Question about 2007 Chevrolet Tahoe

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I had a wiring harness problem underneath on one of the emissions sensors. I repaired the wires, but the Check Engine light is still on. Is there a way to reset this to determine if I have fixed the problem? I assume this would be a reset of the OBD II system.

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  • Chevrolet Master
  • 7,726 Answers

Yes, OBD II, but not really a reset--just clear the code. A scanner can do this, but I would give it a day or so to clear itself. Car car will run tests while you drive.

Posted on Sep 14, 2010

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Posted on Jan 02, 2017

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Evap System, 2003 Buick Century, PO446 , Engine light on


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How many wire harness clips connect to module besides the antenna


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Computer code P0340


OK. It sounds like you have an issue with the wire harness. Disconnect the sensor and with a multi meter check for voltage on the wires. You should get up to 4 volts. DO NOT TOUCH WIRES WITH A TEST LIGHT. This will fry the computer. follow the wire harness throughout the car looking for a damaged ares and repair it.

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2002 isuzu rodeo cylinder head torque lbs. for 2.2


Print


Removal & Installation

2.2L Engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2. Drain the cooling system.
  3. Relieve the fuel system pressure.
  4. Remove or disconnect the following: Negative battery cableIntake Air Temperature (IAT) sensor connectorPositive Crankcase Ventilation (PCV) valve and hoseAir intake assemblyUpper radiator hoseAccessory drive beltExhaust front pipeAlternator and bracketsCrankshaft Position (CKP) sensor connectorKnock sensor connectorHeater hosesWater bypass hoseFuel linesEvaporative Emissions (EVAP) valve connectorCanister hoseIntake manifoldEngine wiring harness connectors at left rear of the engine compartmentPower steering pump pressure switch connectorFront coverSpark plugs and wiresCamshaft Position (CMP) sensorValve coverTiming belt. Refer to the Timing Belt unit repair section.Timing belt idler pulleysTiming belt rear coverOil pressure switch connectorCamshaftsCylinder head. Remove the bolts in reverse of the tightening sequence.

    Negative battery cable Intake Air Temperature (IAT) sensor connector Positive Crankcase Ventilation (PCV) valve and hose Air intake assembly Upper radiator hose Accessory drive belt Exhaust front pipe Alternator and brackets Crankshaft Position (CKP) sensor connector Knock sensor connector Heater hoses Water bypass hose Fuel lines Evaporative Emissions (EVAP) valve connector Canister hose Intake manifold Engine wiring harness connectors at left rear of the engine compartment Power steering pump pressure switch connector Front cover Spark plugs and wires Camshaft Position (CMP) sensor Valve cover Timing belt. Refer to the Timing Belt unit repair section. Timing belt idler pulleys Timing belt rear cover Oil pressure switch connector Camshafts Cylinder head. Remove the bolts in reverse of the tightening sequence.

To install:


0996b43f802097a8.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Cylinder head torque sequence-2.2L (VIN D) engine

NOTE Use new cylinder head bolts for assembly.

  1. Install the cylinder head with a new gasket. Tighten the bolts in sequence as follows: Step 1: 18 ft. lbs. (25 Nm)Step 2: Plus 90 degreesStep 3: Plus 90 degreesStep 4: Plus 90 degrees
    1. Step 1: 18 ft. lbs. (25 Nm)
    2. Step 2: Plus 90 degrees
    3. Step 3: Plus 90 degrees
    4. Step 4: Plus 90 degrees

  2. Install or connect the following: CamshaftsOil pressure switch connectorTiming belt rear coverTiming belt idler pulleys. Tighten the bolts to 18 ft. lbs. (25 Nm).Timing beltValve coverCMP sensorSpark plugs and wiresFront coverPower steering pump pressure switch connectorEngine wiring harness connectors at left rear of the engine compartmentIntake manifoldCanister hoseEVAP valve connectorFuel linesWater bypass hoseHeater hosesKnock sensor connectorCKP sensor connectorAlternator and bracketsExhaust front pipeAccessory drive beltUpper radiator hoseAir intake assemblyPCV valve and hoseIAT sensor connectorNegative battery cable

    Camshafts Oil pressure switch connector Timing belt rear cover Timing belt idler pulleys. Tighten the bolts to 18 ft. lbs. (25 Nm). Timing belt Valve cover CMP sensor Spark plugs and wires Front cover Power steering pump pressure switch connector Engine wiring harness connectors at left rear of the engine compartment Intake manifold Canister hose EVAP valve connector Fuel lines Water bypass hose Heater hoses Knock sensor connector CKP sensor connector Alternator and brackets Exhaust front pipe Accessory drive belt Upper radiator hose Air intake assembly PCV valve and hose IAT sensor connector Negative battery cable
  3. Fill the cooling system.
  4. Start the engine and check for leaks.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2. Drain the cooling system.
  3. Relieve the fuel system pressure.
  4. Remove or disconnect the following:

    Negative battery cable Intake Air Temperature (IAT) sensor connector Positive Crankcase Ventilation (PCV) valve and hose Air intake assembly Upper radiator hose Accessory drive belt Exhaust front pipe Alternator and brackets Crankshaft Position (CKP) sensor connector Knock sensor connector Heater hoses Water bypass hose Fuel lines Evaporative Emissions (EVAP) valve connector Canister hose Intake manifold Engine wiring harness connectors at left rear of the engine compartment Power steering pump pressure switch connector Front cover Spark plugs and wires Camshaft Position (CMP) sensor Valve cover Timing belt. Refer to the Timing Belt procedure. Timing belt idler pulleys Timing belt rear cover Oil pressure switch connector Camshafts Cylinder head. Remove the bolts in reverse of the tightening sequence.

To install:

0996b43f802097a8.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Cylinder head torque sequence-2.2L (VIN D) engine


NOTE Use new cylinder head bolts for assembly.

  1. Install the cylinder head with a new gasket. Tighten the bolts in sequence as follows:
    1. Step 1: 18 ft. lbs. (25 Nm)
    2. Step 2: Plus 90 degrees
    3. Step 3: Plus 90 degrees
    4. Step 4: Plus 90 degrees

  2. Install or connect the following:

    Camshafts Oil pressure switch connector Timing belt rear cover Timing belt idler pulleys. Tighten the bolts to 18 ft. lbs. (25 Nm). Timing belt Valve cover CMP sensor Spark plugs and wires Front cover Power steering pump pressure switch connector Engine wiring harness connectors at left rear of the engine compartment Intake manifold Canister hose EVAP valve connector Fuel lines Water bypass hose Heater hoses Knock sensor connector CKP sensor connector Alternator and brackets Exhaust front pipe Accessory drive belt Upper radiator hose Air intake assembly PCV valve and hose IAT sensor connector Negative battery cable
  3. Fill the cooling system.
  4. Start the engine and check for leaks.

May 26, 2012 | Isuzu Rodeo Cars & Trucks

2 Answers

Wife Grand Caravan 2006 v-6 engine light just went on (on her way to the Emission center so she failed of course, Is it better to clean or replace and suggestion on repairing/replacing? ...


I suggest the following:
1. replace any and all O2 (oxygen) sensors. There should be two on this van. One is located behind the engine on the exhaust, and the second will be back under the passenger seat (undercarriage). It's wiring harness may be stored up under the floorbored, accessible from under the can; you will look for a rubber "gromet" the holds it in place. Pull this down and detach the wiring clip. With an O2 sensor socket (purchasable at auto parts dealer; or use an open end wrench) remove the sensor, insert new one, reconnect harness and replace gromet. The first one should be too hard to get to, and removal and installation is simpler; remove old one, after disconnecting wiring harness; put new one in; reconnect harness. Once this is done, disconnect the battery, reconnect, and start the van. If the light does not go off, (which it may not at first) drive the van around for a day or two, disconnect battery again, reconnect and the light should go off. If not, got to an auto parts dealer and ask to have the codes reset. This will also cause the light to go off. Even if the light comes back on, it doesn't necessarily mean something crucial is wrong.
2. Replace both the EGR Valve, and the PCV valve. These both are invloved in the recirculation of emissions (exhaust send to the intake to be reburned before being exhausted).
3. Before returning to DMV, make sure you have driven the van long enough for the engine to be at normal operation temperature. If the van engine is close to cold, it will not pass, regardless of how new or nold any emission parts are - this is because the engine has to be "hot" to be able to burn re-circulated emissions correctly. If it does not pass again, explain to them the parts you've replaced, and ask them for any suggestions as well as to what else may need replaced (other parts or a bit more expensive, such as the catalytic converter, the main part that "filters" the re-burned exhaust before entering the muffler. A basic tune up: plugs, wires, distributor cap and rotor (if equipped) will help with this as well; as well as changing the air and fuel filter.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com

Feb 28, 2011 | 2005 Dodge Caravan

1 Answer

How to replace cam sensor


This unit is part of the distributor.




OPERATION


See Figure 1
The ECM uses the camshaft signal to determine the position of the No. 1 cylinder piston during its power stroke. The signal is used by the ECM to calculate fuel injection mode of operation.
If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.



0900c1528008f0d2.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Camshaft Position (CMP) sensor location


TESTING


See Figure 2



0900c1528008f0d3.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Camshaft Position (CMP) sensor wiring schematic

  1. Disconnect the CMP sensor wiring harness and connect an LED test light between CMP harness terminal C and battery ground.
  2. With the ignition ON and the engine off, verify that the test light illuminates.
  3. If not as specified, repair or replace the fuse and/or wiring.
  4. Carefully connect the test light between CMP harness terminal A and C and verify that the test light illuminates.
  5. If not as specified, repair the CMP harness ground circuit (terminal A).
  6. Turn the ignition OFF and disconnect the test light.
  7. Next, connect suitable jumper wires between the CMP sensor and CMP sensor harness. Connect a DC volt meter to the jumper wire corresponding to CMP terminal B and battery ground.
  8. Start the engine and verify that the voltage signal is 5-7 volts.
  9. If it is not as specified, the CMP sensor may be faulty.


REMOVAL & INSTALLATION


  1. Disconnect the negative battery cable.
  2. Detach the sensor harness connector at the sensor.
  3. Unfasten the retaining bolt, then remove the sensor from the camshaft housing. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.

To install:
  1. Lubricate the O-ring with clean engine oil, then place on the sensor. Install the sensor into the camshaft housing.
  2. Install the CMP sensor retaining bolt, then tighten to 88 inch lbs. (10 Nm).
  3. Attach the sensor harness connector.
  4. Connect the negative battery cable.

Feb 15, 2011 | 1996 Chevrolet C1500

3 Answers

What does code p1391 mean when failing an emissions test


intermittent loss of crankshaft or camshaft position sensor.

Oct 14, 2009 | 1997 Dodge Ram 1500 Club Cab

1 Answer

WHAT TO DO ABOUT TROUBLE CODES PO449 & PO141 ON 01 VENTURE


code is P0449

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Definition:
EVAP (Evaporative Emission System) purge/vent solenoid circuit condition

Explanation:
The solenoids and system wiring are monitored for opens or shorts

Probable Causes
1- Purge or vent solenoids defective
2- Check connevtor and wiring
3- Fuel saturated vapor canister
4- Failed EVAP vent solenoid


A code P0141 may mean that one or more of the following has happened:
  • open or short to ground in the wiring harness
  • O2 heater circuit wiring high resistance
  • O2 heater element resistance is high
  • Internal short or open in the heater element
Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.
Possible Solutions
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
  • Repair short or open or high resistance in wiring harness or harness connectors

Oct 10, 2009 | 2001 Chevrolet Venture

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