Question about 1996 Chevrolet Tahoe

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Check engine light wont go off

I have a 5.7 350 vortec an the check engine light wont go off ive checked with code reader why check engine light was on an it said maf low voltage an also the cam position sensor.......we went ahead an changed the maf sensor twice an air temperature switch an the cam positon sensor...i have did a live test while the car was bring drivein an it was saying that no air at all was passing thru the MAF but everything else was running fine.....im just lost at this point

Posted by Anonymous on

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  • Expert
  • 81 Answers

Did you clear the codes after you replaced the maf, the cel should go off after 50 cycles (ignition being turned off and on)

Posted on Jun 11, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

emissionwiz
  • 74945 Answers

SOURCE: check egine light code p0102 map/maf is currently on and the car is running fine.

At this point you need to test the signal from the MAP to the PCM (powertrain control module), it should vary between about 1 and 4 volts as you throttle the engine up and down quickly, if little or no change then the heated wire in the MAF is burned out and th sensor will have to be replaced, in that case, they sell rebuilt units at a very reasonable cost, try rockauto.com, best prices around period.

Posted on Oct 10, 2008

  • 104 Answers

SOURCE: wont complete scan to pass emission test

When you rest your codes there is a series of tests your ECU has to go through before you can pass emissions. this is done some people can reset the code and go before its sets the code again. on the 96 you can have 2 tests not complete for it to pass. basicly you have to drive the car a couple days for the tests to pass.

check the readiness tests wait until only 2 have not passed. then you should be good.so drive and check.

Michael
ASE certified
PLZ rate.

Posted on Feb 09, 2009

wyatt1582
  • 453 Answers

SOURCE: lean bank 1

Check for a lower intake leak somewhere air is getting in on 1,2,3. Check for leaking vaccum hoses also.

Posted on Mar 26, 2009

Davaith
  • 56 Answers

SOURCE: 2000 chevy venture doesnt start

Not the IAC, or MAF, or 02

Does the Van Crank over?
Have you checked the IGN Relays? 1,2,and 3?
How did the Battery test out?
Anything below 11.9v battery is dead.
So I suggest that you do not throw any more parts and check the battery again.

Posted on Jul 15, 2009

  • 59 Answers

SOURCE: 2002 impala 3.8L 180,000kms. Having

it is possibly the throttle position sensor(tps) malfunctioning. basically the computer or "brain" of the car thinks the throttle is in a different position than it really is and automatically makes adjustments to fuel, air ect.... based on these false readings from the sensor thus causing the engine to react a little different when you expect to have power.

Posted on May 14, 2011

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3 Answers

1999 passat check engine light on and low idle


Best bet is to plug it into a code reader to see what the computer believes the problem to be. Only takes a few seconds and should be next to nothing in cost. Best guess is that the front O2 sensor in your air intake needs replacement. Other possibilities are clogged fuel filter or even worn out spark plugs. Need that code number to pin it down accurately.

Sep 11, 2014 | 1999 Volkswagen Passat

1 Answer

Can you tell me the location of code reader 1991 capri ?


1991 is pre-OBD2. code readers will not work.
sorry.
however, all is not lost. Many cars have an alternate way of reading codes from the computer.
Toyota has a block under the hood and you short couple wires together and count engine light flashes
Chrysler you can turn the ignition key on and off a few times and count engine light flashes
in your case for GMs from 1982 to 1995
1: find the 12 pin connector under the dash and short the upper two rightmost terminals.
with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.
2:. After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

Tech -- GM 2 Digit codes for 82 and up (non OBD-II)
code - code definition
12- diagnostic mode
13- 02 sensor or circuit
14- coolant sensor or circuit/ high temp indicated
15- coolant sensor or circuit/ low temp indicated
16- system voltage out of range
19- crankshaft position sensor or circuit
21- throttle position sensor or circuit- voltage high
22- throttle position sensor or circuit- voltage low
23- mixture control (m/c) solenoid or circuit (carbureted models)
23- manifold air temperature (mat) sensor or circuit (1990 and earlier models)
23- intake air temperature (iat) sensor circuit (fuel-injected models)
24- vehicle speed sensor (vss) or circuit
25- manifold air temperature (mat) sensor or circuit - high temperature indicated (1990 and earlier models)
25- intake air temperature (iat) sensor or circuit - high temperature indicated (1991 and later models)
26- quad driver module circuit
27- quad driver module circuit
28- quad driver module circuit
29- quad driver module circuit
31- park/neutral position (pnp) switch circuit
32- baro sensor or circuit (carbureted models)
32- egr circuit (fuel-injected models)
33- manifold absolute pressure (map sensor signal voltage high
33- mass air flow (maf) sensor or circuit - excessive airflow indicated
34- manifold absolute pressure (map) sensor signal voltage low 34- mass air flow (maf) sensor signal - low airflow indicated
35- idle speed control (isc) switch or circuit (shorted) (carbureted models)
35- idle air control (iac) valve/ circuit
38- brake switch circuit
39- torque converter clutch (tcc) circuit
41- no distributor signals to ecm, or faulty ignition module ( carbed models)
41- cylinders select error- mem-cal or ecm problem ( fuel-injected models
41- cam sensor circuit (3.8 engine)
42- bypass or electronic spark timing (est) circuit
43- low voltage at ecm terminal l (carbureted models)
43- knock sensor circuit
44- oxygen sensor or circuit - lean exhaust detected
45- oxygen sensor or circuit - rich exhaust detected
46- power steering pressure switch circuit
48- misfire diagnosis
51- prom, mem-cal or ecm problem
52- calpak or ecm problem
53- egr fault (carbureted models only)
53- system over-voltage (ecm over 17.7 volts)
54- mixture control (m/c) solenoid or circuit (carbureted models)
54- fuel pump circuit (1986 and later models)
55- oxygen sensor circuit or ecm
55- fuel lean monitor (2.2l engine)
61- oxygen sensor signal faulty (possible contaminated sensor)
62- transaxle gear switch signal circuits
63- manifold absolute pressure (map) sensor voltage high (low vacuum detected)
64- manifold absolute pressure (map) sensor voltage low (high vacuum detected)
66- pressure sensor or circuit air conditioning

May 20, 2014 | 2002 Subaru Forester

1 Answer

E150 hesitates under light throttle


Did it occur the MAF (will not set code) is defective or the fuel pressure is low?

Apr 08, 2014 | 2003 Ford E150

1 Answer

My 5.3l vortec will start with ether but wont stay running


Is your gas cap on tight? Could be low fuel pressure. Can you check your fuel pressure? Have you checked your fuel filter? You may need to replace the fuel pressure regulator. Locate it and pull vac hose off of it and if there is gas coming out of hose replace regulator. You will need to relieve pressure before changing.

Feb 12, 2012 | Cars & Trucks

1 Answer

Hi, I own a MB C230 Kompressor 1999 (123,ooo miles).Two days ago, check engine light came on. DTC was P0170 (fuel trim malfunction bank 1. I took out the MAF sensor and cleaned it using MAF sensor...


CODE PO170 - FUEL TRIM BANK 1 MALFUNCTION. POSSIBLE CAUSES TO YOUR PROBLEM. AIR LEAKS IN THE INTAKE MANIFOLD. EXHAUST PIPES OR EXHAUST MANIFOLD. FUEL CONTROL SENSOR IS OUT OF CALIBRATION ECT IAT MAF. LOW FUEL PUMP PRESSURE FUEL FILTER CLOGGED FUEL PRESSURE REGULATOR FAULTY. ONE OR MORE INJECTORS RESTRICTED OR FUEL PRESSURE REGULATOR FAILED. HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED.LOOK FOR VACUUM HOSE DISCONNECTED BROKEN LEAKING OR LOOSE.CHECK THE MASS AIR FLOW SENSOR SIGNAL CIRCUIT. SHOULD BE 4.8 - 5.2 VOLTS.IF SIGNAL CIRCUIT LOWER VOLTS LOOK FOR SHORT TO GROUND OR AN OPEN HIGH RESISTANCE IN CIRCUIT.IF YOU ARE 12 VOLTS FROM SIGNAL CIRCUIT PCM IS FAULTY.BEFORE SPENDING A LOT OF MONEY TAKE VECHICLE TO GARAGE OR DEALERSHIP.LET THEM TEST IAT AND MASS AIR FLOW SENSOR PARAMETER FOR THE CORRECT RANGE OR HZ USING A VARIABLE SIGNAL GENERATOR TO SEE IF IAT MAF SENSOR GOOD OR PCM FAULTY. THIS WAY YOU WONT SPEND TOO MUCH MONEY.

Jan 09, 2011 | Mercedes-Benz C230 Cars & Trucks

2 Answers

P0103 high voltage


the sensor is getting to much power test and check all power connections and lines for damage /grounding or corrosion

May 19, 2010 | 2000 Hyundai Accent

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MAP sensor output voltage too low?


poor start, very poor gas millage

Jul 31, 2009 | 1993 Mitsubishi Mirage

1 Answer

My check engine light came on. the code was po102. i have a 2000 vw beetle. any idea what this means? Thanks!



Trouble Code: P0102


MAF Sensor Circuit Low Input
Possible Causes:



Check for leaks between MAF sensor and throttle valve control module Voltage supply faulty. Sensor power circuit open from fuel pump relay to MAF sensor Sensor signal circuit open (may be disconnected) from ECM and MAF Faulty ground cable resistance between connector terminal 1 and Ground MAF Sensor malfunction Sure hope this helped you and good luck.

Jul 20, 2009 | 2000 Volkswagen Beetle

1 Answer

P1633 OBD II code 2001 Mercury Sable Wagon


p1633 is keep alive power voltage to low!! check voltage from alternator to battery, as well as all wires also.make sure battery terminals are not corroded. when car is running, voltage to battery should be 13.5 to14.5, when off voltage at battery should be 12.0 to 12.6,

Jun 08, 2009 | 1997 Mercury Sable

3 Answers

1997 suburban sevice engine light came on


insufficient switching bank 2 sensor 1 that mean the oxygen sensor on the passager side dont change voltage fast enought remove clean it or if it old change it hope it help FIXYA OUR POST thanks pierre

Jul 12, 2008 | 1997 Chevrolet Suburban

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