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
- If no damage, leakage or incorrect installation is found
Ignition ON.
Verify the 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 brake booster pump motor does not turn ON and OFF
  Refer to Circuit/System Testing .
- If the brake booster pump motor turn ON and OFF
All OK.