Part 3
Checking the vacuum system
Checking the voltage to the vacuum pump
- Ignition off.
- Control module connected.
- Vacuum pump removed.
- Ignition on.
Connect a voltmeter between vacuum pump connector terminal #2 and ground.
The voltmeter should read approximately 0 V.
OK - Checking the resistance in the cable
Not OK - Checking for a short-circuit
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Checking for a short-circuit
- Ignition off.
- Check the cable between vacuum pump connector terminal #2 and control module connector terminal #9 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification of the vacuum pump
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Checking the resistance in the cable
- Ignition off.
- Disconnect the control module.
- Vacuum pump removed.
Connect an ohmmeter between vacuum pump connector terminal #2 and control module connector terminal #9.
The ohmmeter should read approximately 0 ohms
OK - Checking the vacuum pump
Not OK - Checking for an open-circuit
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Checking for contact resistance and oxidation
- Ignition off.
- Check the control module terminal and vacuum pump connectors for contact resistance and oxidation and for loose connections. Remedy contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Continue - Verification of the vacuum pump
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Checking for an open-circuit
- Ignition off.
- Check the cable between vacuum pump connector terminal #2 and control module connector terminal #9 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification of the vacuum pump
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Checking the vacuum pump
- Ignition off.
- Vacuum pump removed.
- Temporarily connect a cable between vacuum pump pin terminal #3 and the battery positive terminal. Connect a cable between vacuum pump pin terminal #2 and the battery negative terminal. The vacuum pump should start.
- Remove the temporarily connected cables.
Did the vacuum pump start?
Yes - Checking for contact resistance and oxidation
No - Replacing the component
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Checking for contact resistance and oxidation
- Ignition off.
- Check the control module terminal and vacuum pump connectors for contact resistance and oxidation and for loose connections. Remedy contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy loose connections according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Continue - Verification of the vacuum pump
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Replacing the component
- Ignition off.
- Replace the vacuum pump according to Vacuum pump and regulator Service and Repair.
Continue - Verification of the vacuum pump
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Checking brake valves
- Ignition off.
- Control module disconnected.
- Vacuum pump connected.
- Ignition on.
- Connect the single wire cable between terminals #11 and #1 on the control module connector.
- Connect the other cable with the double flat terminal pins to control module connector terminal #10. Connect one end of the cable to control module connector terminal #12. Connect the other end of the cable to control module connector terminal #9.
The vacuum pump should start. The vacuum regulator should open the throttle mechanism fully.
- Stop the vacuum pump when the vacuum regulator has reached its limit position: Remove the cable from control module connector terminal #9.
- Depress the brake pedal.
Does the brake valve release air into the system so that the vacuum regulator deploys?
Yes - Fault-tracing information
No - Adjusting the brake valve
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Fault-tracing information
- Only cars with manual transmissions have a clutch valve. Specify the type of transmission before continuing with fault-tracing.
Does the car have a manual transmission?
Yes - Checking the clutch valve
No - No Fault Found
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Adjusting the brake valve
- Ignition off.
- Control module disconnected.
- Vacuum pump connected.
- Detach the hose connectors so that the vacuum regulator deploys.
- Depress the pedal so that it is not in contact with the valve.
- Pull out the piston as far as possible. Slowly release the pedal. The plastic snap fastener in the valve should then retain the piston in the correct position.
- Ignition on.
- Connect the single wire cable between terminals #11 and #1 on the control module connector.
- Connect the other cable with the double flat terminal pins to control module connector terminal #10. Connect one end of the cable to control module connector terminal #12. Connect the other end of the cable to control module connector terminal #9.
The vacuum pump should start. The vacuum regulator should open the throttle mechanism fully.
- Stop the vacuum pump when the vacuum regulator has reached its limit position: Remove the cable from control module connector terminal #9.
- Depress the brake pedal.
Does the brake valve release air into the system so that the vacuum regulator deploys?
Yes - FAULT FOUND
No - Replacing the component
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Checking components
- 1. Manual transmissions: Checking the clutch valve
- 2. Automatic transmissions:The vacuum system check is now complete.
Select one of the above options.
1 - Checking the clutch valve
2 - No Fault Found
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Replacing the component
- Ignition off.
Try a new brake valve.
Continue - Verification of the vacuum regulator
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Checking the clutch valve
- Ignition off.
- Control module disconnected.
- Vacuum pump connected.
- Ignition on.
- Connect the single wire cable between terminals #11 and #1 on the control module connector.
- Connect the other cable with the double flat terminal pins to control module connector terminal #10. Connect one end of the cable to control module connector terminal #12. Connect the other end of the cable to control module connector terminal #9.
The vacuum pump should start. The vacuum regulator should open the throttle mechanism fully.
- Stop the vacuum pump when the vacuum regulator has reached its limit position: Remove the cable from control module connector terminal #9.
- Depress the clutch pedal.
Does the brake valve release air into the system so that the vacuum regulator deploys?
Yes - No Fault Found
No - Adjusting the clutch valve
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Adjusting the clutch valve
- Ignition off.
- Disconnect the wiring.
- Detach the hose connectors so that the vacuum regulator deploys.
- Depress the pedal so that it is not in contact with the valve.
- Pull out the piston as far as possible. Slowly release the pedal. The plastic snap fastener in the valve should then retain the piston in the correct position.
- Control module disconnected.
- Vacuum pump connected.
- Ignition on.
- Connect the single wire cable between terminals #11 and #1 on the control module connector.
- Connect the other cable with the double flat terminal pins to control module connector terminal #10. Connect one end of the cable to control module connector terminal #12. Connect the other end of the cable to control module connector terminal #9.
The vacuum pump should start. The vacuum regulator should open the throttle mechanism fully.
- Stop the vacuum pump when the vacuum regulator has reached its limit position: Remove the cable from control module connector terminal #9.
- Depress the clutch pedal.
Does the brake valve release air into the system so that the vacuum regulator deploys?
Yes - FAULT FOUND
No - Replacing the component
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Replacing the component
- Ignition off.
- Replace the clutch valve according to Clutch pedal vacuum valve, replacement Service and Repair.
Continue - Verification of the vacuum regulator
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Verification of the governor
VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Verification of the vacuum pump
VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Verification of the vacuum regulator
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 the ground lead. Checking the power supply
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DONE - Checking the ground lead. Checking the power supply
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