Download hx65 dtc p1451: check vpwr voltage to cv solenoid

HX65 DTC P1451: CHECK VPWR VOLTAGE TO CV SOLENOID
Diagnostic Trouble Code (DTC) P1451 indicates that Self-Test has detected a canister
vent (CV) solenoid circuit failure.
Possible causes:
 VPRW circuit open.
 CV circuit open.
 CV circuit shorted to PWR GND.
 CV circuit shorted to PWR.
 Damaged CV solenoid.
 Damaged PCM.
 Key off.
 Disconnect CV solenoid.
 Key on, engine off.
 Measure VPWR circuit voltage at CV solenoid harness connector.
 Key off.
Was voltage greater than 10.5 volts?
Yes
No
REPAIR open circuit. RESTORE vehicle.
COMPLETE PCM Reset to clear DTCs.
RERUN Quick Test .
GO to HX66 .
HX66 CHECK CV SOLENOID RESISTANCE
 Measure CV solenoid resistance.
Is resistance between 48 and 65 ohms?
Yes
GO to HX67 .
No
REPLACE damaged CV solenoid.
RESTORE vehicle. RERUN EVAP System
Leak Test at evaporative test port to
VERIFY the repair. PERFORM the Vehicle
Preparation for Monitor Repair Verification
Drive Cycle and RERUN EVAP Running
Loss Monitor Repair Verification Drive
Cycle (refer to Section 2A , Drive Cycles).
HX67 CHECK FOR OPEN CV CIRCUIT BETWEEN PCM AND CV SOLENOID
 Install breakout box, leave PCM disconnected.
 Measure resistance of CV circuit between PCM test pin 67 and CV solenoid harness
connector.
Is resistance less than 5.0 ohms?
Yes
No
REPAIR open circuit. RESTORE vehicle.
COMPLETE PCM Reset to clear DTCs.
RERUN Quick Test .
GO to HX68 .
HX68 CHECK CV CIRCUIT FOR SHORT TO PWR GND IN HARNESS
 Disconnect scan tool from DLC.
 Measure resistance between PCM test pin 67 and PCM test pins 51 and 103.
Are both resistances greater than 10,000 ohms?
Yes
RECONNECT scan tool. GO to HX69 .
No
REPAIR short circuit. RESTORE vehicle.
COMPLETE PCM Reset to clear DTCs.
RERUN Quick Test .
HX69 CHECK CV SIG CIRCUIT FOR SHORT TO PWR OR CHASSIS GND IN
HARNESS
 Key on, engine off.
 Measure voltage between PCM test pin 67 and chassis ground.
 Key off.
Was voltage less than 1.0 volt?
Yes
No
REPAIR short circuit to VPWR, VREF or
chassis ground. RESTORE vehicle.
COMPLETE PCM Reset to clear DTCs.
RERUN Quick Test .
GO to HX70 .
HX70 CHECK CV VOLTAGE SIGNAL FROM PCM
 Key off.
 Connect PCM to breakout box.
 Connect CV solenoid.
 Connect digital multimeter between PCM test pin 67 and PCM test pin 51 or 103.
 Start engine.
 Observe voltage on digital multimeter.
Is voltage between 10.0 and 14.0 volts?
Yes
No
REPLACE PCM. RESTORE vehicle.
RERUN Quick Test .
REPLACE damaged CV solenoid.
REMOVE breakout box. RESTORE vehicle.
COMPLETE PCM Reset to clear DTCs.
RERUN Quick Test .