DTC P219B
DTC P219B: Air-Fuel Ratio Variation of Cylinder (Bank 2, Front Bank)
General Description
The powertrain control module (PCM) measures the air/fuel ratio by the signal from the front air/fuel ratio (A/F) sensor (bank 2, sensor 1). If the air/fuel ratio varies between the cylinders, the signal from the front A/F sensor (bank 2, sensor 1) fluctuates while all cylinders complete the combustion cycle (two engine revolutions as one cycle). The PCM varies the engine air/fuel ratio at a specified frequency to measure the dispersion between the cylinders, and obtained air/fuel ratio fluctuation are filtered to extract the value. If the ratio between the integrated filtered output and the integrated varied air fuel ratio is a set value or more, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | At least 7.5 seconds but not more than 11.5 seconds |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Engine coolant temperature [ECT SENSOR 1] | 156 °F (69 °C) | - | |
| Engine speed [ENGINE SPEED]* 1 | - | 3, 400 rpm | |
| Engine speed [ENGINE SPEED]* 2 | - | 3, 200 rpm | |
| Intake air amount* 1 | 1, 500 rpm | 0.01 oz (0.30 g) | 0.02 oz (0.58 g) |
| 2, 400 rpm | 0.01 oz (0.30 g) | 0.021 oz (0.60 g) | |
| Intake air amount* 2 | 1, 500 rpm | 0.008 oz (0.25 g) | 0.02 oz (0.58 g) |
| 2, 400 rpm | 0.008 oz (0.25 g) | 0.021 oz (0.60 g) | |
| Monitoring priority | P0400 | ||
*1: 6-Speed A/T
*2: 9-Speed A/T
[ ]: HDS Parameter
Malfunction Threshold
The integrated front A/F sensor (bank 2, sensor 1) output variation value is 5.0 or more in 11.5 seconds.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Fuel injector failure
- Engine compression abnormal
- Valve clearance incorrect
Confirmation Procedure
Operating Condition
- 1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3, 000 rpm without load (in P or N) until the radiator fan comes on.
- 2.
Drive the vehicle in 4th gear at a steady engine speed [ENGINE SPEED] 1, 000 - 1, 200 rpm.
- 3.
Take 10 - 15 seconds to accelerate up to engine speed [ENGINE SPEED] 3, 400* 1 (3, 200)* 2 rpm.
- 4.
When the diagnosis does not finish, repeat driving pattern steps 2 through 3, five times.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive drive cycles in which the engine conditions are similar to the first time the malfunction was detected. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.