Vacuum Pump Control Circuit A Range/Performance

Where it lives

For P258B, start at the pump the description names.

Check these first

• A vacuum pump control A signal outside its expected range
• A failed vacuum pump
• High resistance in the vacuum pump control A circuit
• A vacuum leak in the brake booster system

What to do next

1. Read the vacuum pump control A circuit on a scan tool
2. Test the vacuum pump control A circuit for added resistance
3. Check the vacuum pump output
4. Check the brake booster system for vacuum leaks
5. Replace the vacuum pump if the circuit and booster test good
6. Clear the code and retest

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