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Home >> Volvo >> 1998 >> S70 GL L5-2.4L VIN 55 B5254S >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> AT / DTC Codes (Transmission Control Module) >> AT-313 Gear-Shift Position Sensor >> Faulty Signal

Faulty Signal






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

FAULTY SIGNAL
1. Checking gear-shift position sensor
- Preparation:
Ignition ON
Select scrolling value.
Read gear-shift position sensor position.
- Move the gear selector to all shift positions a number of times, and repeatedly select the same position to check the operation of the gear-shift position sensor.
- Are all values OK?
YES: Proceed to step 19
NO: Proceed to step 2





2. Checking gear-shift position sensor adjustment
- Preparation:
Ignition OFF
- Check gear position sensor adjustment, refer to Transmission Position Switch/Sensor found under Powertrain Management.
- Is the gear-shift position sensor correctly adjusted?
YES: Proceed to step 4
NO: Proceed to step 3
3. Adjusting component
- Adjust gear-shift position sensor according to Transmission Position Switch/Sensor found under Powertrain Management.
- Then continue with step 17





4. Checking gear-shift position sensor ground terminal

NOTE: The gear-shift position sensor is grounded via its two retaining screws and its mating surface with the transmission.

- Preparation:
Ignition OFF
- Connect an ohmmeter between gear-shift position sensor casing and transmission housing.
- The ohmmeter should read approx. 0 Ohms
- If reading is OK:
Proceed to step 6
- If reading is incorrect:
Proceed to step 5





5. Remedying gear-shift position sensor ground terminal
- Remedy gear-shift position sensor ground terminal.
- Check gear-shift position sensor adjustment after corrective action according to Transmission Position Switch/Sensor found under Powertrain Management.
- Then continue with step 17





6. Connecting the test box
- Preparation:
Ignition OFF
Connect the test box and check ground terminals. Connecting the Test Box
- Then continue with step 7





7. Checking signal cable resistance to ground
- Preparation:
Ignition OFF
Disconnect the transmission connector.
Test box connected
Transmission Control Module (TCM) disconnected
- Connect ohmmeter between test box #20 (#A20) and terminal:
#3 (#A3) "A"
#4 (#A4) "B"
#5 (#A5) "C"
#6 (#As) "PA"
- The ohmmeter should read infinite resistance.
- If reading is OK:
Proceed to step9
- If reading is incorrect:
Proceed to step8





8. Checking for short-circuit to ground
- Check cable between transmission connector (TCM side) terminal:
1 and TCM #3 "A"
2 and TCM #4 "B"
3 and TCM #5 "C"
4 and TCM #6 "PA" for a short-circuit to ground according to step 3 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 17





9. Checking signal cable resistance
- Preparation:
Ignition OFF
Disconnect transmission connector
- Connect an ohmmeter between transmission connector (TCM side) terminal:
1 and test box #3 (#As) "A"
2 and test box #4 (#A4) "B"
3 and test box #5 (#A5) "C"
4 and test box #6 (#A6) "PA"
- The ohmmeter should read approx. 0 Ohms for all readings.
- If reading is OK:
Proceed to step 11
- If reading is incorrect:
Proceed to step 10





10. Checking for an open-circuit
- Check cable between transmission connector terminal:
1 and TCM #3 "A"
2 and TCM #4 "B"
3 and TCM #5 "C"
4 and TCM #6 "PA"
- Check for open-circuits according to step 2 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 17





11. Checking for short-circuit to supply voltage in signal cable
- Preparation:
Ignition OFF
Connect TCM
Ignition ON
- Connect an test light (bulb at least 3 watt) between test box #A20 (#A20) and:
#3 (#A3) "A"
#4 (#A4) "B"
#5 (#As) "C"
#6 (#A6) "PA"
- Did the bulb light?
YES: Proceed to step 12
NO: Proceed to step 13





12. Checking for short-circuit to supply voltage
- Check cable between transmission connector terminal:
1 and TCM #3 "A"
2 and TCM #4 "B"
3 and TCM #5 "C"
4 and TCM #6 "PA"
- Check for a short-circuit to supply voltage according to BBA4.
- Then continue with step 16





13. Checking gear-shift position sensor operation
- Preparation:
Ignition OFF
Connect transmission connector.
Connect TCM
Ignition ON
Go into scrolling values.
Read gear-shift position sensor position.
Move the gear-shift position sensor to all shift positions a number of times, and repeatedly select the same position to check the operation of the gear-shift position sensor.
- Are all values OK?
- If reading is OK:
Proceed to step 14
- If reading is incorrect:
Proceed to step 15





14. Remedy contact resistance and oxidation
- Preparation:
Ignition OF
- The Diagnostic Trouble Code (DTC) was caused by poor contact in the TCM and transmission connectors
- Check connectors for contact resistance and oxidation and remedy according to step 5 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 17





15. Replacing component
- Try a new gear-shift position sensor, refer to Transmission Position Switch/Sensor found under Powertrain Management.
- Then continue with step 17





16. Checking gear-shift position sensor

NOTE: The gear-shift position sensor can break if the signal cable has been short-circuited to supply voltage

- Check the gear position sensor as follows.
- Preparation:
Ignition OFF
Connect transmission connector.
TCM connected.
- Ignition ON
- Select scrolling values.
- Read gear-shift position sensor position.
- Move the gear selector to all shift positions a number of times, and repeatedly select the same position to check the operation of the gear-shift position sensor.
- Are all values OK?
YES: Fault corrected
NO: Proceed to step 15





17. Verification
- After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:
Ignition OFF
Reinstall components, components etc.
Ignition ON
Select scrolling values.
Read gear-shift position sensor position.
Move the gear selector to all shift positions a number of times, and repeatedly select the same position to check the operation of the gear selector.
- Are all values OK?
YES: Fault corrected
NO: Proceed to step 18
18. 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 1





19. Intermittent fault
- Preparation:
Ignition OFF
- Check that the gear-shift position sensor is securely attached.
- Check control module and transmission connectors and gear-shift position sensor ground terminal for:
Loose connections according to step 5 of checking for intermittent faults. Checking For Intermittent Faults
Contact resistance and oxidation according to step 6 of checking for intermittent faults. Checking For Intermittent Faults
- Check the cables between the gear-shift position sensor and TCM for:
An intermittent open-circuit according to step 2 of checking for intermittent faults. Checking For Intermittent Faults
An intermittent short-circuit to ground according to step 3 of checking for intermittent faults. Checking For Intermittent Faults
An intermittent short-circuit to supply voltage according to step 4 of checking for intermittent faults. Checking For Intermittent Faults
- Then continue with step 20
20. 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 step 1
NO: Operation done

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