Mazda 626 - DTC P0443 (Except for GF4 A-EL Models);Diagnostic Procedure

ON-BOARD DIAGNOSTIC
DTC P0443
Except for GF4A-EL Models
DTC P0443 Purge control solenoid valve circuit malfunction
DETECTION
CONDITION
• PCM monitors purge solenoid control signal at PCM terminal 67. If PCM turns purge solenoid valve on
and off but voltage at PCM terminal 67 does not change, PCM determines that purge solenoid valve
circuit has malfunction.
POSSIBLE
CAUSE
Purge solenoid valve malfunction
Connector or terminal malfunction
Short to ground in wiring between purge solenoid valve terminal B and PCM terminal 67
Open circuit in wiring between main relay terminal D and purge solenoid valve terminal A
Open circuit in wiring between purge solenoid valve terminal B and PCM terminal 67
PCM malfunction
FROM MAIN
RELAY
TERMINAL D
PCM
PURGE
SOLENOID
VALVE
A B
" ----- r
I J - l l
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
.67
PCM
X
X
g
m - i W M
ir iT n ï iV i1:1;1!1
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
Diagnostic procedure
STEP
INSPECTION ACTION
1
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available
Sen/ice Information.
• If vehicle is not repaired, then go to next step.
No Go to next step.
2 CLASSIFY INTERMITTENT CONCERN OR
CONTINUOUS CONCERN
• Turn ignition key to OFF then ON (Engine
OFF).
• Is same DTC present?
Yes
Go to next step.
No Refer to intermittent concern.
(See F1-142 No.26 INTERMITTENT CONCERNS)
3 CLASSIFY OPEN CIRCUIT OR SHORT TO
GROUND MALFUNCTION
• Disconnect purge solenoid valve tube that is
connected to intake manifold.
• Connect vacuum pump to purge solenoid
valve.
• Pump vacuum pump several times and stop.
• Wait a few seconds.
• Is vacuum maintained?
Yes Go to Step 5.
No Go to next step.
F1-64