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Home >> Volvo >> 1998 >> S90 L6-2.9L VIN 96 B6304S >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> AT / DTC Codes (Transmission Control Module) >> AT-122 Shift Solenoid S1 >> Fault In Solenoid Circuit

Fault In Solenoid Circuit





Checking Component
- Ignition ON.
- Move gear selector to position P.
- Activate solenoid S1. Read off the solenoid status. The status should alternate between OFF/ON.
- Does the status alternate between OFF/ON?

Yes:
- Proceed to: Intermittent Fault section below.

No:
- Proceed to: Checking Power Ground section below.





Checking Power Ground
- Ignition OFF.
- Connect the test box and check ground terminals.
- Check the power ground carefully.
- The ohmmeter should read approx. 0 Ohms if the power ground is OK.

If reading is OK:
- Proceed to: Checking Resistance In Solenoid S1 Circuit section below.

If reading is incorrect:
- Proceed to: Fault-tracing Information section below.

Fault-tracing Information
- The diagnostic trouble code (DTC) has been caused by a poor power ground.
- Proceed to: Verification section below.





Checking Resistance In Solenoid S1 Circuit
- Ignition OFF.
- Transmission control module (TCM) disconnected.
- Connect an ohmmeter between # 17 and # 1 on test box.
- The ohmmeter should read 12 - 18 Ohms.

If reading is OK:
- Proceed to: Checking Signal Cable For Short-circuit To Supply Voltage section below.

If reading is incorrect:
- Proceed to: Checking Signal Cable section below.





Checking Signal Cable
- Ignition OFF.
- Raise the car to access the transmission.
- Carefully clean round connector D.
- Disconnect transmission connector D.
- Connect an ohmmeter between transmission connector D terminal 1 (transmission control module side) and # 17 on the test box.
- The ohmmeter should read approx. 0 Ohms.

If reading is OK:
- Proceed to: Checking Solenoid S1 Circuit In Transmission section below.

If reading is incorrect:
- Proceed to: Checking For An Open-circuit section below.





Checking For An Open-circuit
- Check cable between transmission connector D terminal 1 and transmission control module # 17 for an open-circuit.
- Proceed to: Verification section below.





Checking Solenoid S1 Circuit In Transmission
- Ignition OFF.
- Transmission connector D disconnected.
- Connect an ohmmeter between transmission connector D terminal 1 (transmission side) and transmission housing.
- The ohmmeter should read 12 - 18 Ohms.

If reading is OK:
- Proceed to: Checking For Loose Connections And Contact Resistance section below.

If reading is incorrect:
- Proceed to: Checking Resistance In Solenoid S1 Circuit section below.





Checking For Loose Connections And Contact Resistance
- Ignition OFF.
- The diagnostic trouble code was caused by loose connections in the transmission connector. Check the transmission and transmission control module connectors for loose connections, contact resistance and oxidation.
- Proceed to: Verification section below.





Checking Resistance In Solenoid S1 Circuit
- Open the control system.
- Disconnect solenoid S1.
- Connect an ohmmeter between the pin on solenoid S1 and the transmission housing.
- The ohmmeter should read 12 - 18 Ohms.

If reading is OK:
- Proceed to: Checking For An Open-circuit section below.

If reading is incorrect:
- Proceed to: Replacing Component section below.





Checking For An Open-circuit
- Check cable between solenoid S1 and transmission connector D terminal 1 (transmission side) for an open-circuit.
- Proceed to: Verification section below.





Replacing Component
- Ignition OFF.
- Try a new solenoid S1.
- Proceed to: Verification section below.





Checking Signal Cable For Short-circuit To Supply Voltage
- Ignition OFF.
- Transmission control module disconnected.
- Ignition ON.
- Connect a voltmeter between # 17 and # 1 on the test box.
- The voltmeter should read approx. 0 Volts.

If reading is OK:
- Proceed to: Checking Voltage Drop Over Signal Ground And Power Ground section below.

If reading is incorrect:
- Proceed to: Checking For A Short-circuit To Supply Voltage section below.





Checking For A Short-circuit To Supply Voltage
- Check cable between solenoid S1 and transmission control module # 17 for a short-circuit to supply voltage.
- Proceed to: Verification section below.





Checking Voltage Drop Over Signal Ground And Power Ground
- Ignition OFF.
- Connect transmission control module.
- Ignition ON.
- Turn ON as many power consuming items as possible.
- Connect a voltmeter between # 15 and # 1 on the test box.
- The voltmeter should read less than 0.6 Volts.

If reading is OK:
- Proceed to: Checking Transmission Control Module section below.

If reading is incorrect:
- Proceed to: Checking For Open-circuit, Contact Resistance And Oxidation section below.





Checking For Open-circuit, Contact Resistance And Oxidation
- Ignition OFF.
- Check ground terminals 31/53 and 31/66, cables between ground terminals and transmission control module # 15 and # 1 and transmission control module connector for an open-circuit, contact resistance and oxidation.
- Proceed to: Verification section below.





Checking Transmission Control Module
- Ignition OFF.
- Disconnect test box.
- Connect transmission control module.
- Ignition ON.
- Erase diagnostic trouble code.
- Gear selector in position P.
- Start the engine.
- Wait for about 15 seconds.
- Test drive car at a speed above 25 km/h (16 mph).
- Check to see it the diagnostic trouble code recurs.
- Proceed to: Checking Transmission Control Module, Continued section below.





Checking Transmission Control Module, Continued
- Ignition ON.
- Check to see it the diagnostic trouble code recurs.
- Does the diagnostic trouble code recur?

Yes:
- Proceed to: Replacing Transmission Control Module section below.

No:
- Proceed to: Checking For Contact Resistance And Oxidation section below.





Replacing Transmission Control Module
- Try a new transmission control module.
- Proceed to: Verification section below.





Checking For Contact Resistance And Oxidation
- Ignition OFF.
- The diagnostic trouble code was caused by loose connections in the transmission control module connector. Check transmission control module connector for contact resistance and oxidation and remedy.
- Proceed to: Verification section below.





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

- Ignition OFF.
- Reinstall components, reconnect connectors etc.
- Ignition ON.
- Read off solenoid S1 status. Status should alternate between OFF/ON.
- Does the status alternate between OFF/ON?

Yes:
- Fault corrected.

No:
- Proceed to: Fault Tracing Information section below.

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: Checking Component section above.





Intermittent Fault
- Check transmission and transmission control module connectors for loose connections, contact resistance and oxidation.
- Check the cable between the solenoid S1 and transmission control module # A17 for an intermittent open-circuit and an intermittent short-circuit to supply voltage.
- Check cable between ground terminal 31/66 and transmission control module # 1 for an intermittent open-circuit.
- Check ground terminal 31/66 for contact resistance and oxidation.
- Check the cable between the positive terminal on the battery and transmission control module # A29 for an intermittent open-circuit.
- Proceed to: Fault Tracing Information section below.

Fault-tracing Information
For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.

- Do you want to repeat fault-tracing?

Yes:
- Proceed to: Checking Component section above.

No:
- Operation done.
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