ON-BOARD DIAGNOSTIC
DTC P1250
Except for GF4A-EL Models
DTC P1250 Pressure regulator control (PRC) valve circuit malfunction
DETECTION
CONDITION
PCM monitors PRC solenoid control signal at PCM terminal 95. If PCM turns PRC sorenoid valve on
and off but voltage at PCM terminal 95 does not change, PCM determines that PRC solenoid valve
circuit has malfunction.
POSSIBLE
CAUSE
PRC solenoid valve malfunction
Connector or terminal malfunction
Short to ground in wiring between PRC solenoid valve terminal B and PCM terminal 95
Open circuit in wiring between main relay terminal D and PRC solenoid valve terminal A
Open circuit in wiring between PRC solenoid valve terminal B and PCM terminal 95
PCM malfunction
FROM MAIN
RELAY
TERMINAL D
PCM
PRC SOLENOID VALVE
nrpn
PCM
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
.r Wi'IOM'l'i'I'l'!.
t-TT i l l i l I I I I H
X
i
HARNESS SIDE CONNECTOR
(VIEW FROM TERMINAL SIDE)
95
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
Service 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 N0.26 INTERMITTENT CONCERNS)
3
CLASSIFY OPEN CIRCUIT OR SHORT TO
GROUND MALFUNCTION
• Disconnect PRC solenoid valve tube that
connects to intake manifold.
• Connect vacuum pump to PRC solenoid
valve.
• Pump vacuum pump several times and stop
to pumps then wait a few seconds.
• Is vacuum maintained?
Yes Go to next step.
No Go to Step 5.
F1-68
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