Visual/Physical Check
- Verify that the control module grounds are clean, tight and correctly located.
- Verify that the vacuum hoses are not split or kinked and are correctly connected, as shown on the Vehicle Emission Control Information label.
- Verify that the air filter is clean and free from restrictions.
- Verify that there is no water intrusion in connectors terminals and components.
- Inspect the air intake ducts for the conditions listed below:
- Collapsed
- Damaged areas
- Looseness
- Incorrect installation
- Leaking
If any condition listed above has allowed non-metered air to enter the air induction system, the Q38 Throttle Body: Throttle/Idle Learn procedure must be performed after the repair is complete.
- Inspect for air leaks at the throttle body mounting area, the mass air flow (MAF) sensor and intake manifold sealing surfaces.
- Inspect the wiring harness for the following conditions:
- Poor connections
- Pinches
- Cuts
- Inspect for loose, damaged, unseated or missing sensors/components.
- Inspect the terminals for corrosion and correct contact.