Question about 2001 Pontiac Montana
Just changed engine
Code 102 is for a problem with the mass air flow meter circuit.
The sensor is saying the air flow is very low.
Could be the sensor or a leak in the hose between the sensor and the intake.
Posted on Jan 16, 2013
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Posted on Jan 02, 2017
Most major Autoparts stores will get the Diagnostic codes from car computer and give you info on why light is on and what the problem is.
Posted on Jun 01, 2009
Without your actual trouble code, I am assuming that you are have a misfire on cylinder # 5. The computer cannot really tell what is causing the misfire only that cyl 5 is not putting out full power. If it misfires when cold then smooths out as it warms up, I would say it is probably an injector that is sticky, as it warms up it starts working properly.
Posted on Apr 29, 2010
Testimonial: "Thank you for your suggestion. I will have that checked out. I will also ask my mechanic what the actual trouble code says."
SOURCE: 2000 pontiac montana reads a
Sounds like EGR Valve (Exhuast Gas Recirculation Valve) is sticking in the open position allowing exhuast gas into the intake manifold to soon which at idle will cause the engine to either run real rough or to stall out.Some EGR valves can be taken off and clean the carbon out of it or you can replace it.
Posted on Apr 02, 2011
P0102 - Mass Air Flow (MAF) Circuit Low InputBasically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.
You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.
A code P0102 may mean that one or more of the following has happened:The MAF may be disconnected, or a wiring connection may be badThe MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF).The MAF sensor may be faultyThe vehicle computer may be faulty (very rare)
Possible Solutions:The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.Inspect for any air leaks near the MAF sensor.Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)Replace the MAF sensor.
P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.
A code P0135 may mean that one or more of the following has happened:O2 Heater element resistance is highInternal short or open in the heater elementO2 heater circuit wiring high resistanceopen or short to ground in the wiring harness
Possible SolutionsRepair short or open or high resistance in wiring harness or harness connectorsReplace oxygen sensor (cannot repair open or short that occurs internally to sensor)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)This code means that the heated circuit in the oxygen sensor on bank 1 decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0141. See also: P0135 (Bank 1, Sensor 1).
A code P0141 may mean that one or more of the following has happened:
open or short to ground in the wiring harnessO2 heater circuit wiring high resistanceO2 heater element resistance is highInternal 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 SolutionsReplace 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
P0443 - Evaporative Emission Control System Purge Control Valve CircuitThe Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.
P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it's also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a "whooshing" sound when the cap is removed, indicating a purge valve that isn't working at all or stuck closed.
To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
Bad purge solenoid (internal short or open)Wiring harness chafing or rubbing another component causing short or open on control circuitConnector worn, broken or shorted due to water intrusionDriver circuit inside powertrain control module (PCM) is badPossible Solutions
1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.
2. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn't click when you manually ground it, replace the purge solenoid.
3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.
Posted on Apr 04, 2012
Testimonial: "All of the above is good information. a very thorough job."
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