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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-322 Incorrect Gear Ratio >> Incorrect Gear Ratio

Incorrect Gear Ratio





Checking Transmission Oil Level
- Ignition ON.
- Go into scrolling values.
- Read off oil temperature.
- Check transmission oil level. Check level at different temperatures.
- Is level OK?

Yes:
- Proceed to: Checking For Mechanical Faults In The Transmission section below.

No:
- Proceed to: Checking For Oil Leakage section below.

Checking For Oil Leakage
- Check for oil leaks. Remedy as necessary.
- Top up oil to correct level.

NOTE: Driving the car with low oil level may have damaged the transmission. Test drive car to ensure that the transmission is OK.

- Proceed to: Test Driving section below.





Checking For Mechanical Faults In The Transmission
- Ignition ON.
- Note diagnostic trouble code (DTC) frozen values.
- Erase diagnostic trouble code.
- Test drive car according to Test Drive Form. Repeat the driving conditions in force when the diagnostic trouble code was stored. Watch the automatic transmission warning light. If the warning lamp starts flashing a diagnostic trouble code has been stored. Make an immediate note of abnormalities in the operation of the transmission before and after the warning lamp started flashing.

NOTE: When diagnostic trouble codes AT-321, AT-322, or AT-323 are stored, the transmission control module (TCM) activates the emergency "Limp Home program. The transmission will not then operate normally.

- Is the transmission exhibiting any mechanical malfunctions or making noises?

No:
- Proceed to: Connecting The Test Box section below.

Yes:
- Proceed to: Fault-tracing Information section below.

Fault-tracing Information
- See Table of symptoms for symptoms and corrective action.
- Proceed to: Verification section below.





Connecting The Test Box
- Ignition OFF.
- Connect the test box and check ground terminals.
- Proceed to: Checking Transmission Speed Sensor Signal Cable (-) section below.





Checking Transmission Speed Sensor Signal Cable (-)
- Ignition OFF.
- Engine control module (ECM) disconnected.
- Connect an ohmmeter between # 22 and # 15 on test box.
- The ohmmeter should read infinite resistance.

If reading is OK:
- Proceed to: Checking Signal From Transmission Speed Sensor section below.

If reading is incorrect:
- Proceed to: Checking Transmission Speed Sensor section below.





Checking Transmission Speed Sensor
- Ignition OFF.
- Raise the car to access the transmission.
- Carefully clean round connector B.
- Disconnect transmission connector B.
- Connect an ohmmeter between transmission connector B, connector 2 (transmission speed sensor side) and ground.
- The ohmmeter should read infinite resistance.

If reading is OK:
- Proceed to: Checking For A Short-circuit section below.

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





Checking For A Short-circuit
- Check cable between transmission connector B terminal 2 and transmission control module # 22 for a short-circuit to ground.
- Proceed to: Verification section below.





Replacing Component
- Ignition OFF.
- Try a new transmission speed sensor.
- Proceed to: Verification section below.





Checking Signal From Transmission Speed Sensor
- Ignition OFF.
- Connect transmission control module.
- Connect a frequency meter between # 22 and # 37 on the test box.
- Raise car so that rear wheels can rotate freely.
- Engine idling.
- A/C turned OFF.
- Move the gear selector to position D so the rear wheels begin to rotate.
- Increase the engine rpm to approx. 2,000 rpm.
- Maintain a constant engine speed (RPM).

NOTE: When the front wheels are stationary and the rear wheels rotate diagnostic trouble codes may can be stored in the ABS system. Erase any diagnostic trouble codes stored in the ABS system after fault-tracing.

- The frequency meter should give a stable reading (Hz) when the engine speed is constant and the transmission is not shifting.

NOTE: Ensure that the rear wheels are not rotating when the gear shift lever is moved.

- Is the frequency stable?

Yes:
- Proceed to: Checking Vehicle Speed Signal section below.

No:
- Proceed to: Checking Transmission Speed Sensor Resistance section below.





Checking Transmission Speed Sensor Resistance
- Ignition OFF.
- Disconnect engine control module.
- Connect an ohmmeter between # 22 and # 37 on test box.
- The ohmmeter should read 300-600 Ohms.

If reading is OK:
- Proceed to: Checking For Sources Of Interference section below.

If reading is incorrect:
- Proceed to: Checking The Transmission Connector section below.

Checking For Sources Of Interference
- Check that the transmission speed sensor wiring is not too near sources of interference, such as electric motors, ignition cables, mobile telephone cables etc.
- Proceed to: Test Driving section below.





Checking The Transmission Connector
- Ignition OFF.
- Engine control module disconnected.
- Disconnect the transmission connector.
- Check transmission connector B for contact resistance and oxidation and remedy.
- Connect transmission connector.
- Connect an ohmmeter between # 22 and # 37 on test box.
- The ohmmeter should read 300-600 Ohms.

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

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

Fault-tracing Information
- The diagnostic trouble code was caused by loose connections in the transmission connector.
- Proceed to: Verification section below.





Replacing Component
- Ignition OFF.
- Try a new transmission speed sensor.
- Proceed to: Verification section below.





Checking Vehicle Speed Signal
- Ignition OFF.
- Engine control module connected.
- Raise car so that rear wheels can rotate freely.
- Connect a frequency meter between # 8 and # 15 on the test box.
- Engine idling.
- Move the gear selector to position D so the rear wheels start to rotate.
- Increase the engine speed to approx. 2,000 rpm. Maintain a constant engine speed of 2,000 rpm.

NOTE: When the front wheels are stationary and the rear wheels rotate diagnostic trouble codes may can be stored in the ABS system. Erase any diagnostic trouble codes stored in the ABS system after fault-tracing.

- The multimeter should give a stable reading (Hz) when the speed is constant.

NOTE: Ensure that the rear wheels are not rotating when the gear shift lever is moved.

- Is the frequency stable?

Yes:
- Proceed to: Checking Resistance In Solenoid S1 And S2 Circuits section below.

No:
- Proceed to: Checking Circuits section below.





Checking Circuits
- Check speedometer vehicle speed sensor (VSS) circuit for an intermittent open-circuit, intermittent short-circuit to ground and an intermittent short-circuit to supply voltage.
- Check cable between speedometer terminal C:12 control module transmission control module # 8 for an intermittent open-circuit, intermittent short-circuit to ground and an intermittent short-circuit to supply voltage.
- Check cable between speedometer terminal C:12 and transmission control module # 8 for interference from electric motor, ignition cables, mobile telephones etc.
- Proceed to: Verification section below.





Checking Resistance In Solenoid S1 And S2 Circuits
- Ignition OFF.
- Disconnect transmission control module.
- Connect an ohmmeter between the test box terminals:

- # 17 and # 1, solenoid S1.
- # 31 and # 1, solenoid S2.

- The ohmmeter should read 12-18 Ohms.

If reading is OK:
- Proceed to: Checking Gear-shift Position Sensor section below.

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





Checking For Contact Resistance And Oxidation
- Ignition OFF.
- Check transmission connector for contact resistance and oxidation.
- Proceed to: Test Driving section below.





Checking Gear-shift Position Sensor
- Ignition OFF.
- Check gear-shift position sensor adjustment.
- Is adjustment OK?

Yes:
- Proceed to: Checking The Transmission Control Module section below.

No:
- Proceed to: Adjusting Gear-shift Position Sensor section below.





Checking The Transmission Control Module
- Ignition OFF.
- Reconnect connectors, reinstall components etc.
- Ignition ON.
- Erase diagnostic trouble codes.
- Stop car.
- Check to see if the diagnostic trouble code has been stored again.
- Has the diagnostic trouble code been stored again?

Yes:
- Proceed to: Replacing Component section below.

No:
- Proceed to: Test Driving section below.





Replacing Component
- Ignition OFF.
- Try a new transmission control module.
- Proceed to: Test Driving section below.





Adjusting Gear-shift Position Sensor
- Ignition OFF.
- Adjust gear-shift position sensor.
- Proceed to: Test Driving section below.





Checking Component
- Ignition OFF.
- Reconnect connectors, reinstall components etc.
- Ignition ON.
- Erase diagnostic trouble codes Test drive the car. During the test drive the oil temperature should be over +20°C (68°F) and the throttle opening should be more than 5%.
- Gear selector in position 3, speed approx. 60 km/h (37 mph). Move gear selector to position L so that 2nd gear is engaged. Accelerate evenly (engine speed over 1,400 rpm).
- Stop car.
- Check to see if the diagnostic trouble code has been stored again.

NOTE: If the diagnostic trouble code recurs the old transmission control module is OK. Reinstall the old transmission control module.

- Has the diagnostic trouble code recurred?

Yes:
- Proceed to: Replacing Component section below.

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

Fault-tracing Information
- Old control module was defective.
- Fault corrected.





Test Driving
- Ignition ON.
- Erase diagnostic trouble codes.
- Test drive car according to Test Drive Form. Repeat the driving conditions in force when the diagnostic trouble code was stored. Watch the automatic transmission warning light. If the warning lamp starts flashing a diagnostic trouble code has been stored. Make an immediate note of abnormalities in the operation of the transmission before and after the warning lamp started flashing.

NOTE: When diagnostic trouble codes AT-321, AT-322, or AT-323 are stored the transmission control module activates the emergency "Limp Home" program. The transmission will not then operate normally.

- Is the transmission exhibiting any obvious mechanical faults or making any noises?

Yes:
- Proceed to: Replacing Component section below.

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





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





Fault-tracing Information
- Transmission is OK.
- Fault corrected.

Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition OFF.
- Reconnect connectors, reinstall components etc.
- Ignition ON.
- Erase diagnostic trouble codes.

- Test drive the car. During the test drive the oil temperature should be over +20°C (68°F) and the throttle opening should be more than 5%.
- Gear selector in position 3, speed approx. 60 km/h (37 mph). Move gear selector to position L so that 2nd gear is engaged. Accelerate evenly (engine speed over 1,400 rpm).
- Stop car.

NOTE: When diagnostic trouble codes AT-321, AT-322, or AT-323 are stored the transmission control module activates the emergency "Limp Home" program. The transmission will not then operate normally.

- The diagnostic trouble code does not recur and the transmission is not exhibiting operating faults?

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 Transmission Oil Level section above.
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