Differential Pressure Regulator: Testing and Inspection

COLD ACCELERATION ENRICHMENT





- Multimeter connected to differential pressure regulator with 1315 A/1 adapter and set to 200mA DC scale

NOTE: Engine must be less than 40°C (104°F). If necessary connect spare sensor to coolant sensor electrical connector. Connect spare sensor housing to ground with jumper cable.

- Disconnect oxygen sensor
- Start engine and let idle
- Measure regulator mA current
- Accelerate engine and measure regulator mA current
- Should increase approximately 6mA during acceleration

DECELERATION FUEL SHUT-OFF
- Engine fully warmed
- Multimeter connected to differential pressure regulator with adapter 1315 A/1 and set to 200mA scale
- Accelerate engine above 3,000 RPM
- Release throttle and check mA current
- Regulator current should decrease to approximately -50mA while throttle is closed until engine speed reaches approximately 1,200 RPM