DC9 - Check MAF Circuit For Short to GND and MAF RTN Circuit

- Key Off.

- MAF sensor disconnected.

- Breakout box installed, PCM disconnected.

- Disconnect Scan Tool from Data Link Connector (DLC).

- Measure the resistance between Test Pin 88 (MAF SIG) and Test Pins 36 (MAF RTN) and 24 or 103 (PWR GND) at the breakout box.

- Is each resistance greater than 10,000 ohms?

YES -- MAF SIG, MAF RTN and GROUND harness circuits to PCM are OK. RECONNECT Scan Tool. Go to DC10. DC10 - Check Continuity of MAF SIG Circuit

NO -- Service short circuit between MAF SIG and GROUND or MAF RTN. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes