O2 real time data for Bank 1 reading zero volts for both sensors - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 09-28-2010
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O2 real time data for Bank 1 reading zero volts for both sensors

Having issue with 99 XLT V6 4.0 Ranger.

Real-time reading taken via FuzzyCar Iphone app and PLX Kiwi WiFi

Codes:
P1131
P0174
P0000
P0000

Oxygen voltage: bank 1, sensor 1 = 0.000volts
Oxygen voltage: bank 1, sensor 2 = 0.000volts

Oxygen voltage: bank 2, sensor 1 = 0.800volts


With ignition in the on position but engine not running I verified that 12volt was supplied to both Bank 1 sensors: Reading 12.3volts

I then ran the engine till warm and shut down and check for O2 sensor voltage at the O2 sensor connector (sensor unplugged) sensor side:
Oxygen voltage: bank 1, sensor 1 = 0.700volts
Oxygen voltage: bank 1, sensor 2 = 0.760volts

Once the truck warms up the drivability goes down, Once I clear the codes will run OK till check engine light comes on.

The MAF has been replaced and Oxygen sensor: bank 1, sensor 1 was too but I swapped back the old one and reading are the same. Then verified continuity from the O2 sensor to the ECU, all lines read under 4.5 ohms on DMM.

Could a bad ECU be the cause of this? (Dead bank 1 circuit) If so what are the steps or options to verify a bad ECU. Can the ECU be removed and tested localy?
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Old 09-28-2010
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My brother was over with his 99 3.0 Ranger so I plugged the PLX Kiwi WiFi into his truck and sure enough the real-time readings were:
Oxygen voltage: bank 1, sensor 1 = 0.700volts
Oxygen voltage: bank 1, sensor 2 = 0.760volts

Oxygen voltage: bank 2, sensor 1 = 0.780volts
-----------------------------------------------------------

Hooked my battery back up on My 99 4.0 now showing voltage for bank 1 sensor 1 but nothing on bank1 sensor 2:
Oxygen voltage: bank 1, sensor 1 = 0.700volts
Oxygen voltage: bank 1, sensor 2 = 0.000volts

Oxygen voltage: bank 2, sensor 1 = 0.800volts

Nothing was done other that disconnecting the negative battery terminal to reset the computer then hooking it back up after fifteen minuets.

No vacuum leaks found (sprayed carb cleaner) around all vacuum lines and upper and lower intake manifold gaskets.

Still no idea as to how to test the Engine control computer, other than buying new one. Or taking ethe truck to dealer.
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Old 09-28-2010
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These look like "snapshot" voltages taken at one moment in time. If the 11 and 21 sensors are monitored continuously, their output voltages will generally be in a constant state of change with readings falling between 0 and 1 volt (except in open loop conditions such as heavy acceleration or immediately after a cold start). The voltage from the 12 sensor after the cat will also vary although its frequency of change is much lower than that of the 2 front sensors.

The chances of the PCM causing any problems with the sensor voltage are near zero.
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Old 09-28-2010
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I believe these are real-time, yes a snap shot but setting is 1sec intervals. I only listed the highest voltage seen, there is never any change in the 0.000 voltage on bank 1, sensor 2. I checked the voltage at the sensor and with the DMM (pin tip lead poking through wire insulation.I see voltages between 0.090 and 0.750volts

The only time the truck runs well is after disconnecting the negative battery terminal to reset the computer then hooking it back up after fifteen minuets.

Last edited by Green Ranger; 09-28-2010 at 07:13 PM.
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Old 09-30-2010
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After looking things over this afternoon, checking connections and tracing wiring. Still found nothing. But hooked the battery back up and was seeing:
Oxygen voltage: bank 1, sensor 1 = 0.750volts
Oxygen voltage: bank 1, sensor 2 = 0.700volts

Oxygen voltage: bank 2, sensor 1 = 0.750volts

Let the truck idle for 20 min with no issues so took it down the road. Driving ok but no power when really stepping down on the gas peddle, slow smooth acceleration was fine but nothing happening for a few seconds when gas pressed to the floor truck just bugged down and slowly picks put speed. On the highway tried hard acceleration and both bank 1 O2 sensors dropped to zero volts after letting up on the gas bank 1 sensor 1 came back to 0.0700 range but sensor 2 now read zero stayed that way for three miles and then check engine light came on! Think I will go rent a fuel pressure tester in the morning other that that running out of Ideas!
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Old 09-30-2010
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Fuel pressure was low reading jumping around between 28 and 35psi. Much lower that the 52 to 72 psi that the manual states. Was able to take electric fuel pump off of the boat and run it inline and got the pressure up to a steady reading of 42psi.

Took the truck for a drive runs a little better and now seeing a voltage reading on all the O2 sensors:
Oxygen voltage: bank 1, sensor 1 = 0.750volts
Oxygen voltage: bank 1, sensor 2 = 0.600volts

Oxygen voltage: bank 2, sensor 1 = 0.750volts.

The voltage for bank1 sensor2 drops and stays at zero when the gas pedal is touched. I had changed the fuel filter a little over over a month ago so look like I need to change the fuel sending unit.

Question why would bank1 sensor 1 (Driver side cylinders) not be doing the same as bank1 sensor 2 (passenger side cylinders)?
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Old 09-30-2010
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Quote:
Originally Posted by Green Ranger View Post
Question why would bank1 sensor 1 (Driver side cylinders) not be doing the same as bank1 sensor 2 (passenger side cylinders)?
Bank 1, Sensor 1 is passenger side, upsteam of cats, used for feedback fuel control
Bank 2, Sensor 1 is driver side, upsteam of cats, used for feedback fuel control

Bank 1, Sensor 2 is after the Y-pipe and some of the cats and is used primarily to judge the efficiency of the cats for OBDII. Despite its name, it monitors both PS and DS, not just PS (Bank 1).
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Old 09-30-2010
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Quote:
Originally Posted by rwenzing View Post
These look like "snapshot" voltages taken at one moment in time. If the 11 and 21 sensors are monitored continuously, their output voltages will generally be in a constant state of change with readings falling between 0 and 1 volt (except in open loop conditions such as heavy acceleration or immediately after a cold start). The voltage from the 12 sensor after the cat will also vary although its frequency of change is much lower than that of the 2 front sensors.

The chances of the PCM causing any problems with the sensor voltage are near zero.
excellent analysis!
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Old 10-02-2010
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Bad pressure reg on the fuel pump sending unit was cause. Replaced the fuel pump sending unit this morning and fuel pressure now steady reading of 65psi.

All voltage reading on O2 sensors are good:
Oxygen voltage: bank 1, sensor 1 = 0.750volts
Oxygen voltage: bank 1, sensor 2 = 0.680volts

Oxygen voltage: bank 2, sensor 1 = 0.750volts.

No codes after hour driving, much better throttle response.
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