Question about Generac Electrical Supplies

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Marty Leonard has a Centurion 15 model 004912 sn4083657. Problem with a no start condition. symptoms include: 1: no voltage signal to fuel solenoid 2: PCB (076009A rev F} LED display #1 red = off #2 yellow = on always #3 green = off I can crank engine manually after setting excercise switch. All fluids are correct (oil, coolant) 20 hours on hour meter any help or suggestions are welcome. Thanks

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Are any of these Fault indicators lit?

The faul lamp goes ON when one or more of the following
engine faults occurs and when engine shuts down.
• Low oil pressure
• Overcrank
• High coolant temperature
• Overspeed
• Low coolant level

Any ONE of the above being activated will will cause the no fuel to the engine. I realize you stated that all fluid levels were correct. That does not preclude one of the sensors passing a false signal causing your problem.

Each of the sensors provide a ground to the PCB that will preclude an engine start. You can disconnect them one at a time and retry a start sequence with the switch in Manual. If after disconnecting a sensor the unit starts and runs normally you have found the defective sensor.

I really believe that Mr. Marty Leonard has a fault sensor induced problem.

Thanks for choosing FixYa.

Kelly

Posted on Aug 21, 2010

  • 2 more comments 
  • Kelly
    Kelly Aug 22, 2010

    Let me just add that per the owner's manual: (pdf file page 8 para. 1.75)



    http://dl.owneriq.net/4/44448cca-0726-4e...



    all the LED indications you described are normal.



    The engine protective devices are on pages 7 and 8



    There are 2 fuses for the generator start / run sequencing. One 15 amp and one 7.5 amp. BOTH fuses must be functional for the generator to start and run. The 7.5 amp fuse is an "in-line" fuse.



    The first fuse in on the outside of the control panel (Black Cap)

    The second fuse is located inside the control panel just above the terminal board. (Fuse block holder)



    Thanks again for choosing FixYa.;



    Kelly

  • marty101143 Aug 22, 2010

    Kelly, I will check out the sensors and get back to you, lot of rain in Florida now, tomorrow will be better to work on the generator.
    Thanks for your input,
    Marty

  • Kelly
    Kelly Aug 23, 2010

    This Centurian Genset uses a GENERAC main board assy. Although this manual is mainly for RV's the troubleshooting procedures with a meter are nearly the exact same:



    http://www.gen-parts.com/Manuals/85680.pdf




    Page 121 has testing procedures for sensors. (Note they all operate on the premise of providing a ground. Hence my previous recomendation to disconnect them "one at a time" and try starting the unit EACH time in the manual mode.)



    I think this about the best I can do for you at the moment. If you need help just respond.... I will be watching for reponses. Mind you I am in the Philippines at this time so there is a huge time difference. Just would like to end with a success story here.



    Kelly

    Page 121 has testing procedures for sensors. (Note they all operate on the premise of providing a ground. Hence my previous recomendation to disconnect them "one at a time" and try starting the unit EACH time in the manual mode.)

    I think this about the best I can do for you at the moment. If you need help just respond.... I will be watching for reponses. Mind you I am in the Philippines at this time so there is a huge time difference. Just would like to end with a success story here.

    Kelly

  • Kelly
    Kelly Sep 02, 2010

    Marty, I am just doing a follow up. Your generator issue peaked my interest long ago and was wondering what you had found if anything. I am still willing to go the distance if you still need help.



    Kelly

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What does p0172 mean


Hey Mike , DTC P0172: Fuel Trim System Rich !
If the ECM detects an excessively rich condition, DTC P0172 sets.
Inspect for the following conditions:
?€¢
Vacuum hoses for splits, kinks, and improper connections


?€¢
The air duct for being collapsed or restricted


?€¢
The air filter for being dirty or restricted


?€¢
Objects blocking the throttle body


?€¢
Excessive fuel in the crankcase due to leaking fuel injectors--Refer to Fuel Injector Diagnosis .


?€¢
The evaporative emissions control system for improper operation


?€¢
Excessive fuel pressure--Refer to Fuel System Diagnosis .


?€¢
Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis .


?€¢
Fuel contamination--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .


?€¢
Fuel composition--Refer to Fuel Composition Diagnosis RPO LGD, VIN code W, E85 compatible engines only.


?€¢
The HO2S sensor 1 for improper installation and for electrical wires or connectors that may have contacted the exhaust system


?€¢
The HO2S sensor 1 signal circuit shorted to voltage


?€¢
Malfunctioning engine components--Refer to Symptoms - Engine Mechanical .

Mar 03, 2015 | 2008 Chevrolet Uplander

1 Answer

Two codes 1 po172 bank 1 running rich / 2 po300 missfire where to start ?


You could have leaking fuel injectors an fouled spark plugs causing the misfire ! I would pull the spark plugs out an see if wet with fuel . Could also have a leaking fuel pressure regulator ! How To Fix P0300 random misfire codes in your car

O2 Sensor Signal Fixed Rich http://youtu.be/H6lY42u19VM
The front oxygen sensor sends signals on exhaust gas oxygen content to the PCM to control a 14.7:1 air/fuel ratio under normal driving conditions. The PCM can make fuel corrections from a nominal 128 (0% correction) short/long term fuel trim value to a maximum window of 101-147 (-21 to +15 percent). If the PCM determines a rich condition exists, 02 voltage above 450 mV, it will decrease injector pulse width, reducing fuel, to maintain a 14.7:1 air/fuel ratio. The short term fuel trim value will be between 101-128 indicating a rich condition. If the PCM determines a lean condition exists, 02 voltage below 450 mV, it will increase injector pulse width, adding fuel, maintaining a correct air/fuel mixture. The short term fuel trim value will be between 128-147 indicating a lean condition. When certain conditions have been met to begin learning fuel control (ECT, closed loop, etc.) the PCM will use the short term fuel trim cell to update 1 of the 4 long term cells (idle, decel, cruise, accel) being used. During every drive cycle, or trip, the PCM will use and update the idle and cruise long term cells and will keep track of how long the control system is operating in these cells. After approximately 2 minutes of being in each of these cells, the fuel control system will enable EVAP purge and the purge long term cells will be used. Refer to EVAP Canister Purge for information on purge long term fuel cells. If the average of the idle and cruise fuel cells is 147 and the short term fuel trim cell is currently over 128, a lean fuel system DTC will set. This test is performed before the purge cells are used.
http://youtu.be/QDNrFcARMd0


Feb 07, 2015 | 1996 Saturn SL

3 Answers

Engine code p110


P0303 Code - Cylinder #3 Misfire
P0110 DTC - IAT Circuit Malfunction
P2195 O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 1) Code
Potential causes of a P2195 code include:
p2195
p219521
  • Oxygen (O2) or A/F ratio sensor or sensor heater malfunction
  • Open or short in O2 sensor circuit (wiring, harness)
  • Fuel pressure or fuel injector problem
  • Faulty PCM
  • Intake air or engine vacuum leaks
  • Faulty fuel injector(s)
  • Fuel pressure too high or too low
  • PCV system leak/fault
  • A/F sensor relay faulty
  • MAF sensor malfunction
  • ECT sensor malfunction
  • Fuel pressure too low
  • Fuel leak
  • Air suction in air intake system
  • A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • Potential causes of the P0110 DTC include:

  • po110
    • IAT sensor shifted out of airflow
    • Bad IAT sensor
    • Shorted to ground or open on signal circuit to IAT
    • Open in ground circuit to IAT
    • Poor connection at IAT (backed out terminals, broken connector locks, etc.)
    • Bad PCM

Sep 25, 2014 | 2003 Ford Focus

1 Answer

My car was overheating. ive put brand new water pump radiotor and thermostat in it. it seemed to not be overheating... the other day i was driving and the air conditionor and temp gauge both quit work


P0118 The engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set.
Potential Symptoms Symptoms of a P0118 could include:
  • Very poor fuel economy
  • A no start condition
  • Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
  • Illumination of MIL
P0341

Camshaft Position Sensor Circuit Range/Performance
What does that mean? This P0341 code basically means that the powertrain control module (PCM) detected a problem with the camshaft signal.
The camshaft position sensor (CPS) sends a specific signal to the PCM for Top Dead Center on the compression stroke as well as signals indicating the position of the cam sensor. This is accomplished through a reluctor wheel attached to the camshaft that passes by the cam sensor. Any time that the signal to the PCM is inconsistent with what the signal should be, this code is set. NOTE: this code can also be set by extended cranking periods.
Symptoms The car will likely run with this code set, as it is often intermittent and also because the PCM can often operate the vehicle in "limp-in/limp-home" mode even with a cam sensor signal problem. There may be no noticeable symptoms other than:

  • Poor fuel economy (if engine runs)
  • Possible no start condition

Jul 14, 2014 | 2001 Chevrolet Impala

1 Answer

P0107 gm code


What does that mean?

The Manifold Absolute Pressure (MAP) sensor responds to changes in the intake manifold pressure (vacuum). 5 Volts is supplied to the sensor from the PCM (powertrain control module). Inside the MAP sensor is a resistor that moves in relation to manifold pressure. The resistor varies the voltage between about 1 volt to 4.5 volts (depending on engine load) and that voltage signal is returned to the PCM to indicate manifold pressure (vacuum). This signal is essential for the PCM to determine fuel delivery. A P0107 DTC is set when the PCM sees that the MAP signal voltage is less than .25 volts which is too low.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Potential Symptoms

Anytime the MAP sensor signal is low the vehicle will likely have a very difficult time starting. Other symptoms may include:

  • Hard to start
  • Long cranking times
  • Sputtering/missing
  • Blowing black smoke
  • Poor fuel economy
  • Dies intermittently
  • MIL(Malfunction Indicator Lamp) illumination
Causes

The causes of a low MAP sensor signal circuit (P0107) could be any of the following:

  • Bad MAP sensor
  • Open or short in the signal circuit
  • Open or short in the 5 Volt reference circuit
  • Ground circuit open or shorted
  • Bad PCM

Jun 22, 2012 | 2008 Pontiac G6

1 Answer

Which codes (OBDI or II) do I use for my 1994 Jeep Grand cherokee laredo 4.0 2wd


before 1996 they use onboard diagnosis system for jeep.

when you turn on key you need to count check engine light blinks.

here are codes taken from internet.

11* No crank reference signal detected during engine cranking.
12* Direct battery input to PCM was disconnected within the last 50 key-on cycles.
13** No difference recognized between the engine MAP reading and the barometric (atmosphereic) pressure reading at start-up
14** MAP sensor input below minimum acceptable voltage.
or
MAP sensor input above maximum acceptable voltage.
15** No vehicle distance (speed) sensor signal detected during road load conditions.
17* Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
21** Neither rich nor lean condition detected from the oxygen sensor input.
or
Oxygen sensor input voltage maintained above the normal operating range.
22** Engine coolant temperature sensor input above maximum acceptable voltage.
or
Engine coolant temperature sensor input below minimum acceptable voltage.
23** Intake manifold air temperature sensor input above maximum acceptable voltage.
or
Intake manifold air temperature sensor input below minimum acceptable voltage.
24** Throttle position sensor input above maximum acceptable voltage.
or
Throttle position sensor input below minimum acceptable voltage.
25** A shorted condition detected in one or more of the idle air control motor circuits.
27* Injector #1 output driver does not respond properly to the control signal.
or
Injector #2 output driver does not respond properly to the control signal.
or
Injector #3 output driver does not respond properly to the control signal.
or
Injector #4 output driver does not respond properly to the control signal.
or
Injector #5 output driver does not respond properly to the control signal.
or
Injector #6 output driver does not respond properly to the control signal.
33* An open or shorted condition detected in the A/C clutch relay circuit.
34* An open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
or
Speed control switch input below the minimum acceptable voltage.
or
Speed control switch input above the maximum acceptable voltage.
35* An open or shorted condition detected in the radiator fan relay circuit.
41* An open or shorted condition detected in the generator field control circuit.
42* An open or shorted condition detected in the auto shutdown relay circuit.
44* An open or shorted condition exists in the engine coolant temperature sensor circuit or a problem exists in the PCM's battery temperature voltage circuit.
46** Battery voltage sense input above target charging voltage during engine operation.
47** Battery voltage sense input below target charging voltage during engine operation. Also, no significant change detected in battery voltage during active test of generator output.
51** Oxygen sensor signal input indicates lean air/fuel ratio condition during engine operation.
52** Oxygen sensor signal input indicates rich air/fuel ratio condition during engine operation.
53* PCM internal fault condition detected.
54* No fuel sync (camshaft signal) detected during engine cranking.
55* Completion of diagnostic trouble code display on the malfunction indicator lamp (check engine lamp).
62* Unsuccessful attempt to update SRI (service reminder indicator) miles in the PCM EEPROM.
63* Unsuccessful attempt to write to an EEPROM location by the PCM.

* - Check engine lamp will not illuminate at all times if this code was recorded. Cycle ignition key as described and observe code flashed by check engine lamp.

** - Check engine lamp will illuminate during engine operation if this code was recorded.

PCM = Powertrain Control Module (the engine computer)
MAP = Manifold Absolute Pressure (the sensor that measures how hard the engine is sucking air through the intake manifold
EEPROM = Electrically Erasable Programmable Read Only Memory (a type of computer chip used inside the PCM)

Nov 19, 2011 | 1994 Jeep Grand Cherokee

1 Answer

2007 Hyundai Entourage codes P2187, PP0174,P2189,P2195,P2270,P2272


I've come across these codes before. In almost every case there was an air leak in the intake air hose (hose between the engine air filter & the throttle body). Inspect this hose & tubes attached to it. This is especially true when the lean code includes the comment 'at idle'
P2187 - System too lean at idle Bank 1
P0174 - System too lean Bank 2
P2189 - System too lean at idle Bank 2
P2195 = HO2S Signal Biased/Stuck Lean (Bank 1 Sensor 1)
P2270 = HO2S Signal Stuck Lean (Bank 1 Sensor 2)
P2272 = HO2S Signal Stuck Lean (Bank 2 Sensor 2)

P2187 & P2189 = In order to provide the best possible combination of drivability, fuel economy and emission control, the PCM uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition

Aug 31, 2011 | 2008 Hyundai Entourage

2 Answers

Hello I hope you can help. My "service engine soon" light came on.I had trouble codes p0136 and p0304. We cleared the codes and the light has remained off, but the vehicle still runs poorly.My...


What does that mean? Essentially the same as P0137, a P0136 code refers to the second oxygen sensor on Bank 1. The O2 oxygen sensor produces a voltage between .1 mV and .9 mV. The ECM monitors O2 sensor voltage and determines if exhaust is lean or rich. O2 sensor voltage is high when exhaust is rich and low when exhaust is lean. The ECM monitors this voltage and increases or decreases fuel injector pulsewidth according to engine fuel/air ratio. If the ECM detects low HO2Sensor voltage for an extended period, it will set P0136 Conditions required to set: HO2 sensor voltage is low for longer than 2 minutes (minutes depend on model of vehicle. Could be up to 4 minutes)
Symptoms There may be no visible symptoms to the driver. Poor fuel mileage, possible misfire, depending on O2 sensor position when sticking.
Causes A code P0136 may mean that one or more of the following has happened:
  • Faulty O2 sensor leak in exhaust close to O2 sensor
  • Short to voltage on O2 signal circuit
  • Open in circuit resistance caused by corrosion in connector
Possible Solutions
  • Replace the second oxygen sensor on bank 1
  • Repair open or short in signal circuit
  • Clean corrosion from connector

A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.
Symptoms Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes A code P0304 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Replace the O2 sensor first and see if that helps clear the vehicle up some. Some times these codes will trigger other codes and these are the issues that you will get.

Jun 24, 2011 | Ford E-Series Cars & Trucks

1 Answer

What is nissan quest code p0138/p0139


P0138 - Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

P0139 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)

The Heated Oxygen Sensor (1 or 2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

Causes: A code P0138 may mean that one or more of the following has happened:
* Faulty O2 sensor
* Short to battery voltage in O2 sensor signal circuit
* High fuel pressure (not as likely)

Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate this answer).

Oct 11, 2010 | 2002 Nissan Quest

3 Answers

P0138 code


P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

Causes: A code P0138 may mean that one or more of the following has happened:
* Faulty O2 sensor
* Short to battery voltage in O2 sensor signal circuit
* High fuel pressure (not as likely)

Possible Solutions: Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate and comment this).

Sep 15, 2010 | 2002 Jeep Grand Cherokee

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