Question about 2004 Chevrolet TrailBlazer

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My check engine lite is on, when i read the code it says my air pump is frozen and relay for it is shorted, is this hard to replace

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No two bolts and a plug in took me 30 mins becaus ei didn't know how to get at it but its simple remove teh air intake

Posted on Feb 16, 2011

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Related Questions:

1 Answer

Where is the secondary air injection pump/relay located


under the bracket in front of engine compartment, front

Jan 25, 2016 | 2002 Audi TT

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Where is the secondary air injection pump relay located on my 2002 audi tt roadster


The SAI pump itself fails, or the lines crack causing a leak and code P0411. The pump has a connector plug you can easily unplug.

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Secondary air injection pump not working. Checked voltage on it and got 2.81 volts. put 12 volts on it and pump worked


the air injection pump has a relay in the power distribution box that is controlled by the computer. it gets 12 volts when the relay is closed. the relay can be bad

Mar 29, 2015 | Lincoln Cars & Trucks

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Check engine light on secondary air pump not working. works with 12 volts but is it suppose to be less then 12 volts?


12 volts. there is a relay that supplies 12 volts to the pump when closed. this relay is in the power distribution box.

Mar 28, 2015 | Cars & Trucks

1 Answer

Code feul pressure sensor reads high


Did you plug all the connectors in all the way when you replaced fuel pump module ? Or pinch wires somewhere ?
P0453 - FTP Sensor Circuit High Voltage Detected The PCM monitors the EVAP control system FTP sensor input signal to the PCM. The test fails when the signal average jumps above a minimum allowable calibrated parameter.
  • FTP circuit open
  • VREF shorted to VPWR
  • Damaged PCM
  • FTP circuit shorted to VREF or VPWR
  • SIG RTN circuit open
  • Damaged FTP sensor
FTP V PID reading greater than 4.50 volts with key ON and engine OFF or during any engine operating mode indicates a hard fault. The third row are possabal causes for this code to set !
You pulled the fuel tank to replace the pump , right ? Probably just a bad connection ! Your going to have to pull it again !

Mar 09, 2015 | 2002 Ford Explorer

1 Answer

PO411 WHAT DOES THIS MEAN


Step 1:


What does tP0411 Secondary Air Injection System Incorrect Flow DetectedWhat does that mean? Secondary Air Injection is an emission control that uses an air pump (either electric or turned by the drive belt) to move fresh air into the exhausticon1.png manifold(s) or exhaust ports when the engine is in open loop and pre-catalytic converter when in closed loop. This reduces hydrocarbon emissions (HC), Carbon Monoxide (CO), and oxides of Nitrogen (NOx). This fresh air helps convert Carbon Monoxide (CO) into Carbon Dioxide (CO2) and Hydrocarbons (HC) into water vapor (H20).
A check valve is located in the air supply line to keep exhaust gasses from flowing into the pump. A cutoff valve that controls the airflow may be vacuum controlled or electrically controlled. When the powertrain control module (PCM) activates the valve, vacuum travels to the cutoff valve to open it and allow fresh air to flow. Some systems may have only a check valve and the flow may be regulated by a electromagnetic clutch on the air pump (similar to an A/C clutch).
Under hard acceleration, the air pump will be deactivated to prevent backfiring in the exhaust. To self-check, the AIR system will be activated by the PCM and fresh air would be routed into the exhaust system. The oxygen sensors would sense this fresh air as a lean condition and the short term fuelicon1.png trims would begin to move in the positive direction to compensate. The PCM expects to see this happen within just a few seconds during the self test. If it does not see the short term fuel trims rise, then the PCM interprets this as a malfunction in the AIR system and a code will be recorded.

Step 2:

Symptoms Symptoms of a P0411 DTC may include:
  • MIL (Malfunction Indicator Lamp) illumination
  • Backfiring in the exhaust under hard acceleration
  • Engineicon1.png running rich (This is counter-intuitive. See explanation below)
  • Squealing belt
Causes Potential causes of a P0411 code include:
  • Damaged or missing check valve
  • AIR pump intake port plugged/damaged
  • AIR pump clutch malfunction
  • Holes or damage to exhaust components

Step 3:

Possible Solutions If you have access to a scan tool, with KOEO (Key on engine off) command the AIR pump on. It should activate. If it doesn't, remove and inspect the AIR pump relay for discoloration/melting due to heat. Repair as necessary.
With the ignition on (engine off) check for battery voltage at the switched battery feed to the relay and the relay control circuit. If either of these isn't present, inspect circuit for blown fuse or open/short in the wiring. Repair cause of short and retest. If they are both present, jumper the battery feed to AIR pump feed circuit using a fused jumper. The pump should activate. If not, check for powericon1.png and ground present at the AIR pump when jumpered. If there is no voltage/ground present at pump repair open in wiring harness. If voltage and ground is present, but pump still does not run, suspect a bad AIR pump. If after jumpering the AIR pump feed circuit the pump activates then the problem is likely the AIR pump relay. Replace and retest.
If the scan tool activates the AIR pump, with KOER (Key on engine running) activate the AIR pump solenoid valve on and see if there is vacuum to the cutoff valve. It should have vacuum present to open the valve. If there is no vacuum present, check the AIR pump's vacuum solenoid valve for vacuum supply from the manifold. If there is vacuum present then the vacuum solenoid is likely bad. Replace it. If there is no vacuum present at the supply to the vacuum solenoid, check for a plugged or damaged vacuum line or plugged vacuum port. But if there is vacuum present at the cut-off valve, shut the engine off and using a vacuum pump, apply vacuum to the cut-off valve and see if it holds a vacuum and that air flows through it when vacuum is applied. If it doesn't hold vacuum or the valve doesn't flow when vacuum is applied, replace the cut-off valve. If the cut-off valve works properly, inspect the check valve for obstruction or to see if it's missing. Replace as necessary.
Check the steel line to the exhaust catalyst as well as the exhaust ports for damage or holes that could give a false reading.

Feb 19, 2013 | 2007 Buick LaCrosse CXL Sedan

1 Answer

Secondary air ignition malfuction


This code can set for more than the pump not running. It could be a sensor issue that reads it, too high of pressure, just to name a few.

Circuit/System Verification
Verify that DTC P0412, P0418, P2430-P2433, P2440, or P2444 are not set.
* If any of the DTCs are set, perform those diagnostics first.
Ignition ON, command the AIR Pump Relay ON and OFF with a scan tool. The AIR pump should turn ON and OFF.
* If the AIR pump does not turn ON or OFF, refer to Secondary Air Injection Pump Malfunction
Command the AIR Solenoid ON and OFF with a scan tool. The AIR solenoid valve should click with each command.
* If the AIR solenoid valve does operate as specified, refer to Secondary Air Injection Solenoid Valve Malfunction.
Engine running, command the AIR Pump Relay ON with a scan tool while observing the AIR Pressure Sensor parameter. The reading should be 15-20 kPa above the BARO reading.
* If less than the specified range, refer to Secondary Air Injection System Pressure Low.
* If greater than the specified range, refer to Secondary Air Injection System Pressure High.
Engine running, command the AIR System ON while observing the AIR Pressure Sensor parameter. The reading should be 7-10 kPa above BARO.
* If less than the specified range, refer to Secondary Air Injection System Pressure Low.
* If greater than the specified range, refer to Secondary Air Injection System Pressure High.
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
Secondary Air Injection Pump Malfunction

Ignition OFF, disconnect the AIR pump relay.
Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit terminal 87 and ground.
* If the test lamp illuminates, test the controlled output circuit for a short to voltage.
Verify that a test lamp illuminates between the AIR pump relay coil ignition circuit terminal 85 and ground.
* If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the AIR pump relay and/or the AIR solenoid relay.
Verify that a test lamp illuminates between the AIR pump relay switch B+ circuit terminal 30 and ground.
* If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the controlled output circuit for a short to ground.
Ignition OFF, disconnect the harness connector at the AIR pump.
Test for less than 2 ohms between the AIR pump ground circuit terminal B and ground.
* If greater than the specified range, test the ground circuit for an open/high resistance.
Connect the harness connector at the AIR pump.
Connect the J 36169-HD with a 60A fuse between the AIR pump relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. Verify the AIR pump is activated.
* If the AIR pump does not activate, test the controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the AIR pump.
Remove the J 36169-HD jumper wire.
Connect a test lamp between the AIR pump relay coil ignition circuit terminal 85 and the AIR pump relay control circuit terminal 86.
Ignition ON, command the AIR Pump Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
* If the test lamp is always ON, test the AIR pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM.
* If the test lamp is always OFF, test the AIR pump relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, replace the AIR pump relay.

Secondary Air Injection Solenoid Malfunction
Ignition OFF, disconnect the AIR solenoid relay.
Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit terminal 87 and ground.
* If the test lamp illuminates, test the controlled output circuit for a short to voltage.
Verify that a test lamp illuminates between the AIR solenoid relay coil ignition circuit terminal 86 and ground.
* If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the AIR solenoid relay and/or the AIR pump relay.
Verify that a test lamp illuminates between the AIR solenoid relay switch B+ circuit terminal 30 and ground.
* If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the controlled output circuit for a short to ground.
Ignition OFF, disconnect the harness connector at the AIR solenoid.
Test for less than 2 ohms between the AIR solenoid valve ground circuit terminal 4 and ground.
* If greater than the specified range, test the ground circuit for an open/high resistance.
Connect the harness connector at the secondary AIR solenoid.
Connect a 15A fused jumper wire between the AIR solenoid relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. Verify the AIR solenoid valve is activated.
* If the AIR solenoid valve does not activate, test the controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the AIR solenoid.
Remove the 15A fused jumper wire.
Connect a test lamp between the AIR solenoid relay coil ignition circuit terminal 86 and the relay coil control circuit terminal 85.
Ignition ON, command the AIR Solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
* If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
* If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
If all circuits test normal, replace the AIR solenoid relay.

Secondary Air Injection System Pressure Low
Engine running, inspect for exhaust leaks between the AIR solenoid valve and the catalytic converter.
* If an exhaust leak is detected, repair as necessary.
Ignition OFF, disconnect the AIR pump relay.
Engine running, connect the J 36169-HD with a 60A fuse between the AIR pump relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. Verify the AIR Pressure Sensor parameter is not 15-20 kPa above BARO.
* If 15-20 kPa above BARO, replace the AIR pump relay.
Ignition OFF, remove the J 36169-HD jumper wire and connect the AIR pump relay.
Remove the air inlet hose at the AIR pump.
Engine running, command the AIR System ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 7-10 kPa above BARO.
* If 7-10 kPa above BARO, the AIR pump inlet hose/pipe assembly is restricted. Remove the restriction or replace the hose/pipe assembly.
Ignition OFF, disconnect the hose at the AIR pump outlet.
Disconnect the hose at the AIR solenoid valve inlet.
Install a length of standard 1 inch I.D. (25.4 mm) hose from the AIR pump outlet to the AIR solenoid valve inlet.
Engine running, command the AIR System ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 7-10 kPa above BARO.
* If 7-10 kPa above BARO, test/inspect AIR pump outlet hoses/pipes for leaks or restrictions.
Test all AIR pump wiring and connections for less than 2 ohms. If the wiring and connections test normal and the hoses/pipes are OK, replace the AIR pump.

Secondary Air Injection System Pressure High
Ignition OFF, remove the AIR solenoid valve.
Connect the AIR pump outlet pipe/hose at the AIR solenoid valve.
Connect the AIR solenoid valve harness at the AIR solenoid valve.
Engine running, command the AIR system ON while observing the AIR Pressure Sensor parameter. The reading should be less than 11 kPa above BARO.
* If greater than the specified value, replace the AIR solenoid valve.
Inspect the AIR solenoid valve gaskets for proper alignment. If normal, test/inspect the AIR solenoid valve outlet pipe, exhaust manifold, and cylinder head for a restriction.

This issue and its repair may be under GM warranty. I think it would be worth your time to check at the dealer.

Hope helps.

Jan 06, 2012 | 2004 Buick Rainier

1 Answer

I have a 05 chevy trailblazer, the check engine lite is on and a hand held analyzer indicated problem codes: PO410 $ PO128 any ideas? Wayne C


P0410

Definition
Secondary Air Injection System fault
Explanation
The air injection system is monitored for faults
Probable Causes
1) Circuit relay defective or fuse open
2) Check connector and wiring
3) AIR pump defective or hoses blocked


P0128
Fault Code Definition
  • Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Common Problems That Trigger the P0128 Code
As for the po128 I would replace the thermostat first. That is the problem 99% of the time.

Good Luck

Jul 12, 2010 | Chevrolet Chevy Cars & Trucks

1 Answer

98 z28 air pump relay code comes up, replaced relay fuse, still blows fuse and chck eng lite still on


you need to have it hooked up to a computer and checked. and the brain needs reset. then the check engine light will go off. as for the air relay thats probably a naked ground wire touching somewhere in the motor. you need to find it and check. if not your air pump and breather needs to be changed.

Sep 30, 2009 | 1998 Chevrolet Camaro

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