G9 - Visual Vacuum Checks

Continuous Memory Diagnostic Trouble Code (DTC) 186 indicates injector pulse width lower than expected (rich).

Continuous Memory DTC 187 indicates pulse width higher than expected (lean).

- Inspect the air cleaner and air inlet ducting.

- Check for unmetered air between Mass Air Flow (MAF) sensor and Idle Air Control (IAC) solenoid.

- Check all engine vacuum hoses for damage, leaks, cracks, blockage, proper routing, etc.

- Are all the above vacuum checks OK?

Yes -- Go to G10. G10 - Check Fuel Pressure

No -- Service as necessary. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)