DC22 - Check MAF SIG For Short to Power In PCM

- Key Off.

- MAF sensor disconnected.

- PCM disconnected.

- Disconnect Scan Tool from Data Link Connector (if applicable).

- Measure the resistance between Test Pin 88 (MAF SIG) and Test Pins 71 or 97 (VPWR) at the breakout box.

- Is the resistance greater than 10,000 ohms?

YES -- MAF SIG shorted to power in the PCM. REPLACE damaged PCM. REMOVE breakout box. RECONNECT MAF sensor. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- SERVICE short between MAF SIG and VREF in harness circuit. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes