Mazda MX-5 Miata Sport 2007 Manual page 2069

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata


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 appears wave, when the engine speed drops below 2,200 rpm.
(See PCM INSPECTION [LF] .)
If not as specified, inspect the following.





FUEL PUMP OPERATION INSPECTION
1. Remove the fuel-filler cap.
2. Turn the ignition switch to the ON position.
3. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard.
If no operation sounds is heard, proceed to next step.

2007 Mazda MX-5 Miata Sport
[LF] .)
Neutral switch and related harness
(See NEUTRAL SWITCH INSPECTION [LF] .)
Clutch switch and related harness
(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [LF] .)
ECT sensor and related harness
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION
[LF] .)
Neutral switch and related harness (MT)
(See NEUTRAL SWITCH INSPECTION [LF] .)
Clutch switch and related harness (MT)
(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [LF] .)
TR switch and related wiring harness (AT)
(See TRANSMISSION RANGE (TR) SWITCH INSPECTION [SJ6A-EL] .)