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Old 02-13-2004, 08:22 PM
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Ken00
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Join Date: Dec 2001
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Here you go, thanks for bumping it BTT dealford.

HW33 DTC P1445: CHECK PF SENSOR HIGH VOLTAGE TO PCM
Continuous Memory Diagnostic Trouble Code (DTC) P1445 indicates that Self-Test has detected a PF sensor circuit input above the maximum.

Possible causes:

PF shorted to VPWR.
PF open circuit.
PWR GND open circuit.
Damaged purge flow (PF) sensor.
Damaged PCM.
Disconnect PF sensor.
Check for loose pins or broken wires by pulling moderately on the PF and PWR GND circuits at PF sensor harness connector.
Repair as necessary.
Reconnect PF sensor.
Connect scan tool.
Key on, engine off.
Note: PF sensor input to the PCM range is 0.40 to 4.80 volts.

Access EVAPPF PID.
Key off.
Was EVAPPF PID voltage greater than 4.80 volts?
Yes No
GO to HW34 . Fault is an intermittent DTC P1445. GO to HW39 .

HW34 CHECK VPWR RESISTANCE FOR SHORT TO PF CIRCUIT IN PF SENSOR
Key off.
Disconnect PF sensor.
Allow the vehicle and PF sensor to cool down or warm up to a room temperature 13°C to 27°C (55° F to 80°F) before taking a resistance measurement on the PF sensor. This can take 15 to 20 minutes.
Measure resistance between VPWR and PF pins on the PF sensor.
Is resistance between 40 and 230 ohms?
Yes No
GO to HW35 . REPLACE damaged PF sensor. RESTORE vehicle. GO to HW42 .

HW35 CHECK PF SENSOR VOLTAGE INPUT TO PCM
Key on, engine off.
Measure PF circuit voltage at PF sensor harness connector to battery negative post.
Key off.
Was voltage greater than 10.5 volts?
Yes No
GO to HW36 . GO to HW37 .

HW36 CHECK PF CIRCUIT FOR SHORT TO VPWR IN HARNESS
Install breakout box, leave PCM disconnected.
Key on, engine off.
Measure resistance between PCM test pin 11 and PCM test pins 24 or 103.
Is the voltage greater than 10.5 volts?
Yes No
REPAIR short circuit. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. RERUN Quick Test . REPLACE damaged PCM. RESTORE vehicle. RERUN Quick Test .

HW37 CHECK PF CIRCUIT FOR OPEN IN HARNESS
Install breakout box, leave PCM disconnected.
Measure resistance of PF circuit between PCM test pin 11 and PF sensor harness connector.
Is the resistance less than 5.0 ohms?
Yes No
GO to HW38 . REPAIR open circuit. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. RERUN Quick Test .

HW38 CHECK PWR GND CIRCUIT FOR OPEN IN HARNESS
Measure resistance of PWR GND circuit between PCM test pin 24 or 103 and PF sensor harness connector.
Is the resistance less than 5.0 ohms?
Yes No
REPLACE damaged PCM. RESTORE vehicle. RERUN Quick Test . REPAIR open circuit. RESTORE vehicle. COMPLETE PCM Reset to clear DTCs. RERUN Quick Test .