Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001GJ5E |
Model Year Start: 2020 |
Model: Corolla |
Prod Date Range: [01/2019 - 04/2020] |
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P010012,P010017; Mass or Volume Air Flow Sensor "A" Circuit Short to Battery; 2020 MY Corolla Corolla HV [01/2019 - 04/2020] |
DTC
|
P010012
|
Mass or Volume Air Flow Sensor "A" Circuit Short to Battery
|
DTC
|
P010017
|
Mass or Volume Air Flow Sensor "A" Circuit Voltage Above Threshold
|
DESCRIPTION
The mass air flow meter sub-assembly is a sensor that measures the intake air volume. The ECM uses this information to determine the ignition timing and fuel injection duration necessary for an optimal air fuel ratio. Inside the mass air flow meter sub-assembly are a hot wire element and a cold wire element which are exposed to the flow of intake air. The bridge circuit shown in the illustration outputs voltage to transmit information regarding heat loss of the hot wire element caused by air flow. Depending on the air flow, this voltage will change between approximately 0.2 V and 4.9 V. Based on this voltage, the ECM calculates the air flow to determine the ignition timing and fuel injection duration necessary for an optimal air fuel ratio.
HINT:
When any of these DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. Fail-safe mode continues until a pass condition is detected.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Memory
|
Note
|
P010012
|
Mass or Volume Air Flow Sensor "A" Circuit Short to Battery
|
Both of the following conditions are met for 3 seconds or more: (1 trip detection logic)
-
The mass air flow meter sub-assembly voltage is higher than 4.9 V.
-
The engine speed is less than 4000 rpm.
|
-
Open or short in mass air flow meter sub-assembly circuit
-
Mass air flow meter sub-assembly
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0103
-
DTC for Mexico Models: Applies
|
P010017
|
Mass or Volume Air Flow Sensor "A" Circuit Voltage Above Threshold
|
Both of the following conditions are met for 3 seconds or more: (2 trip detection logic)
-
The mass air flow meter sub-assembly voltage is higher than 4.9 V.
-
The engine speed is 4000 rpm or higher.
|
-
Open or short in mass air flow meter sub-assembly circuit
-
Mass air flow meter sub-assembly
-
ECM
|
Comes on
|
DTC stored
|
-
SAE Code: P0103
-
DTC for Mexico Models: Does not apply
|
HINT:
When these DTCs are output, check the mass air flow rate in the Data List. Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.
DTC No.
|
Mass Air Flow Sensor
|
Malfunction
|
P010012
P010017
|
271.0 gm/sec or more
|
-
Short in VG circuit to power source circuit
-
Open in E2G circuit
|
If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.
MONITOR DESCRIPTION
If the mass air flow meter sub-assembly is malfunctioning or there is an open or short in the mass air flow meter sub-assembly circuit, the voltage will deviate from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter sub-assembly circuit, illuminate the MIL and stores a DTC.
Example:
When the sensor output voltage remains higher than 4.9 V for 3 seconds or more, the ECM stores a DTC.
MONITOR STRATEGY
Related DTCs
|
P0103: Mass air flow meter range check (high voltage)
|
Required Sensors/Components (Main)
|
Mass air flow meter sub-assembly
|
Required Sensors/Components (Related)
|
Crankshaft position sensor
|
Frequency of Operation
|
Continuous
|
Duration
|
3 seconds
|
MIL Operation
|
Immediate: Case 1
2 driving cycles: Case 2
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
All
Monitor runs whenever the following DTCs are not stored
|
None
|
Case 1
All of the following conditions are met
|
-
|
Engine speed
|
Less than 4000 rpm
|
Auxiliary battery voltage
|
8 V or higher
|
Power switch
|
On (IG)
|
Case 2
All of the following conditions are met
|
-
|
Engine speed
|
4000 rpm or higher
|
Auxiliary battery voltage
|
8 V or higher
|
Power switch
|
On (IG)
|
TYPICAL MALFUNCTION THRESHOLDS
Mass air flow meter voltage
|
Higher than 4.9 V
|
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
-
Connect the Techstream to the DLC3.
-
Turn the power switch on (IG).
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the power switch off and wait for at least 30 seconds.
-
Turn the power switch on (IG) [A].
-
Turn the Techstream on.
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
-
Start the engine.
-
Idle the engine for 5 seconds [B].
-
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
-
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.
-
With the engine running, during normal driving, increase the vehicle speed to 80 km/h (50 mph) [D].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
-
With the engine running, depress the accelerator pedal fully to increase the vehicle speed to between 100 and 120 km/h (62 and 75 mph) (engine speed of 4000 rpm or more) and maintain the speed for at least 5 seconds [E].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
-
Enter the following menus: Powertrain / Engine / Trouble Codes [F].
-
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 / Utility / All Readiness.
-
Input the DTC: P010012 or P010017.
-
Check the DTC judgment result.
Techstream 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
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
Read freeze frame data using the Techstream. 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
1.
|
CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
|
(a) Disconnect the mass air flow meter sub-assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C25-2 (E2G) - C77-104 (E2G)
|
Always
|
Below 1 Ω
|
C25-3 (VG) or C77-137 (VG) - Other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)
|
(a) Disconnect the mass air flow meter sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
C25-3 (VG) - C25-2 (E2G)
|
Power switch off
|
190 to 210 kΩ
|
C25-2 (E2G) - Body ground
|
Power switch off
|
Below 1 Ω
|
HINT:
Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.
Click here
|