
FUEL CUT CONTROL SYSTEM INSPECTION
If simulation function of M-MDS is used:
1. Warm up the engine and idle it.
2. Connect the M-MDS or equivalent to DLC-2.
3. Select the RPM and FUELPW1 PIDs.
4. 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 FUELPW1
PID is
0 ms.
, and
2-5 ms.
when the RPM PID drops
below 1,200 rpm.
If not as specified, inspect the following.
ECT sensor and related harness
(See
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION
Go to Step 3.
2
Perform main relay
operation inspection.
Is main relay operation
normal?
Yes
Inspect the following:
Fuel injector power
system related
wiring harness and
connectors
PCM connectors
Fuel injector GND
and related wiring
harness and
connectors
No
Repair or replace
malfunctioning parts.
3
Switch fuel injector
connector of not
operating fuel injector
with operating fuel
injector.
Is operation sound heard?
Yes
Go to the next step.
No
Replace the fuel injector.
4
Are wiring harness and
connectors of not
operation fuel injector
normal? (Open or short)
Yes
Inspect PCM terminal
voltage of fuel injector
signal.
No
Repair or replace
malfunctioning parts.
NOTE:
This inspection has to perform after the Fuel Injector Operation Inspection.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:11 PM
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