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Old 12-03-2007, 01:07 AM   #1
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Default CELs i cannot figure out.. help?

OK, im slowly getting my car to the point where it can pass emissions. I got the other big electrical issue out of the way (thanks Ben!). But now im down to my last 2.

P0705- Transmission Range Sensor Circuit malfunction (PRNDL Input)

Umm, i have a 5spd. But i have used the search on m.net (about the only thing that site is good for). The only thing i have found is other people who have had it intermittantly. Some stuff points to a neutral safety switch. I tried looking where this is on the car, but failed. I have no idea what else it could be. Would it even effect my emissions inspection?

P1450- Some kind EVAP system code. The scanner was not specific about what it was (mfg code). I have read many different things, but no definate answer.

Any insight will be appreciated.
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Old 12-03-2007, 01:22 AM   #2
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This isn't your first odd tranny code, correct? Wonder if you have an auto ecu or something. That's a WAG
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Old 12-03-2007, 01:47 AM   #3
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Quote:
Originally Posted by DropTopDrifter View Post
Would it even effect my emissions inspection?
I don't know about GA, but in California the smog tech checks for codes, and any code means a fail.
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Old 12-03-2007, 03:10 PM   #4
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From a Ford Forum...and Ford and Mazda are intertwined...

P1450 - Unable to Bleed Up Fuel Tank Vacuum
Monitors the fuel vapor vacuum and pressure in the fuel tank. The system failure occurs when the EVAP running loss monitor detects excessive fuel tank vacuum with the engine running (but not at idle).

things to look for:
Blockages or kinks in EVAP canister tube or EVAP canister purge outlet tube (between fuel tank, EVAP canister purge valve and EVAP canister)
Fuel filler cap stuck closed (no vacuum relief)
Contaminated fuel vapor elbow on EVAP canister
Restricted EVAP canister
CV solenoid stuck open (partially or fully)
Plugged CV solenoid filter
EVAP canister purge valve stuck open
VREF circuit open (harness near FTP sensor, FTP sensor or PCM)
Damaged FTP sensor

The fuel filler cap looks like the easiest...

Barry
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Old 12-03-2007, 04:30 PM   #5
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Yeah, got similar ones... i actually stopped by a Mazda dealer and grabbed the service manual and copied the page directly, i got :

Detection Condition-
*PCM monitors FTP signal [Fuel Tank Pressure] when monitoring conditions are met. If vacuum is above -3.92kPa {-400mmAg, 15.7inHg}, PCM determines the vacuum is excessive.
--Monitoring Condition--
-IAT is above -10*C {14*F}
-ECT is 100*C {212*F}
-Vehicle speed is 99.6km/h {61.9 mph}
-ECT at engine start is below 35*c {95*F}

Diagnostic support note
*This is a continuous monitor (CCM)
*MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.
*PENDING CODE is available if PCM detects the above malfunction condition during first two drive cycles.
*DTC code is stored in PCM memory.
*FREEZE FRAME DATA is available.

Possible Cause
*CDCV malfunction
*Air filter clogged
*Charcoal canister malfunction
*Evaporative drain passage clogged
*FTP sensor malfunction
*Purge solenoid valve malfunction
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Old 12-03-2007, 04:43 PM   #6
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maybe your neat little electrical condition caused the FuelTankPressure (HA! That's what that stands for) to take a ****. Or maybe you need a gas cap. They're probably cheap enough to not be worth the drive, but I might have an extra one.
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Old 12-03-2007, 05:26 PM   #7
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my god i hope not..... that involves getting into the gas tank :(

I know i have 'topped off' the gas... maybe some got into the charcoal canister. I'll take it off tonight and see if i can conclude anything from it.


Im still clueless about the 705 too....i got under there and looked around and saw the sensor(s) are still connected, but i dont have a multi-meter to check the wires/sensors with.

Detection Condition-
*The PCM monitors changes in input voltage from the neutral switch. If PCM does not detect the PCM terminal 4H voltage does not change while the vehile speed is above 30 km/h or 18.6 mph and the clutch pedal is depressed above 14 times, it determines the the neutral switch circuit has a malfunction.

Diagnostics Support Note
*This is a continuous monitor (CCM)
*MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.
*PENDING CODE is available if PCM detects the above malfunction condition during first two drive cycles.
*DTC code is stored in PCM memory.

Possible Cause
*Neutral switch malfunction
*Open harness between neutral switch terminal A and PCM connector 4H
*short to power between neutral switch terminal A and PCM connector 4H
*Sort to GRND between neutral switch terminal A and PCM connector 4H
*Open harness between neutral switch terminal B and GRND
*Short to power between neutral switch terminal B and GRND
*PCM malfunction
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Old 12-03-2007, 07:57 PM   #8
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Does your code reader also check emissions readiness status ? If so how long after you clear the codes do the current ones come back ? I got passed emissions by clearing the codes and babying the car just long enough to get the status monitors to a cleared state (they all go to N/A or fail just after you clear codes and come back up as you drive). Just a thought.. There is such a thing as the OBD2 drive cycle but I found they will all go to pass within ~15 miles of normal city driving (no boost) and very easy on the pedal. You may get lucky and be able to get it to a passable state if the codes take a bit longer to show up. A shop that'll let ya call ahead and reserve a testing bay for ya is a good thing too. GL
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