Mazda RX-8 Workshop Manual page 471

Is there any malfunction?
INSPECT EVAP SYSTEM LEAK DETECTION PUMP POWER
4
SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN
CIRCUIT
EVAP system leak detection pump connector is
disconnected.
Turn the ignition switch to the ON position (engine
off).
Measure the voltage between EVAP system leak
detection pump terminal A (wiring harness-side)
and body ground.
Is the voltage B+?
INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONTROL
5 CIRCUIT FOR SHORT TO GROUND
EVAP system leak detection pump connector is
disconnected.
Turn the ignition switch off.
Inspect for continuity between EVAP system leak
detection pump terminal D (wiring harness-side)
and body ground.
Is there continuity?
INSPECT EVAP SYSTEM LEAK DETECTION PUMP
6
Inspect the EVAP system leak detection pump.
(See EVAPORATIVE EMISSION (EVAP) SYSTEM
LEAK DETECTION PUMP INSPECTION
Is there any malfunction?
INSPECT PCM CONNECTOR FOR POOR CONNECTION
7
Turn the ignition switch off.
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Is there any malfunction?
INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONTROL
8
CIRCUIT FOR OPEN CIRCUIT
EVAP system leak detection pump and PCM
YesGo to the next step.
No Inspect the EVAP system leak detection pump related
fuse.
Go to Step 9.
YesIf the short to ground circuit could be detected:
If the short to ground circuit could not be detected:
Go to Step 9.
No Go to the next step.
YesReplace the EVAP system leak detection pump, then go to
Step 9.
(See
[13B-MSP].) REMOVAL/INSTALLATION
No Go to the next step.
YesRepair or replace the connector and/or terminals, then go
to Step 9.
No Go to the next step.
YesGo to the next step.
If the fuse is melt:
Repair or replace the
wiring harness for a
possible short to ground.
Replace the fuse.
If the fuse is deterioration:
Replace the fuse.
If the fuse is normal:
Repair or replace the
wiring harness for a
possible open circuit.
Repair or replace the wiring harness for a
possible short to ground.
Replace the PCM (short to ground in the
PCM internal circuit).
(See PCM REMOVAL/INSTALLATION
[13B-MSP].)
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
[13B-MSP].)