Code PO410 and co2 sensors

Tiny
MUSICMAN08
  • MEMBER
  • 2004 ISUZU ASCENDER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 137,500 MILES
Hi, I just purchased this vehicle. It had a check engine code po410 and replaced all the parts, secondary air supply, secondary valve, relay, and two co2 sensors. The check engine light came on again for the ninth time. Any ideas?
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Thursday, September 13th, 2018 AT 1:32 PM

9 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon.

Did anyone check to see if any of those parts were defective? A lot of money spent with no results.

One of the common issues is the passages in the head get carboned up and it cuts down the volume of air from the air pump. I would start there. It may be that simple.

Also, do you hear the pump activate when it is first started in the morning?

Roy

DTC P0410

Circuit Description
The secondary air injection (AIR) system is designed to reduce exhaust emissions after initial engine start-up. This occurs when coolant start up temperature and intake air temperature (IAT) are at the conditions listed below. The AIR pump will operate for less than 25 seconds. The powertrain control module (PCM) commands the AIR system ON by simultaneously supplying a ground to the AIR pump relay and the AIR solenoid relay. When commanded ON the AIR pump forces fresh air through the electronic shut-off valve and into the exhaust manifold, accelerating catalyst operation. When the AIR system is inactive, the electronic shut-off valve prevents airflow in both directions. The PCM will run the AIR diagnostic passive test only on ignition cycles when the pump is commanded ON. If this test passes, then no active test will run. If the passive test fails, or is inconclusive, the active test will run later in the ignition cycle. At that time the PCM runs a maximum of two 3 second active tests, monitoring the heated oxygen sensor (HO2S) 1 voltage, expecting a drop below 150 mV. When the PCM detects an insufficient HO2S 1 response, DTC P0410 will set.

Conditions for Running the DTC
- DTCs P0105, P0107, P0108, P0112, P0113, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0171, P0172, P0300, P0301-P0304, P0341, P0506, P0507, P0601, P0602 are not set.
- The AIR system is commanded ON for more than 20 seconds.
- The IAT is between 1-151 C (32-302 F).
- The engine coolant temperature (ECT) is between 5-1 14 C (41-230 F).
- The start up ECT is between 3-50 C (37-122 F).
- The battery voltage is more than 11 volts.
- The engine run time is more than 200 seconds.
- The vehicle is operating in fuel trim cells 16 or 17.
- The throttle position (TP) change is less than 5 percent.
- The manifold absolute pressure (MAP) is less than 30 kPa.
- The engine speed is more than 1,150 RPM.

Conditions for Setting the DTC
The HO2S voltage parameter does not decrease to less than 150 mV for 1 second during a 3 second active test, for 2 consecutive active tests.

Action Taken When the DTC Sets
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
- An intermittent may be caused by any of the following conditions:
- Low system airflow
- Excessive exhaust system back-pressure
- Pinched, restricted, split, or damaged pipes/hoses
- Restrictions in the AIR pump inlet hose
- Pitted contacts in the AIR pump relay, AIR solenoid relay-Tap on the AIR pump relay or AIR solenoid relay to attempt to duplicate an intermittent condition.
- Heat damage to the AIR outlet hose may indicate an shut-off valve failure
- Yellow tinted water in the AIR pump may indicate an shut-off valve failure
- Water or debris ingested into the AIR pump
- Observe the Freeze Frame/Failure Records to aid in conditions of setting DTC P0410.
- Thoroughly inspect any circuits that are suspected of causing the intermittent condition. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.
- If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
9 This step determines if excessive resistance on the supply voltage circuit between the AIR fuse and the AIR pump relay is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
13 This step determines if excessive resistance on the AIR pump relay circuit and PCM driver is the cause for an inoperative AIR pump relay. The test lamp in series is intended to generate a electrical load on this circuit. 90 ohms of resistance on this circuit can prevent the AIR pump relay from operating.
17 This step determines if excessive resistance on the supply circuit is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
18 This step determines if excessive resistance on the ground circuit is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
19 This step determines if the AIR system is operating normally.
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Thursday, September 13th, 2018 AT 2:36 PM
Tiny
MUSICMAN08
  • MEMBER
Hi Roy, the vehicle was decarbonized after the secondary air pump, relay and secondary air valve were all replaced. After decarbonization, the mechanic replaced the two co2 sensors and within less then twenty miles, the check engine light came back on for the ninth time. I am taking the vehicle back to the garage for the ninth time as well. The new air pump I was told is running, the new relay installed is working. I am at wits end here and it is costing a small fortune. Thanks, John
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Thursday, September 13th, 2018 AT 3:44 PM
Tiny
ASEMASTER6371
  • EXPERT
What was decarbonized? Where did they get rid of the carbon? In the intake system?

Roy
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Thursday, September 13th, 2018 AT 3:48 PM
Tiny
MUSICMAN08
  • MEMBER
Hi Roy, the heads were decarbized I know. Not sure what else was decarbonized. I was told they did a complete decarbonization. I can ask them tomorrow when I drop off the vehicle. I know this mechanic has been doing this for years (I have know this mechanic for twenty years now) and told me this works most of the time.
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Thursday, September 13th, 2018 AT 3:56 PM
Tiny
ASEMASTER6371
  • EXPERT
Yep, most of the time. The issue is if the O2 sensor does not see the air in the exhaust, the code will set.

Roy
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Thursday, September 13th, 2018 AT 4:46 PM
Tiny
MUSICMAN08
  • MEMBER
Hi Roy. Well I just had the 2 co2 sensors replaced today, I had the decarbonization done last Friday, with new co2 sensors installed. The check engine light came on before I was able to get home turned around a let the mechanic know it came back on within two miles of me taking it home. He told me he drove it twenty miles before I picked it up. Are you saying there is still carbon possibly in the exhaust system? Or will the code reset itself and turn the check engine light off? John
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Thursday, September 13th, 2018 AT 4:54 PM
Tiny
ASEMASTER6371
  • EXPERT
What I am saying is there is still an issue if the light comes on. Twenty miles? No, the air pump system primarily works on cold start.

He needs to turn on the air pump with his scan tool and monitor the O2 sensor. It should go lean if the pump is working and sending air into the exhaust.

That is the way you test the system, not by throwing all parts at it.

Roy
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Thursday, September 13th, 2018 AT 5:04 PM
Tiny
MUSICMAN08
  • MEMBER
Roy, I will let the mechanic know what you said. You are so right. I keep buying these parts and decarbonization and nothing seems to be working. Check engine light keeps coming on (ninth time) and I have to get the car through Connecticut emissions in three weeks. Just so frustrated never had any problems in my forty four years of driving/owning a vehicle. As I said, I will be bringing it back tomorrow morning at 8:00 and let you know what happens. I Thank you very much for your help. It is greatly appreciated. John
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Thursday, September 13th, 2018 AT 5:18 PM
Tiny
ASEMASTER6371
  • EXPERT
You are welcome. Always glad to help.

Roy
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Thursday, September 13th, 2018 AT 5:23 PM

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