2ZR-FE ENGINE CONTROL SFI SYSTEM P2228 Barometric Pressure Circuit Low Input P2229 Barometric Pressure Circuit High Input
DESCRIPTION
The vacuum sensor is installed inside the engine compartment and measures the atmospheric pressure using a built-in sensor. The ECM determines the altitude of the vehicle based on the output voltage of the vacuum sensor and corrects the intake air volume measured by the mass air flow meter sub-assembly to perform air fuel ratio control.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P2228 | Barometric Pressure Circuit Low Input | The output voltage from the vacuum sensor is less than 1.4 V for 3 seconds or more (1 trip detection logic). | ·
Open or short in vacuum sensor circuit ·
Vacuum sensor ·
ECM |
Does not come on | DTC stored |
| P2229 | Barometric Pressure Circuit High Input | The output voltage from the vacuum sensor is higher than 4.0 V for 3 seconds or more (1 trip detection logic). | ·
Open or short in vacuum sensor circuit ·
Vacuum sensor ·
ECM |
Does not come on | DTC stored |
- HINT:
-
When any of these DTCs are output, check the atmospheric pressure using the GTS. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Atmospheric Pressure.
MONITOR DESCRIPTION
The ECM monitors the vacuum sensor voltage and uses this value to calculate atmospheric pressure. If the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the vacuum sensor and stores a DTC.
Example:
If the sensor output voltage is less than 1.4 V, or higher than 4.0 V for 3 seconds or more, the ECM stores a DTC.
MONITOR STRATEGY
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the pending DTCs.
- HINT:
- ·
If a pending DTC is output, the system is malfunctioning.
·If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P2228 or P2229.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
| N/A | ·
Unable to perform DTC judgment ·
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit |
- HINT:
- ·
If the judgment result shows NORMAL, the system is normal.
·If the judgment result shows ABNORMAL, the system has a malfunction.
·If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- HINT:
-
Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Atmosphere Pressure.
- Powertrain > Engine and ECT > Data List
-
Tester Display Atmosphere Pressure - 50003 234 7
Read the Atmosphere Pressure value.
- OK:
Same value as the actual atmospheric pressure.
- HINT:
-
Standard atmospheric pressure is 101 kPa(abs) [758 mmHg(abs)]. For every 100 m (328 ft.) increase in altitude, atmospheric pressure drops by approximately 1 kPa (7.5 mmHg). The pressure also varies due to the weather (high atmospheric pressure, low atmospheric pressure).
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Vacuum Sensor) |
Disconnect the vacuum sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition B62-3 (VC) - B62-1 (E2) Ignition switch ON 4.75 to 5.25 V B62-2 (PIM) - B62-1 (E2) Ignition switch ON 3.0 to 5.25 V
- Result:
Proceed to OK NG
OK
NG
Replace the vacuum sensor.
Click hereEngine / Hybrid System>2ZR-FE EMISSION CONTROL>VACUUM SENSOR>REMOVAL
- Result:
Proceed to NEXT
NEXT
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTC.
- Powertrain > Engine and ECT > Clear DTCs
- 50002 234
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
- Powertrain > Engine and ECT > Trouble Codes
- 50001 234
- Result:
Result Proceed to DTCs are not output A DTC P2228 or P2229 is output B
A
B
Disconnect the vacuum sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition B62-3 (VC) - B64-77 (VC) Always Below 1 Ω B62-1 (E2) - B64-76 (E2) Always Below 1 Ω B62-2 (PIM) - B64-78 (HAC) Always Below 1 Ω B62-3 (VC) or B64-77 (VC) - Body ground and other terminals Always 10 kΩ or higher B62-2 (PIM) or B64-78 (HAC) - Body ground and other terminals Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG