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Diagnostic Aids

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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