Fuel Cut Control System Inspection

If simulation function of M-MDS is used: 

1. Warm up the engine and idle it.
2. Access the RPM and the FUELPW1 PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST ).
3. Monitor both PIDs while performing the following steps:
   1. Depress the accelerator pedal and increase the RPM PID to 4, 000 rpm  .
   2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the FUELPW1 PID is 0 msec  , and 2-5 msec  , when the RPM PID drops below 1, 200 rpm  .
      • If not as specified, inspect the following.
        • ECT sensor No. 1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).

If simulation function of M-MDS is not used: 

1. Warm up the engine and idle it.
2. Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps.
   1. Depress the accelerator pedal and increase the engine speed to 4, 000 rpm  .
   2. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+  , and the wave appears when the engine speed drops below 1, 200 rpm  . (See PCM INSPECTION ).
      • If not as specified, inspect the following.
        • ECT sensor No. 1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).