Circuit Description

Powertrain Control Module (PCM) internal circuitry can identify if vehicle fuel system is capable of supplying adequate amounts of fuel during heavy acceleration (power enrichment). When a power enrichment mode of operation is requested, PCM will allow additional fuel to be provided to the engine. If PCM does not detect a rich exhaust, a DTC P1171 will set.

Conditions for setting this DTC are as follows:

• O2S 1 voltage is less than 300 mV for 5 seconds.
• O2S 1 is operating in closed loop.
• No presence of Codes: P0131-P0134.
• Fuel injector BPW is more than zero.
• Fuel delivery system is in power enrichment mode.