Fuel Cut Control System Inspection

NOTE:

This inspection has to perform after the Fuel Injector Operation Inspection.

If simulation function of the M-MDS is used:

Warm up the engine and idle it.
Connect the M-MDS to the DLC-2.
Access the PCM PIDs RPM and FUELSYS1. (See ON-BOARD DIAGNOSTIC TEST article.)
Monitor the 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 FUELSYS1 PID is OL, and CL. when the RPM PID drops below 1,200 rpm.
  - If not as specified, inspect the following.
    - CHT sensor and related harness
      (See CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION article.)
    - TR switch and related wiring harness
      (See TRANSAXLE RANGE (TR) SWITCH INSPECTION article.)

If simulation function of the M-MDS is not used:

Warm up the engine and idle it.
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 appears wave, when the engine speed drops below 2,200 rpm.
  - If not as specified, inspect the following.
    - CHT sensor and related harness
      (See CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION article.)
    - TR switch and related wiring harness
      (See TRANSAXLE RANGE (TR) SWITCH INSPECTION article.)