Short Circuit In STH Amplifier

SPECIAL TOOLS
Test box tool No. 981 3190, or equivalent
Volvo scan tool No. 998 8686, or equivalent

SHORT-CIRCUIT IN STH AMPLIFIER CIRCUIT
1. Checking solenoid STH
- Preparation:
Ignition ON.
Select scrolling values.
Read off current in solenoid circuit.
Depress accelerator pedal (AP) slowly.
- The current should decrease as the accelerator pedal is depressed.
- If reading is OK:
Proceed to step3
- If reading is incorrect:
Proceed to step2





2. Replacing component
- Preparation:
Ignition OFF
- Try a new Transmission Control Module (TCM), refer to replacement. Service and Repair
- Then continue with step 4
3. Erase diagnostic trouble code (DTC)
- Preparation:
Ignition ON.
- The control module previously posted a fault.
- Erase DTC.
Then continue with step 4





4. Verification

NOTE: After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:

- Preparation:
Ignition ON.
Select scrolling values.
Read off current in solenoid circuit.
Depress accelerator pedal slowly.
- The current should decrease as the accelerator pedal is depressed.
- If reading is OK:
Fault corrected
- If reading is incorrect:
Proceed to step 5
5. Fault-tracing information
- The verification result shows that the fault persists.
- Do you want to exit fault-tracing?
YES: Fault not corrected
NO: Proceed to step