DF9

- Key "OFF".

- Plug Manifold Absolute Pressure (MAP) sensor vacuum supply hose.

- Start engine and maintain 1500±100 engine rpm.

- Slowly apply 51 kPa (15 in Hg) vacuum to MAP sensor.

- While maintaining rpm, perform Key On Engine Running (KOER) Self-Test. Key ON Engine Running (KOER) Self-Test

- Is KOER Diagnostic Trouble Code (DTC) 22/126 still present?

NOTE: Disregard any other DTCs at this time.

Yes -- Replace MAP sensor. Connect vacuum supply hose to MAP sensor. Rerun quick test.

No -- Inspect vacuum supply hose to MAP sensor. Service as necessary.

If OK, service other KOER DTCs.

If none, return to Diagnostic Routines to address any drive concerns.