Reading and Clearing Diagnostic Trouble Codes
Reading off diagnostic trouble codes (DTCs), Road Traffic Information (RTI)
Query
Connecting
Connecting the Volvo Scan Tool (ST)
The Volvo Scan Tool (ST) must be connected to the VIDA PC and data link connector (DLC) in the passenger compartment.
Is the Volvo Scan Tool (ST) connected and switched on?
Yes - Reading off diagnostic trouble codes
No - Connecting Volvo System Tester
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Connecting Volvo System Tester
Connecting the Volvo Scan Tool (ST)
- Ignition off.
Insert the blue memory cassette in the Volvo Scan Tool (ST).
Connect adapter 951 1457 Adaptor 951 1457 Adaptor to the cable 951 1458 Scan tool cable 6 meters 951 1458 Scan Tool Cable 6 Meters.
Connect VIDA communication cable between adapter and VIDA PC.
Connect cable 951 1458 Scan tool cable 6 meters 951 1458 Scan Tool Cable 6 Meters from Volvo Scan Tool (ST) to the data link connector (DLC) in the passenger compartment.
Switch on the Volvo Scan Tool (ST) switch.
Continue - Reading off diagnostic trouble codes (DTCs)
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Reading off diagnostic trouble codes (DTCs)
- Ignition on
Read off diagnostic trouble codes (DTCs).
Numeric Result 0 - DONE
Numeric Result -8 - Communication problems
Numeric Result -1 - Communication problems
Numeric Result -2 - Communication problems
Numeric Result -3 - Communication problems
Numeric Result -4 - Communication problems
Numeric Result -5 - Communication problems
Numeric Result -6 - Communication problems
Numeric Result -7 - Communication problems
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Communication problems
Communication has been interrupted for one of the following reasons:
- The cable is disconnected
- The Volvo Scan Tool (ST) is disconnected
- Communication problems in the VIDA application
- Check that the adapter is correctly connected to the Volvo Scan Tool (ST).
- Check that the VIDA cable is correctly connected to the adapter junction box and VIDA cart.
- Check that the power cable is correctly connected to the battery and Volvo Scan Tool (ST).
- Ensure that VIDA memory cassette is inserted into the Volvo Scan Tool (ST).
- Check that the junction box switch is on.
- Try to establish communication again or exit reading off diagnostic trouble codes (DTCs).
Depending on the communication fault, select one of the the following alternatives.
1. Try again.
2. Fault-trace the communication problems.
3. Stop fault-tracing.
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Communication problems
Communication has been interrupted for one of the following reasons:
- The cable is disconnected
- Ignition off
The fault could also have been stored by a communication problem when the engine was started.
- Check that the data link connector (DLC) cable is secure.
- Try to establish communication again or exit reading off diagnostic trouble codes (DTCs).
Depending on the communication fault, select one of the the following alternatives.
1. Try again.
2. Fault-trace the communication problems.
3. Stop fault-tracing.
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Checking communication
Checking communication with RTI control module
Checking power supply
- Ignition on
- Volvo Scan Tool (ST) connected to data link connector (DLC).
Power up the Volvo Scan Tool (ST) and check that the display lights
Does the display light?
Yes - Checking communication with the ABS system
No - Checking Volvo Scan Tool (ST)
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Checking Volvo Scan Tool (ST)
Checking communication equipment
Checking power supply
- Ignition on.
Connect Volvo Scan Tool (ST) to the data link connector (DLC) and turn on power supply using the switch on the adapter box.
Check the Volvo Scan Tool (ST) display.
Does the display light?
Yes - Checking wiring
No - Checking power supply to the data link connector (DLC)
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Checking power supply to the data link connector (DLC)
- Ignition off.
- Disconnect Volvo Scan Tool (ST) and remove connector from the data link connector (DLC).
Connect a voltmeter between the data link connector (DLC) terminal 16 and ground.
The voltmeter should read battery voltage.
OK - Checking power ground to the data link connector (DLC)
Not OK - Checking the fuse and the cable
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Checking the fuse and the cable
Check fuse and cable between data link connector (DLC) terminal 16 and battery positive terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking power ground to the data link connector (DLC)
- Ignition off.
Connect an ohmmeter between the data link connector (DLC) terminal 4 and ground.
The ohmmeter should read 0 ohms.
OK - Checking data link connector (DLC) signal ground
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check cable between data link connector (DLC) terminal 4 and ground terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking data link connector (DLC) signal ground
- Ignition off.
Connect an ohmmeter between the data link connector (DLC) terminal 5 and ground.
The ohmmeter should read 0 ohms.
OK - Checking power supply to the adapter box
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check cable between data link connector (DLC) terminal 5 and ground terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking power supply to the adapter box
- Ignition on.
- Volvo Scan Tool (ST) connected to the data link connector (DLC).
- Disconnect the Volvo Scan Tool (ST) wiring at the adapter box.
Connect a voltmeter between ground and 25-pin connector terminals:
- 15 (to data link connector (DLC))
- 20 (to data link connector (DLC))
- 21 (to data link connector (DLC))
- 22 (to data link connector (DLC))
The voltmeter should read battery voltage in all readings.
OK - Checking power ground to the adapter box
Not OK - Replacing component
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Replacing component
Try with new wiring to the Volvo Scan Tool (ST).
Continue - Verification
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Checking power ground to the adapter box
- Ignition off.
- Volvo Scan Tool (ST) wiring connected to the data link connector (DLC).
- Wiring disconnected from the adapter box.
Connect a voltmeter between ground and the 25-pin connector terminals:
- 23 (to data link connector (DLC))
- 24 (to data link connector (DLC))
- 25 (to data link connector (DLC))
The ohmmeter should read 0 ohms in all readings.
OK - Checking power supply to Volvo Scan Tool (ST)
Not OK - Replacing component
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Checking power supply to Volvo Scan Tool (ST)
- Ignition on.
- Volvo Scan Tool (ST) wiring connected to the data link connector (DLC).
- Connect Volvo Scan Tool (ST) to the adapter box.
- Disconnect the 3-pin connector.
- Power switch on the adapter box ON.
Connect a voltmeter between 3-pin connector terminals:
- #1 (to data link connector (DLC)) and ground
- #3 (to data link connector (DLC)) and ground
The voltmeter should read 7-9 V between terminal 3 and ground, and battery voltage between terminal 1 and ground.
OK - Checking ground to Volvo Scan Tool (ST)
Not OK - Replacing component
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Replacing component
Try a new adapter box.
Continue - Verification
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Checking ground to Volvo Scan Tool (ST)
- Ignition off.
- Cabling to Volvo Scan Tool (ST) connected to the data link connector (DLC).
- 3-pin connector disconnected from Volvo Scan Tool (ST).
Connect an ohmmeter between the 3-pin connector terminal 2 (to the data link connector (DLC)) and ground.
The ohmmeter should read 0 ohms.
OK - Checking display activation
Not OK - Replacing component
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Checking display activation
- Ignition off.
- Connect Volvo Scan Tool (ST) to the adapter box and wiring.
- Connect Volvo Scan Tool (ST) to the data link connector (DLC).
- Ignition on.
Turn on power supply using the switch on the adapter box.
Check the Volvo Scan Tool (ST) display.
Does the display light?
Yes - Fault-tracing information
No - Replacing component
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Fault-tracing information
- The fault was probably caused by loose connections in connectors or wiring. Check the Volvo Scan Tool (ST), adapter box, wiring and data link connector (DLC) for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Replacing component
Try a new Volvo Scan Tool (ST).
Continue - Verification
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Checking wiring
- Ignition off.
- Disconnect Volvo Scan Tool (ST).
- Disconnect wiring 1/6 meters.
Connect an ohmmeter between the 16-pin and 25-pin connectors according to the table below:
The ohmmeter should read 0 ohms in all readings.
OK - Checking for a short-circuit in the wiring
Not OK - Replacing component
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Checking for a short-circuit in the wiring
- Ignition off.
- Wiring 1/6 meters disconnected.
To find a short-circuit, all terminals/wires in the cable must be checked for a short-circuit to each other. Take readings in the 16-pin connector.
Connect an ohmmeter between the 16-pin connector terminal pins:
- #1 and the other terminals
- #2 and the other terminals
Take readings for the other terminals in the same way.
The ohmmeter should read infinite resistance for all readings.
OK - Checking communication with other diagnostic systems
Not OK - Replacing component
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Checking communication with other diagnostic systems
- Ignition off.
- Connect Volvo Scan Tool (ST) to the adapter box and wiring.
- Connect Volvo Scan Tool (ST) to the data link connector (DLC) and turn on the power supply using the switch on the adapter box.
- Ignition on.
Try to establish communication with the ABS control module by reading off diagnostic trouble codes (DTCs).
Has communication been established?
Yes - Fault-tracing information
No - Replacing component
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Replacing component
Try a new Volvo Scan Tool (ST) and adapter box.
Continue - Verification
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Checking communication with the ABS system
- Ignition on
- Volvo Scan Tool (ST) connected to data link connector (DLC).
Establish communication with the ABS system by reading off a value in the scrolling values.
Has communication with the ABS system been established?
Yes - Check the communication cable, power supply and ground for RTI control module
No - Checking the communication cable
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Checking the communication cable
Hint: If there is no communication with the ABS system either it means that there is a fault in the circuit between the connected control modules in the circuit and the data link connector (DLC).
Check the cable between the data link connector (DLC) terminal 7 and the connected control modules for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the data link connector (DLC) connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If no faults are found, check Volvo Scan Tool (ST) according to Service Manual Volvo Scan Tool (ST).
Remedy as necessary.
Other information:
- For connecting breakout box, see Connecting the breakout box Connecting the Breakout Box.
- The communication cable voltage should be approximately 9-11 V when ignition is on. This applies if the Volvo Scan Tool is not connected. For other signals, see Signal specification Road Traffic Information (RTI) Signal Specification Road Traffic Information (RTI).
Continue - Verification
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Check the communication cable, power supply and ground for RTI control module
Check that fuses 15, 30 and 2 are undamaged. If any of the fuses have been damaged check the fuse circuit for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Then replace the fuse.
Check the RTI control module for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between data link connector (DLC) terminal 7 and control module #B13 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the power supply to the RTI control module #B1, #B2 and #B12 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the ground cable between the RTI control module #B8 and the ground terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Continue - Verification
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Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition off.
- Reconnect connectors, reinstall components.
- RTI control module connected.
- Ignition on
- Volvo Scan Tool (ST) connected to data link connector (DLC).
Try to establish communication with the RTI system by reading off the status for the light switch position.
Has communication with the RTI system been established?
Yes - Fault has been remedied
No - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Fault-tracing information
Fault-tracing information
Fault-tracing information
Fault-tracing communication problems is now finished.
Do you want to try establishing communication again?
Yes - Repeat test
No - Exit fault-tracing
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