Part 4

Checking diagnostic trouble codes (DTCs) (Continued)

Brake valve adjustment

- Ignition off.
- Control module disconnected.
- Vacuum pump connected.
- Disconnect hose connectors so the vacuum servo releases.
- Press pedal so that it is not in contact with the valve.
- Pull piston out as far as possible and release pedal slowly. The plastic snap fitting in the valve should then retain the piston in the correct position.
- Ignition on.
- Connect the single cable between control module connector terminal 1S and terminal 7T.
- Connect the other cable with the double blade terminal to control module connector terminal 3S, connect one end of the cable to control module connector terminal 9S. Connect the other end of the cable to control module connector terminal 7S.
The vacuum pump should start and the vacuum servo should pull the throttle mechanism to wide open throttle (WOT).

- Stop the vacuum pump when the vacuum servo has fully contracted by disconnecting the cable connected to the control module connector terminal 7S.
- Depress brake pedal.

Does the brake valve let air into the system so that the vacuum servo releases?

Yes - FAULT FOUND

No - Replacing component

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Checking component
- 1. Manual transmission: Checking the clutch valve.
- 2. Automatic transmission: Checking vacuum system completed.

Select one of the alternatives above.

1 - Checking the clutch valve

2 - No Fault Found

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Replacing component

- Ignition off.
- Try a new brake valve according to Replacing brake and clutch valves Service and Repair.

Continue - Verification, vacuum servo

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Checking the clutch valve

- Ignition off.
- Control module disconnected.
- Vacuum pump connected.
- Ignition on.
- Connect the single cable between control module connector terminal 1S and terminal 7T.
- Connect the other cable with the double blade terminal to control module connector terminal 3S, connect one end of the cable to control module connector terminal 9S. Connect the other end of the cable to control module connector terminal 7S.
The vacuum pump should start and the vacuum servo should pull the throttle mechanism to wide open throttle (WOT).

- Stop the vacuum pump when the vacuum servo has fully contracted by disconnecting the cable connected to the control module connector terminal 7S.
- Depress clutch pedal.

Does the clutch valve let air into the system so that the vacuum servo releases?

Yes - No Fault Found

No - Clutch valve adjustment

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Clutch valve adjustment

- Ignition off.
- Disconnect cables.
- Disconnect hose connectors so the vacuum servo releases.
- Press pedal so that it is not in contact with the valve.
- Pull piston out as far as possible and release pedal slowly. The plastic snap fitting in the valve should then retain the piston in the correct position.
- Control module disconnected.
- Vacuum pump connected.
- Ignition on.
- Connect the single cable between control module connector terminal 1S and terminal 7T.
- Connect the other cable with the double blade terminal to control module connector terminal 3S, connect one end of the cable to control module connector terminal 9S. Connect the other end of the cable to control module connector terminal 7S.
The vacuum pump should start and the vacuum servo should pull the throttle mechanism to wide open throttle (WOT).

- Stop the vacuum pump when the vacuum servo has fully contracted by disconnecting the cable connected to the control module connector terminal 7S.
- Depress clutch pedal.

Does the clutch valve let air into the system so that the vacuum servo releases?

Yes - FAULT FOUND

No - Replacing component

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Replacing component

- Ignition off.
- Try a new clutch valve according to Replacing brake and clutch valves Service and Repair.

Continue - Verification, vacuum servo

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Verification, regulator

Verification

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

The regulator should click.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Verification, vacuum pump

Verification

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

- Ignition off.
- Disconnect control module.
- Vacuum pump connected.
- Ignition on.
Connect the single cable between control module connector terminal 1S and terminal 7T.
Connect the other cable with the double blade terminal to control module connector terminal 3S.
Connect both ends of the cable to terminal 9S and terminal 7S and the vacuum pump will start and the vacuum servo contract. Remove the cable from terminal 7S when the vacuum servo is fully contracted.
Check that the vacuum servo has not released the throttle control at all after 30 seconds.

Did the vacuum pump start?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Verification, vacuum servo

Verification

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

- The vacuum pump should start and pull the vacuum servo fully open.
- Stop the vacuum pump when the vacuum servo has fully contracted by disconnecting the cable connected to the control module connector terminal 7S.
- Depress brake/clutch pedal.

The vacuum pump should now release.

OK - VERIFIED

Not OK - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - 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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Attempt New Test - Checking ground lead and power supply

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Connection of Volvo Scan Tool (ST)

Connection of Volvo ST

- Ignition off.
- Insert blue memory cassette into Volvo ST.
- Connect adapter 951 1457-5 to cable 951 1458-3.
- Connect VIDA communication lead between the adapter and the VIDA PC.

Is the data link connector (DLC) located in passenger compartment?

Yes - Connection to DLC

No - Connection to DLC

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Connection to DLC
- Connect Volvo ST cable (p/n 951 1458-3) to the adapter (p/n 951 1459-1) for use in the engine compartment.
- Connect the adapter to DLC A or B, see DLC DLC.
- Connect the adapter supply lead to battery.
- Switch on Volvo ST.

Press Continue.

Continue - DONE

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Connection to DLC
- Connect Volvo ST cable (p/n 951 1458-3) to the DLC in passenger compartment.
- Switch on Volvo ST.

Press Continue.

Continue - DONE

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DONE - Checking vacuum supply pipe

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VERIFIED - Information

No Fault Found - Information

FAULT-TRACING FAILED - Information

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Volvo Scan Tool (ST)
Connection
FAULT FOUND - Checking diagnostic trouble code (DTC)

No Fault Found - Connecting

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Connecting

Connecting the Volvo Scan Tool (ST)

Connecting the Volvo Scan Tool (ST)
- Insert the blue memory cassette into the Volvo Scan Tool (ST)
- Connect adapter 951 1457-5 to cable 951 1458-3.
- Connect the VIDA cable between the adapter and the VIDA PC.

Is the data link connector (DLC) in the passenger compartment?

Yes - Data link connector (DLC) terminal

No - Data link connector (DLC) terminal

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Data link connector (DLC) terminal
- Connect cable from Volvo Scan Tool (ST) (no. 951 1458-3) to the adapter (no. 951 1459-1) for use in the engine compartment.
- Connect adapter to data link connector (DLC) A or B, see DLC DLC.
- Connect adapter cables to the battery.
- Power up the Volvo Scan Tool (ST).

Continue - DONE

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Data link connector (DLC) terminal
- Connect cable from Volvo Scan Tool (ST) (no. 951 1458-3) to the data link connector (DLC) in the passenger compartment.
- Power up the Volvo Scan Tool (ST).

Continue - DONE

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DONE - Checking diagnostic trouble code (DTC)

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Information

Are several diagnostic trouble codes (DTCs) stored?

Yes - Checking diagnostic trouble code (DTC)

No - FAULT FOUND

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Checking diagnostic trouble code (DTC)
- 1. Diagnostic trouble code (DTC) 1-1-2 stored.
- 2. Diagnostic trouble code (DTC) 1-2-2 stored.
- 3. Diagnostic trouble code (DTC) 2-1-1 stored.
- 4. Diagnostic trouble code (DTC) 2-1-2 stored.

Select one of the alternatives above.

1 - Fault-tracing diagnostic trouble code (DTC) 1-1-2

2 - Fault-tracing diagnostic trouble code (DTC) 1-2-2

3 - Fault-tracing diagnostic trouble code (DTC) 2-1-1

4 - Fault-tracing diagnostic trouble code (DTC) 2-1-2

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