
HINT: No shifting - because the transmission control module (TCM) prevents activation of the solenoids. This prevents gear-shifting. The transmission only operates in 3rd gear in positions 1 and 2, 4th gear in positions D and 3, and reverse gear in position R. Shifting can only be carried out manually between 3rd, 4th and reverse gears. If there is a short-circuit to supply voltage in the solenoid circuit the transmission will probably only operate in 3rd gear.