Mazda MX-6 1998, Руководство по ремонту

Страница: 67 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP INSPECTION ACTION
20
CHECK FOR PRC SOLENOID VALVE
STUCK OPEN
• Key off.
• Breakout box installed. PCM connected.
• Install vacuum gauge at output port of PRC
solenoid valve.
• Vacuum pump installed at input port of
PRC solenoid valve.
• Apply -2 7 ------33 kPa {-2 0 3 ------247 mmHg,
- 8 ------10 inHg} of vacuum to PRC solenoid
valve input port.
• Key on.
• Momentarily jum per Test Pin 1
9 to Test Pin
103 at breakout box and observe vacuum
gauge.
Note
• PRC solenoid valve contains normally
open valve. If solenoid is energized while
vacuum is applied at input port, vacuum
signal will normally not be allowed to pass
because solenoid valve will be closed.
• Key off.
• Did vacuum gauge reading drop from
-2 7 ------ 33 kPa {-2 0 3 ------ 247 mmHg, - 8 —
-1 0 inHg} toO ------ 3.3 kPa {0 ------ 25
mmHg, 0 ------ 1 inHg} when Test Pin 19
was jumpered to Pin 103?
Yes PRC solenoid valve Is not stuck open.
REMOVE vacuum gauge and pump.
RECONNECT all component.
Go to next step.
No
PRC solenoid valve is stuck open.
REPLACE damaged PRC solenoid valve.
REMOVE vacuum gauge and pump.
RECONNECT all components.
RESET PCM to completely clear DTCs.
t r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
21 CHECK PCM CONTROL OF PRC
SOLENOID VALVE
• Key off.
• Breakout box installed. PCM connected.
• Install digital multimeter between Test Pin
19 and Test Pin 71 of breakout box.
• Record digital multimeter readings under
following conditions:
• Key on, engine off.
• Engine crank.
• Engine running (More than
10 seconds
after start-up).
Note
• PRC solenoid valve should only be
energized during engine crank for previous
conditions.
• Is voltage reading between Pin 19 and
Pin 71 10 — 12 V during engine crank and
0 — 2 V during other conditions?
Yes PCM is properly controlling the PRC solenoid valve.
REMOVE breakout box.
CHECK and REPLACE pressure regulator.
No PCM is not properly controlling PRC solenoid valve.
REMOVE breakout box.
REPLACE PCM.
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
22
CHECK SYSTEM ABILITY TO HOLD FUEL
PRESSURE
• Install fuel pressure gauge.
• Cycle key on and off several times.
• Verify there are no external leaks (Service
as necessary)
•
Does fuel pressure remain within
34
kPa
{0.35 kgf/cm2, 5 psi} of highest reading
after one minute?
Yes
For Continuous DTCs P1130, P0171 and P0172:
Go to step 31.
For No Starts:
Go to step 32.
For Fuel Control DTCs displayed with Misfire DTCs:
Go to step 33.
All other DTCs:
Go to step 34.
No Excessive pressure loss.
Go to next step.
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