TD4 - Check MLP Circuit For Short to Power and Ground

- Key Off.

- MLP sensor disconnected.

- Breakout box installed, PCM disconnected.

- Measure resistance between Test Pin 64 and Test Pins 71 or 97, 76 or 77 and 91 at the breakout box.

- Measure resistance between Test Pin 64 at the breakout box and chassis ground.

- Is each resistance greater than 10,000 ohms?

YES -- GO to TD5. TD5 - Check MLP Sensor Resistance

NO -- SERVICE short in harness. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes