With SST-Engine Signal Monitor
MASS AIR FLOW SENSOROperational Inspection:
1. Check the mass air flow sensor for damage and cracks.
2. Remove the ECM.
3. Connect the SSTs (Monitor, Engine Signal and Adapter Harness) to the ECM.
4. Measure the voltage at the ECM terminals as shown in the table below.
5. If not as specified, inspect the following:
Harness continuity
- Between ECM terminal 3B and mass air flow sensor terminal B
- Between ECM terminal 4A and mass air flow sensor terminal E
- Between main relay terminal D and mass air flow sensor terminal A
Terminal voltage
- Mass air flow sensor terminal A: Battery positive voltage
6. If there is incorrect terminal voltage or harness continuity, replace the mass air flow sensor.
Inspection/Integral Intake Air Temperature Sensor:
1. Disconnect the mass air flow sensor connector.
2. Measure the resistance between terminals C and D by using an ohmmeter.
Specification: 2.21 - 2.69 kOhms 20 °C (68 °F)
3. If not as specified, replace the mass air flow sensor.