Thread: P0410 Code
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Old 09-04-2013, 10:20 AM   #7
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 39,176
 

2003 L-Series 3.0L Sedan
Default Re: P0410 Code

A partial reprint from the service manual;

The secondary air injection (AIR) system is used to accelerate the heating process of the catalytic converters by introducing outside air into the exhaust manifold. The air pump operates on cold engine starts when the catalytic converters are least efficient. The AIR system consists of the air pump, combination valve, air pipe/hoses, check valve, air pump solenoid, air pump relay and powertrain control module (PCM). The PCM controls the ground for the air pump relay coil, which turns the air pump ON and OFF. The PCM also controls the ground for the air pump solenoid, which allows manifold vacuum to move the combination valve. The air pump solenoid and air pump relay are controlled independently to prevent exhaust gas from entering the air pump. During air pump operation, the oxygen sensor 1 (O2S-1) should read lean indicating the air pump system is working. DTC P0410 sets when the PCM commands the AIR system ON and the O2S-1 signal does not indicate a lean condition for a certain length of time.

DTC Parameters
DTC P0410 will set if AIR system is being commanded ON during a cold start and O2S-1 signal does not indicate a lean condition (voltage greater than 300 mV) for a minimum of 2.5 seconds out of a 10 second test when the following parameters are met for at least 6 seconds while the test is running.
  • The engine speed is less than 3200 RPM.
  • The startup engine coolant temperature (ECT) is between 4-79C (39-174F).
  • The O2S-1 is above 600 mV for at least 2 seconds.
  • The intake air temperature (IAT) is greater than 0C (32F).
  • The manifold absolute pressure (MAP) is greater than 20 kPa.
  • The ignition voltage is between 11-18 volts.
  • The traction control is not active.
  • The commanded air/fuel ratio is between 12:1 and 14:1.
  • The calculated air flow is between 8-19 gm/s.
  • No 5-volt reference, ECT, EGR, fuel trim, idle air control (IAC), IAT, MAP, misfire, O2S-1 or throttle position (TP) sensor DTCs have been set.
The following applies to vehicles built after VIN 1Z200000. If the air pump does not run long enough to obtain accurate test results, the PCM may run up to 5 independent tests if a test fails or does not fully run. The PCM must see the O2S-1 voltage go below 300 mV for at least 1.5 seconds out of a maximum 6 second test. The PCM will wait 20 seconds between each test if another test is going to run.
Conditions to run the active test:
  • The ECT is greater than 75C (167F).
  • The commanded air/fuel ratio is 14.7:1.
  • The engine is at idle for at least 4 seconds.
  • STFT is between 122-134

Green corrosion is normal for bare copper wires - its oxidation and normal except if it interferes with terminations, preventing a good electrical connection. Ground connections are fine as long as the corrosion isn't directly under the wire that's bolted to ground studs on the chassis or engine stud mounts.
Attached Images
File Type: jpg air pump system.jpg (104.1 KB, 36 views)

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