Test TC-121B - 2/1 Fuel System Lean

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 2.5L article.

Inspect all O2S wiring and connectors. Repair wiring and connectors as necessary. Perform TEST VER-5A. If wiring and connectors are okay, perform following tests in order until problem is found:

Fuel pressure. Perform TEST NTC-3A.
Ignition system. Perform TEST NTC-2A.
Coolant temperature sensor. Perform TEST NTC-4A.
MAP sensor. Perform TEST NTC-6A.
Engine mechanical systems. Perform TEST NTC-18A.