DTC 33

Fig. 015 - WIRING DIAGRAM FOR Code 33 Mass Air Flow Sensor. VIN 3, VIN 9:

CODE 33, MASS AIR FLOW (MAF) SENSOR

The MAF sensor measures the flow of air entering the engine. This information is used by the ECM for fuel control.
Code 33 is set when:
- Engine is idling
- TPS is 10% or less
- Air Flow more than 150 grams per second (high frequency).
- All of the above are met for 5 seconds or more.

Fig. 014 - Chart - Code 33 Mass Air Flow Sensor (Signal Frequency High):

1. Checks to see if the ECM recognizes a problem.
2. Inspect wire routing of high voltage wires such as spark plug wires. Such wires routed too closely to MAF wiring harness could possibly cause an intermittent code 33.