H20 - Attempt to Eliminate DTC 136, 172 or 176 w/MAP Sensor

- Key "OFF".

- Breakout box installed.

- Disconnect and plug Manifold Absolute Pressure (MAP) vacuum line.

- Connect Powertrain Control Module (PCM) to breakout box.

- Reconnect Heated Oxygen Sensor (HO2S).

- Start engine and apply 34.47 kPa (10-14 in Hg) vacuum to MAP sensor.

- Run engine at approximately 2000 rpm for two minutes. Allow engine to return to idle.

- Rerun Engine Running Self-Test. Key ON Engine Running (KOER) Self-Test

NOTE: If you are here for Continuous Memory Diagnostic Trouble Codes (DTC) the vehicle has to be driven 5 miles/55 mph.

- Is DTC 136, 172 or 176 still present (ignore all other DTCs)?

Yes -- Remove breakout box. Reconnect MAP sensor vacuum line. If engine runs rough, go to S2. S2 - Check For RPM Drop

All others Replace PCM. Drive vehicle 5 miles/55 mph. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Remove breakout box. Reconnect PCM and MAP sensor vacuum line. HO2S input OK. Fuel delivery is OK. Problem is in an area common to all cylinders, i.e. air/vacuum leak, fuel contamination, Exhaust Gas Recirculation (EGR), Secondary Air Induction (AIR), check MAP frequency, ignition system, etc. Service as necessary.