Operation CHARM: Car repair manuals for everyone.
Home >> Volvo >> 1998 >> V70 AWD L5-2.4L Turbo VIN 56 B5254T >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> AT / DTC Codes (Transmission Control Module) >> AT-142 Oil Temperature Sensor >> Signal Too High

Signal Too High






SPECIAL TOOLS
Volvo scan tool No. 998 8686, or equivalent

SIGNAL TOO HIGH
1. Checking oil temperature
- Preparation:
Ignition ON
Go into scrolling values.
Read off oil temperature.
- Check that the transmission oil temperature is within bounds.
- Compare with the transmission temperature.
- Is the oil temperature within bounds?
YES: Proceed to step 17
NO: Proceed to step 2





2. Checking ground lead
- Preparation:
Ignition OFF
Remove the Air Cleaner (ACL) housing to access the transmission connector.
Disconnect the transmission connector.
- Connect an ohmmeter between the transmission connector terminal 13 Transmission Control Module (TCM) side and ground.
- The ohmmeter should read approx. 0 Ohms
- If reading is OK:
Proceed to step 6
- If reading is incorrect:
Proceed to step 3





3. Checking the TCM connector
- Preparation:
Ignition OFF
Disconnect transmission connector.
Check TCM connector for contact resistance and oxidation and remedy according to step 5 of checking for permanent faults. Checking For Permanent Faults
Control module connected.
- Connect an ohmmeter between the transmission connector terminal 13 TCM side and ground.
- The ohmmeter should read approx. 0 Ohms
- If reading is OK:
Proceed to step 4
- If reading is incorrect:
Proceed to step 5
4. Fault-tracing information
- The Diagnostic Trouble Code (DTC) was caused by poor contact in the TCM connector.
- Then continue with step 15





5. Checking for an open-circuit
- Check cable between transmission connector terminal 13 and TCM #A15 for an open-circuit according to step 2 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 15





6. Checking signal cable
- Preparation:
Ignition OFF
Disconnect transmission connector.
- Ignition ON

NOTE: Diagnostic trouble codes (DTCs) for solenoids and the gear-shift position sensor may be stored if the transmission connector is disconnected and the ignition switched on.

- Connect a voltmeter between the transmission connector terminal 12 TCM side and ground.
- The voltmeter should read approx. 5 volts
- If reading is OK:
Proceed to step 10
- If value is lower:
Proceed to step 8
- If value is higher:
Proceed to step 7





7. Checking for short-circuit to supply voltage
- Check cable between transmission connector terminal 12 and control module #A14 for a short-circuit to supply voltage according to step 4 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 13





8. Checking the TCM connector
- Preparation:
Ignition OFF
Disconnect transmission connector.
Check TCM connector for contact resistance and oxidation and remedy according to step () of checking for permanent faults. Checking For Permanent Faults
Control module connected.
Ignition ON Connect a voltmeter between the transmission connector terminal 12 TCM side and ground.
- The voltmeter should read approx. 5 volts
- If reading is OK:
Proceed to step 4
- If reading is incorrect:
Proceed to step 9





9. Checking for an open-circuit
- Check cable between transmission connector terminal 12 and transmission control module (TCM) #A14 for an open-circuit according to step 2 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 15





Checking oil temperature sensor resistance
- Preparation:
Ignition OFF
Disconnect transmission connector.
- Connect an ohmmeter between the transmission connector terminals 12 and 13 (transmission side).
- Compare the temperature below with the transmission temperature at the oil temperature sensor.

Specification Table
Temperature: O°C
Resistance (Ohms): 1700-2300
Temperature: 20°C
Resistance (Ohms): 765-1035
Temperature: 40°C
Resistance (Ohms): 340-460
Temperature: 80°C
Resistance (Ohms): 107-143
Temperature: 100°C
Resistance (Ohms): 64-86
Temperature: 150°C
Resistance (Ohms): 23-31

- Does the ohmmeter read approx. 765-1035 Ohms at +20°C (see table)?
YES: Proceed to step 11
NO: Proceed to step 12





11. Remedy contact resistance and oxidation
- The DTC has been caused by poor contact in the transmission and TCM connectors.
- Check connector for contact resistance and oxidation and remedy according to step 5 of checking for permanent faults. Checking For Permanent Faults
- Then continue with step 15





12. Checking for an open-circuit
- Check cables between the oil temperature sensor and transmission connector terminals 12 and 13 for an open-circuit according to step 2 of checking for permanent faults. Checking For Permanent Faults
- Are cables OK?
YES: Proceed to step 14
NO: Proceed to step 15






13. Checking oil temperature sensor

NOTE: The oil temperature sensor can malfunction due to a short-circuit to supply voltage in the signal cable.

- Check signal cable as follows:
- Preparation:
Ignition OFF
Disconnect transmission connector
- Connect an ohmmeter between the transmission connector terminals 12 and 13 (transmission side).
- The ohmmeter should read 765-1035 Ohms at +20°C, (see table).
- If reading is OK:
Proceed to step 15
- If reading is incorrect:
Proceed to step 14
14. Replacing component
- Try a new oil temperature sensor, refer to replacement. Service and Repair
- Then continue with step 15






15. Verification

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

- Preparation:
Ignition OFF
Reconnect the connectors, reinstall components etc.
Go into scrolling values.
Ignition ON
Read off oil temperature.
- Check that the transmission oil temperature is within bounds.
- Compare with the transmission temperature.
- Is the oil temperature within bounds?
YES:Fault corrected
NO: Proceed to step 16
16. 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





17. Intermittent fault
- Preparation:
Ignition OFF
- Check transmission and TCM connectors 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 cable between the oil temperature sensor and transmission control module (TCM) #A14 for:
An intermittent open-circuit according to step 2 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
- Check the cable between the oil temperature sensor and transmission control module (TCM) #A15 for an intermittent open-circuit according to step 2 of checking for intermittent faults. Checking For Intermittent Faults
- Then continue with step 18
18. 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

pro multis · About Operation CHARM