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Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for the following conditions:

  1. Mass Air Flow (MAF) is compared to a calculated mass air flow based upon the manifold absolute pressure (MAP), the throttle position (TP), and the engine RPM readings. A skewed or unresponsive MAP sensor at KEY ON will cause the predicted air flow value to be inaccurate. Compare the MAP and the TP sensor value to that of a known good vehicle.
  2. Faulty engine coolant temperature (ECT) sensor. Using a scan tool, compare engine coolant temperature with intake air temperature (IAT) on a completely cool engine. The engine coolant temperature should be within 5°F (3°C) of the intake air temperature. If not, diagnose DTC P0128. See SELF-DIAGNOSTICS - 3.4L MONTANA, SILHOUETTE & VENTURE or SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS article.
  3. For intermittent condition testing, see INTERMITTENTS in TROUBLESHOOTING - NO CODES - TRUCKS article.

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