Circuit/System Verification

Verify that the brake booster vacuum system has no damage, leakage or incorrect installation.
- If damage, leakage or incorrect installation is found
  Refer to Brake Assist System Diagnosis
- Go to next step: If no damage, leakage or incorrect installation is found
Ignition ON.
Verify the M9 Brake Booster Pump Motor turns ON and OFF when commanding the Brake Booster Electric Vacuum Pump ON and OFF with a scan tool.
- If the M9 Brake Booster Pump Motor does not turn ON and OFF
  Refer to Circuit/System Testing.
- Go to next step: If the M9 Brake Booster Pump Motor turn ON and OFF
All OK.