Question about 2005 Volkswagen Jetta

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Throttle body on jetta 4 2.0, I've replaced air flow meter, fuel pump, throttle body and temp switch, it's now reporting a fault saying signal to large.

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larry warren

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  • 318 Answers

Sounds like throttle body not fitted correctly or needs adjustment of idle sensor or idle speed control

Posted on Nov 15, 2012

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Anonymous

  • 34 Answers

SOURCE: 1990 Volkswagen Jetta GL Accelerator/Throttle sticking

i would replace the accelerator cable. After almost ten years im sure that wire encased by that plastic sheath has a lot of **** in it. Not letting the cable move freely inside of it.

Posted on Nov 20, 2008

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milespeed

  • 599 Answers

SOURCE: throttle body in 2001 Passat

throttle body is located at intake manifold ..follow snorkle from air cleaner to where it attaches to motor ..looses hose and clean with carb cleaner there..open blades(throttle) to get behind entry good also..... fuel filter is located in tank and in line from fuel tank just in front of tank inline with fuel line...good luck

Posted on Dec 16, 2008

Richard Delahant

  • 1201 Answers

SOURCE: vw golf 1.4 2002.diagnostic fault codes;4076 temp

The parts aren't really that expensive, it's the labor these places charge an hour. Call around and see who can do it the cheapest, unless you want to do it your self.

Posted on Jul 22, 2009

John Giles

  • 64 Answers

SOURCE: 97 Jetta Secondary Air Injection System Incorrect Flow

the air pump is located on the engine towards the front of the vehicle and has apx. 3/4 diameter pipes running to and from it. it is apx. 2 fists in size and it is black plastic. one of the lines on top of the air pump runs to the other side of the engine towards the firewall. at the other end of that pipe is the valve. disconnect that pipe while the vehicle is running. no air out of the pipe means bad pump. air coming out of the pipe means bad valve

Posted on Feb 13, 2011

dttech

dttech

  • 4803 Answers

SOURCE: VW Golf Mk4 1.4 16V AHW, backfires when cold. There were three broken wires, one goes to the EGR, one to the throttle body and one to the mass air flow. New throttle body, Coil pack and wires tested.

Aparently, a "full diagnostic" has NOT been done. If this statement were true, you would have found the cause of your problem.

With that said, backfiring is usually caused by damaged/leaking exhaust valves. Have you performed a compression test on this engine?

If the computer is "getting the wrong reading of the air/fuel mixture", then you should be getting oxygen sensor and/or fuel trim codes.

The coolant temp sensor does not cause the computer to get the wrong reading of the air/fuel mixture, it causes the computer to get the wrong reading of the engine coolant temperature. Although this will affect how much fuel the computer gives the engine, it does not cause it to get wrong readings of the mixture.

Just so you know, "diagnostics" consist of a WHOLE LOT more than hooking up a code reader and pulling codes from the engine computer.
People think that an automotive repair technician simply plugs in the "magic box" and replaces all the parts the "computer" tells him to replace...I WISH it were that simple!

Posted on Mar 18, 2012

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I have 99 bmw 323i.i ran it hot and got prob fixed and now the eml and a triangle with circle around it comes on dash and car has no power.feels like it has a rev limiter.wats wrong with my car


have throttle body checked also the MDK throttle motor,
make sure that the dealer has followed service bulletin 12 07 99 for procedure to replace the MDK throttle motor
also have them check for codes,here are some codes,
it could be an expensive job,have them check everything,it is most likely the throttle motor,,throttle body is 600 if they switch it,dont let them do it without checking throttle motor,
codes,
MS41, MS42 and MS43 engine DME bmw codes...
• 1 Ignition coil Cyl 2
• 2 Ignition coil Cyl 4
• 3 Ignition coil Cyl 6
• 5 Fuel injector Cyl 2
• 6 Fuel injector Cyl 1
• 8 Air Flow Meter (HFM)
• 10 Coolant Temperature Sensor
• 11 Tank Pressure Sensor (EVAP System) or Radiator Outlet Temp (MS43)
• 12 TPS or Plausibility - Maximum Coolant Temp (MS43)
• 13 Plausibility- Radiator Outlet Temp
• 14 Intake Air Temperature Sensor
• 15 Plausibility - Cut Out Time
• 16 AirCon Compressor - PWM Signal or Plausibility Intake Air Temp (MS43)
• 17 Plausibility - Engine Coolant Temp
• 18 EWS Signal or Camshaft Sensor (MS43)
• 19 Activation VANOS Inlet Valve or Exhaust Valve (MS43)
• 20 "CHECK ENGINE" Light Failure
• 21 VANOS -Electrical Fault or Activation VANOS Inlet Valve (MS43)
• 22 Fuel Injector Cyl 3
• 23 Fuel Injector Cyl 6
• 24 Fuel Injector Cyl 4
• 25 Lambda Sensor Heater -Bank 1
• 27 Idle Control Valve - Malfunction
• 29 Ignition Coil Cyl 1
• 30 Ignition Coil Cyl 3
• 31 Ignition Coil Cyl 5
• 33 Fuel Injector Cyl 5
• 35 Aux. Air Injection System Relay
• 36 DME Main Relay
• 37 DME Main Relay : Delay
• 38 Clutch Switch -Plausibility
• 39 Brake Light Switch or Brake Light Test Switch
• 40 Brake Light Switch or Pedal Value Signal
• 42 Multi Function Steering Wheel- Plausibility
• 43 Multi Function Steering Wheel: Button
• 45 Multi Function Steering Wheel: Port
• 47 Temp Sensor -Downstream of Pre-Cat or Torque Limitation Level 1 (MS43)
• 48 DME Control Unit -Self Test 1
• 49 DME Control Unit or Torque Monitoring Level 2 (MS43)
• 50 EVAP Control Valve or Response Monitoring Level 2 (MS43)
• 51 Shut-off Valve -Charcoal Filter or Request Control Unit Reset (MS43)
• 52 Solenoid Valve -Exhaust Flap
• 53 Idle Speed Actuator
• 55 Lambda Sensor Heater -Bank 2
• 56 Ignition Current Feedback Resistor - Open Circuit
• 57 Knock sensor -Bank 1
• 58 DME Control Unit -Self Test 2
• 59 Knock Sensor -Bank 2
• 61 Lambda Sensor Heater -Bank 2 Post Cat
• 62 Aux. Air Injection System -Switching Valve
• 63 DME Control Unit or Ambient Temp Signal via CAN (MS43)
• 64 Plausibility - Ambient Temperature
• 65 Camshaft Position Sensor (Inlet MS43)
• 66 DME Control Unit
• 67 DME Control Unit
• 68 Tank Venting Valve
• 69 Fuel Pump Relay
• 70 DME Control Unit
• 71 DME Control Unit
• 72 DME Control Unit
• 74 AirCon Compressor Relay
• 75 Lambda Sensor Voltage -Bank 1
• 76 Lambda Sensor Voltage -Bank 2
• 77 Lambda Sensor Voltage -Bank 1 Post Cat
• 78 Lambda Sensor Voltage -Bank 2 Post Cat
• 79 Lambda Sensor Heater -Bank 1 Post Cat
• 80 ABS/ASC interface
• 81 MSR Signal -Active too Long
• 82 ABS/ASC Interface -Advance Adjustment
• 83 Crankshaft Sensor
• 90 Exhaust Temperature Pre Cat Conv - Bank 1
• 91 Exhaust Temperature Pre Cat Conv - Bank 2
• 92 Exhaust Temperature Post Cat Conv -Bank 1
• 93 Exhaust Temperature Post Cat Conv -Bank 2
• 94 Auxiliary Air -Air Mass Flow Sensor
• 95 Auxiliary Air Valve or Auxiliary Air Hose Blocked
• 96 Auxiliary Air Pump - Function
• 97 Auxiliary Air -Flow Rate too Low
• 98 Auxiliary Air -Flow Rate too High
• 99 Auxiliary Air Valve Jammed Open
• 100 DME Control Unit -Self-Test Failed
• 103 VANOS Error -Inlet Camshaft
• 104 VANOS Error -Exhaust Camshaft
• 105 VANOS Error -Position Inlet Camshaft
• 106 VANOS Error -Position Exhaust Camshaft
• 109 Throttle Valve Plausibility
• 110 Pedal Sensor Value Potentiometer 1
• 111 Pedal Sensor Value Potentiometer 2
• 112 TPS Potentiometer 1
• 113 TPS Potentiometer 2
• 114 Throttle Valve Final Stage
• 115 Reference Voltage -Voltage Regulator 1 or Throttle Pedal Adaptation (MS43)
• 116 Reference Voltage -Voltage Regulator 2
• 117 Plausibility -Pedal Position Sensor 1/2
• 118 Plausibility -TPS 1/2 or TPS1/Airflow Plausibility (MS43)
• 119 Throttle Valve Sensor -Mechanical Error or TPS2/Airflow Plausibility (MS43)
• 120 Plausibility Pedal Sensor or TPS
• 122 Engine Oil Temperature
• 123 Map Cooling Thermostat Control
• 124 Activation DISA Solenoid
• 125 Activation Electric Fan
• 126 Activation Tank Leak Pump Solenoid
• 127 Activation Pump Solenoid
• 128 DME/EWS Communication
• 129 CAN Signal SMG 1
• 130 CAN Signal ASC -Timeout
• 131 CAN Signal Instrument Cluster -Timeout
• 132 CAN Signal Instrument Cluster -Timeout
• 133 CAN Signal ASC -Timeout
• 134 SMG Intervention -Plausibility
• 135 Throttle Valve Re-Adaptation Required
• 136 Throttle Valve -Spring Test and Limp-home Position Failed
• 137 CAN Signal -Steering Angle Sensor
• 139 CAN Signal -Tank Level Sensor
• 140 Tank Leak Pump Solenoid - Reed Switch Open or Output Stage (MS43)
• 141 Tank Leak Pump Solenoid - Reed Switch Stuck Closed or Tank Level Sensor (MS43)
• 142 Tank Leak Pump Solenoid - Reed Switch Stuck Open or DMTL Module (MS43)
• 143 Tank Ventilation or Tank Leakage (MS43)
• 144 Fuel System - Large Leak Recognised
• 145 Fuel System - Small Leak Recognised
• 146 EVAP System Leak Detected (Small Leak) or Pedal Sensor Supply Voltage Pot 1 (MS43)
• 147 Pedal Position Sensor Potentiometer Supply Channel 1 (Pot 2 MS43)
• 149 Air Flow Sensor or Pedal Value Sensor Mismatch
• 150 Lambda Post Cat Bank 1 Max Limit
• 151 Lambda Post Cat Bank 2 Max Limit
• 152 Lambda Post Cat Bank 1 Min Limit
• 153 Lambda Pre Cat Bank 2 Max Limit
• 154 Lambda Pre Cat Bank 2 Min Limit
• 155 Lambda Pre Cat Bank 2 No Signal
• 156 Lambda Pre Cat Bank 1 No Signal
• 157 Lambda Post Cat Bank 1 Min Limit
• 159 Lambda Post Cat Bank 2 Max Limit
• 160 Lambda Post Cat Bank 2 (MS41) or Throttle Valve Stuck
• 161 Throttle Valve - Stuck
• 162 Throttle Valve -Control Deviation
• 168 Pedal Position Sensor Pot Supply 1 or MAP Cooling Thermostat Jammed (MS43)
• 169 Throttle Valve Output Stage Cut off after Fault
• 170 DME Control Unit -Self Test Failed
• 171 Plausibility - Throttle Valve
• 172 Pedal Sensor Potentiometer 1/2 Short Circuit
• 173 TPS Potentiometer 1/2 Short Circuit
• 174 Throttle Valve Potentiometer 1/2 Adaptation
• 175 Pedal Sensor 1 Adaptation
• 176 Pedal Sensor 2 Adaptation
• 186 Voltage Post Cat Bank 1
• 187 Voltage Post Cat Bank 2
• 188 Voltage Pre Cat Bank 1
• 189 Voltage Pre Cat Bank 2
• 190 EVAP -Reed Switch Open or Voltage Post Cat Bank 1 (MS43)
• 191 EVAP -Reed Switch Closed or Voltage Post Cat Bank 2 (MS43)
• 192 EVAP -Reed Switch Open
• 193 EVAP -Check Hoses
• 194 EVAP -Large Leak Detected
• 195 EVAP -Small Leak Detected
• 196 EVAP -Electrical Valve from LDP Pump or Barometric Pressure Sensor (MS43)
• 197 EVAP -Barometric Pressure Sensor
• 198 Cat Efficiency during Start -Bank 1
• 199 Cat Efficiency during Start -Bank 2
• 200 Lambda Regulation Bank 1 Pre Cat
• 201 Lambda Regulation Bank 2 Pre Cat
• 202 Lambda Regulation Bank 1 Post Cat
• 203 Lambda Regulation Bank 2 Post cat
• 204 Idle Control System -Idle speed not plausible
• 208 EWS -RPM Signal Error
• 209 EWS -Message Error
• 210 Ignition Feedback Resistor (ZSR)
• 211 Idle Speed Actuator -Mechanical
• 212 VANOS Bank 1 -Mechanical
• 214 Vehicle Speed Signal (VSS)
• 215 Lambda Sensor Bank 1 or ASC/MSR/EML -Interface not plausible
• 216 Lambda Sensor Bank 2 or EGS Position Signal
• 217 CAN bus error -EGS Signal not present
• 218 CAN module -Warning
• 219 CAN module -CAN Offline
• 220 Lambda Voltage Range Bank 1 Sensor 1
• 221 Lambda Voltage Range Bank 2 Sensor 1
• 222 Low Coolant Temperature or Lambda Sensor Control (MS43)
• 223 Lambda Sensor Switching Bank 1 Sensor 2
• 224 Lambda Sensor Switching Bank 2 Sensor 2
• 225 Cat Efficiency Bank 1
• 226 Cat Efficiency Bank 2
• 227 Mixture Deviation Bank 1
• 228 Mixture Deviation Bank 2
• 229 Lambda Sensor Switching Bank 1
• 230 Lambda Sensor Switching Bank 2
• 231 Lambda Sensor Switching Bank 1 Pre Cat
• 232 Lambda Sensor Switching Bank 2 Pre Cat
• 233 Catalytic Converter Overall Efficiency Bank 1
• 234 Catalytic Converter Overall Efficiency Bank 2
• 235 Lambda Heater Bank 1 Post Cat or Pre Cat Signal (MS43)
• 236 Lambda Heater Bank 2 Post Cat or Pre Cat Signal (MS43)
• 238 Misfire Cyl 1
• 239 Misfire Cyl 2
• 240 Misfire Cyl 3
• 241 Misfire Cyl 4
• 242 Misfire Cyl 5
• 243 Misfire Cyl 6
• 244 Crankshaft Interval Timing
• 245 Aux Air Injection System Bank 1
• 246 Aux Air Injection System Bank 2
• 247 Aux Air Injection System -Incorrect Flow Detected
• 248 Pre Cat Converter Efficiency -Bank 1
• 249 Pre Cat Converter Efficiency -Bank 2
• 250 Tank Venting Valve -Function
• 251 Tank Ventilation Diagnosis Error
• 252 Tank Ventilation System Vacuum
• 253 Activated Charcoal Filter Shut-off Valve Stuck Shut
• 254 Tank Ventilation System -Large Air Leak
• 255 Tank Ventilation System -Valve Stuck Open

Apr 03, 2015 | 1999 BMW 323i

1 Answer

How does the air ratio work on a 2003 Dodge Neon 2.0 litre


Intake air flow meter and air intake temp sensor give ECU information; then coolant temp sensor has big influence on fuel mix, throttle position sender tells ECU what driver wants, then O2 sensor(s) do fine trim to fuel mix.

Jan 22, 2015 | 2003 Dodge Neon

3 Answers

I have a 98 jetta gls abs after it warms up it idles rough like rocking bacj and forth. When i pinch the fuel return line it gets better and the fuel pressure is at 30 psi. I work at goodyear and can't...


if pinching the fuel return line gives an improvement that there is not enough pressure at the injectors. This points to a fuel pressure regulator problem. Some are vacuum controlled so check that area first. Others may be electronic controlled so run fault codes to see if a fault has been recorded.

Dec 09, 2014 | 1998 Volkswagen Jetta

1 Answer

I repalce a TPS sensor twice could there be a false codes


it is possible that it is coming up with a tps fault but that may not be the prob at all that may be what the ecu reads as being out of ordinary range. one of the things that works with all efi vehicles is di electric grease it is for use on electrical terminals .it protects against corrosion and ensures a good contact . because im not sure which engine you are running ill give you a list of things to check that will work on the 4 cyl or v6 petrol engine. firstly check for vaccume leaks between the air flow meter and the throttle body. the air flow meter (afm) is just after the air cleaner box you will see a electrical connector that goes to it. if the vehicle has been fitted with LPG it is likely that it maybe damaged from the odd back fire in that case replacement is usually the only fix. there is a product out on the market that is made specifically for cleaning Air flow meters and id sudjest doing that as well as it being dirty will send the wrong reading to the ecu and it is responsible for letting the ecu know the volume of air entering the engine and the temp that it is , along with the coolant temp sensor it adjusts the fuel mixture eg richening up the fuel mixture until operating temp is achieved. the throttle body its self may also need to be cleaned with throttle body cleaner i do this manually with a rag and spray cleaner onto rag then with inlet trunking off hold in wide open position and continue to clean both sides of throttle butterfly as well as alloy housing. give these a go as iam unsure of the engine that you are running, but all of the above will work on both . the di electric grease I recommend to use on all electrical connections it cant hurt and ive seen it alone fix poor running problems. give all of the above and I hope it gives you some joy .

Aug 24, 2014 | 1999 Isuzu Rodeo

1 Answer

92 Camero SOMETIMES wont start, backfires or starts rough - but will run fine after it DOES start


I would want to know if it is ignition or fuel for sure. There are a few things you can try to narrow down the possible cause.
What does the cap and rotor look like, and is the spark a strong blue when it is running rough ?
Have you checked the actual fuel pressure with a gauge ? Does it matter if you spray carb cleaner or starting fluid into the throttle body ?
Any trouble codes stored in the computer ?
Its possible the coolant temp sensor is wrong and the computer thinks the air temp is 90 degrees instead of say 20 degrees. Or there is moisture in the dist cap or on the plug wires, and so on.

Feb 10, 2014 | Cars & Trucks

1 Answer

Engen problem and missing


Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression


Jan 18, 2014 | 2008 Toyota Corolla

1 Answer

93 toyota pickup DTC CODE 24,25,31


Dont clean your throttle body yet..........Theres an idle air control valve{ black round top about the size of a 50cent piece} on the back of the throttle body, cleaners will ruin it. It mounts with 2 screws facing the back of the motor. This is what controls your idle.........

Dec 11, 2012 | 1993 Toyota Pickup

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

2 Answers

2000 toyota corolla ve engine will run at idle but when you step on gas engine dies if you let off gas it stay running at idle got good fuel pressure good spark.i changed ecm changed fuel pump spark plugs...


Check the throttle cable to see if it's binding or catching on anything. If not, check the throttle body. If it's gummed up with carbon and not moving freely, you could be trying to add air that's simply not getting into the engine, while the computer throws a bunch of fuel in to match what it thinks it a ton of air.

Hope this helps.

Jul 10, 2009 | 2000 Toyota Corolla

1 Answer

2001 2.0 jetta manual tranny engine light on


Here are the test procedure for a PO171 code.

1. Check and verify there are no vacuum leaks or unmetered air leaks.

2. Check and verify air filter, all inlet screens and throttle body are clear and clean (never use an aerosol cleaner to clean a throttle body, damage to the throttle body electronics may result. Use a rag dampened with cleaner to wipe the throttle clean)

3. Check and verify fuel pressure is 36 PSI at idle with vacuum to the fuel pressure regulator.

4. Check Mass Airflow Sensor (MAF) Grams/Second (G/S) readings as follows:

Idle (about 830 RPM) 3.5 G/S or more (4 to 4.5 G/S preferred).

2500 RPM no load, 9 to 15 G/S (11 to 12 G/S preferred).

Wide Open Throttle (WOT) road load (drive vehicle at 45 MPH in 3rd gear and perform a WOT acceleration, observe maximum indicated MAF G/S readings) 90 or more G/S should be present, (prefer above 100 G/S).

A MAF that exhibits consistently lower than normal G/S readings can cause a P0171 code to set. Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 21, 2009 | 2001 Volkswagen Jetta TDI

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