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  #1  
Old 05-17-2010, 07:15 PM
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Default I am new here with a service engine soon light

I just joined a few days ago after buying a 97 z-28 convertable. today my service engine soon light came on. i scannered the code its po441 what is it and what do i need to do to fix it. here is a pic of the new ride
thanks wilsClick the image to open in full size.
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  #2  
Old 05-17-2010, 07:20 PM
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nice looking ride. those rims look really good IMO.

here a quick google search brought this up.

This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.




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Symptoms

Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.
Causes

A code P0441 could mean one or more of the following has happened:
  • <LI itxtvisited="1">Bad vacuum switch <LI itxtvisited="1">Broken or damaged EVAP line or canister <LI itxtvisited="1">Open in PCM purge command circuit <LI itxtvisited="1">Open or short in Voltage feed circuit to Purge Solenoid <LI itxtvisited="1">Faulty purge solenoid <LI itxtvisited="1">Restriction in EVAP solenoid, line or canister <LI itxtvisited="1">Corrosion or resistance in purge connector
  • Bad PCM
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  #3  
Old 05-17-2010, 07:31 PM
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more info here.
Testing the EVAP System
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93 z28, 4 bolt block,le2 heads,le intake,58mm bbk,223/230 565/565 112,cc 1.6 rr,moroso cai & 5.5 oil pan, kooks headers&cated y,corsa cat back,patc raptor level 3 trany,2000 stall 2.5x converter&trans cooler,30# red top injectors,lt1pcmtuning tune, koni double adj, spohns 9in moser rearend, tunnel brace torque arm, shock tower brace, panhard bar, rear lower control arms, subframe connectors & hp driveline.
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Old 05-17-2010, 07:42 PM
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Thanks craby
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  #5  
Old 05-17-2010, 07:52 PM
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Oh you mean P0441:


Document ID# 22487
1997 Chevrolet/Geo Camaro
DTC P0441 Evaporative Emission (EVAP) System No Flow During Purge

Object Number: 21645 Size: MF
Click here for detailed picture of above image.
Circuit Description

The EVAP vacuum switch is a normally closed switch connected to ground, mounted in the vacuum line between the EVAP canister and the EVAP solenoid. 12 volts is supplied to the switch through a pull-up resistor in the PCM. When the PCM commands the EVAP canister purge solenoid valve open (purge ON) and engine vacuum draws the evaporative emissions from the canister, the EVAP vacuum switch opens (signal voltage high) providing feedback to the PCM that the EVAP system is operating. When the PCM commands purge OFF, the EVAP vacuum switch closes (signal voltage low) confirming purging has ceased.
Conditions for Setting the DTC

* DTCs P0100, P0101, P0102, P0103, P0106, P0323, P0325, P0327, P0332, P0335, P0336, P0372, P0400, P0403, P0410, P0412, P0420, P0430,P0441, P0443, P0500, P0502, P0503, P0506, P0507, P0530, P0531, P0719, P0758, P1415, P1642, P1652 not set.
* ECT less than 115C (239F)
* IAT greater than 3C (37F)
* Engine speed between 800 and 3000 RPM
* TP Angle between 2% and 50%
* MAP between 33 and 77 kPa
* BARO greater than 77 kPa
* Purge duty cycle above 60%
* The PCM detects low signal voltage on the EVAP vacuum switch signal circuit when the PCM is commanding purge ON.
* Fault present for 5 seconds

Action Taken When the DTC Sets

* The PCM will illuminate the Malfunction Indicator Lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.
* The PCM will record operating conditions at the time the diagnostic fails. The first time the diagnostic fails, this information will be stored in Failure Records. If the diagnostic reports a failure on the second consecutive drive trip, the operating conditions at the time of failure will be written to Freeze Frame and the Failure record will be updated.

Conditions for Clearing the MIL/DTC

* The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
* A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
* A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* PCM battery voltage is interrupted.
* Using a Scan tool.

Diagnostic Aids

Before replacing any components, visually/physically check for the following:

* Mis-routed harness.
* Rubbed through wire insulation.
* Broken wire inside the insulation.
* Kinked or damaged vacuum hoses.
* Physically damaged system components.
* Inspect components and vacuum lines for traces of carbon or other contaminants. The presence of foreign material may be causing a restriction in the system or preventing the solenoid valve from closing properly. Either condition may cause a DTC to set.

For intermittents, refer to Symptoms .
Test Description

Number(s) below refer to step numbers on the diagnostic table.

2.

DTC P0443 indicates that the purge control solenoid may not be operating correctly. This condition must be corrected first.

Step


Action


Value(s)


Yes


No

1


Was the Powertrain On-Board Diagnostic (OBD) System Check performed?


--


Go to Step 2


Go to Powertrain On Board Diagnostic (OBD) System Check

2


Important

If DTC P0443 is set, refer to that DTC first.

1. Turn the ignition ON, engine OFF.
2. Using the scan tool, check the EVAP vacuum switch status.

Does the scan tool indicate the EVAP vacuum switch has No Purge?


--


Go to Step 3


Go to Step 5

3


1. Start the engine.
2. Using the scan tool, command the EVAP canister purge solenoid valve ON while observing the EVAP vacuum switch status.

Does the scan tool indicate Purge when the solenoid is commanded ON?


--


Go to Diagnostic Aids


Go to Step 4

4


1. Turn the engine OFF.
2. Disconnect the purge hose from the EVAP vacuum switch (the vacuum line from the canister).
3. Connect a vacuum gauge to the canister side of the EVAP switch.
4. Start the engine.
5. Using the scan tool, command the EVAP canister purge solenoid valve ON while observing the vacuum gauge.

Does the vacuum gauge indicate close to normal engine vacuum when the solenoid is commanded ON?


--


Go to Step 5


Go to Step 7

5


Disconnect the EVAP vacuum switch harness connector.

Does the scan tool indicate Purge?


--


Go to Step 9


Go to Step 6

6


1. Turn the ignition OFF.
2. Disconnect the PCM connector C2.
3. Using DVM J 39200, check for continuity between the EVAP vacuum switch signal circuit and ground.

Does the DVM indicate infinite resistance?


--


Go to Step 10


Go to Step 12

7


Disconnect the vacuum harness from the EVAP canister purge solenoid valve and connect a vacuum gauge to the manifold side of the vacuum harness.

Is normal manifold vacuum indicated?


--


Go to Step 8


Go to Step 13

8


1. Rotate the vacuum harness connector enough to reconnect only the manifold vacuum supply hose to the solenoid valve.
2. Connect the vacuum gauge to the other port on the solenoid valve.
3. Using the scan tool, command the EVAP canister purge solenoid valve ON while observing the vacuum gauge.

Is vacuum indicated when the EVAP canister purge solenoid valve is ON?


--


Go to Step 14


Go to Step 15

9


Replace EVAP vacuum switch, refer to Evaporative Emission (EVAP) Purge Vacuum Switch Replacement . Refer to Evaporative Emission (EVAP) System Cleaning for cleaning procedure of EVAP system before replacing the EVAP vacuum switch.

Is the action complete?


--


Go to Step 16


--

10


Check connections at the PCM.

Was a problem found and corrected?


--


Go to Step 16


--

11


Important:

Replacement PCM must be programmed. Refer to PCM Replacement/Programming .

Replace the PCM.

Is the action complete?


--


Go to Step 16


--

12


Repair signal circuit shorted to ground.

Is the action complete?


--


Go to Step 16


--

13


Check for the following conditions:

* Blocked or restricted manifold vacuum port.
* Restricted, kinked or leaking hose between the EVAP solenoid and the intake manifold, Refer to Evaporative Emission (EVAP) System Cleaning for cleaning procedure of EVAP system.

Was a problem found and corrected?


--


Go to Step 16


Go to Step 14

14


Repair restricted, kinked or leaking hose between the EVAP solenoid and the EVAP vacuum switch, Refer to Evaporative Emission (EVAP) System Cleaning for cleaning procedure of EVAP system.

Is the action complete?


--


Go to Step 16


--

15


Replace the EVAP solenoid, refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement . Refer to Evaporative Emission (EVAP) System Cleaning for cleaning procedure of EVAP system before replacing the EVAP solenoid.

Is the action complete?


--


Go to Step 16


--

16


1. Using the scan tool, select DTC, Clear Info.
2. Start the engine and idle at normal operating temperature.
3. Select DTC, Specific, then enter the DTC number which was set.
4. Operate the vehicle within the conditions for setting this DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?


--


Go to Step 17


Go to Step 2

17


Using the scan tool, select Capture Info, Review Info.

Are any DTCs displayed that have not been diagnosed?


--


Go to the applicable DTC table


System OK
Document ID# 22487
1997 Chevrolet/Geo Camaro
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Old 05-17-2010, 07:52 PM
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1997, air, camaro, canister, check, cold, engine, failed, install, intake, light, p0327p0332, p1415, purge, sirvice, solenoid, symptoms

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