DC11 - Monitor MAF Circuit Under Simulated Road Shock

- Key "OFF".

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins. corrosion, loose wires, etc. Service as necessary.

- Install breakout box, reconnect PCM.

- Connect Digital Volt/Ohm Meter (DVOM) between test pin 50 and test pin 9 (Sequential Fuel Injection (SFI) vehicles) or test pin 14 and test pin 15 (Multiport Fuel Injection (MFI) vehicles) at the breakout box.

- Key "ON", engine running.

- Lightly tap on Mass Air Flow (MAF) sensor and wiggle harness connector to simulate road shock.

NOTE: MAF voltage is normally above 0.4 volt. A sudden change down from this minimum limit indicates a fault.

- Is a fault indicated?

Yes -- Disconnect and Inspect MAF sensor connector. If OK, replace MAF sensor. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- LEAVE DVOM and PCM connected. Go to DC12. DC12 - Check Vehicle Harness For Intermittent Opens or Shorts