Visual/Physical Check

NOTE: Use the connector test adapter kit J 35616-A for any test that requires probing the following items:

The PCM harness connectors
The electrical center fuse/relay cavities
The component terminals
The component harness connector

Using this kit will prevent damage caused by the improper probing of connector terminals.

Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a condition without further tests and can save time. This inspection should include the following areas:

Ensure that the control module grounds are clean, tight and correctly located. Refer to Master Electrical Component List and Power and Grounding Connector End Views .
Inspect vacuum hoses for splits, kinks and proper connections, as shown on the Vehicle Emission Control Information label. Inspect thoroughly for any type of a leak or a restriction. Refer to Emission Hose Routing Diagram (L26, NU3) and Evaporative Emissions (EVAP) Hose Routing Diagram .
Inspect for a dirty or restricted air filter.
Inspect for water intrusion in the mass air flow/intake air temperature (MAF/IAT) sensor connector, heated oxygen sensor (HO2S) connectors, control module connectors or any other harness connectors.
Inspect the air intake ducts, particularly between the MAF sensor and the throttle body for the following conditions:
- Collapsed
- Damaged areas
- Looseness
- Incorrect installation
- Leaking
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 terminals for corrosion and correct contact.