Fuel Cut Control System Inspection

NOTE:

This inspection has to be performed after the Fuel Injector Operation Inspection.

If data monitor function of M-MDS is used:

Warm up the engine and idle it.
Connect the M-MDS to the DLC-2.
Select the RPM and the FUELPW PIDs. (See ON-BOARD DIAGNOSTIC TEST [PCM (VIN Y)] .)
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 FUELPW 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 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)

If data monitor function of 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 the wave appears when the engine speed drops below 1, 200 rpm. (See PCM INSPECTION .)
- If not as specified, inspect the following:
  - ECT sensor and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)