DTC P051A-15: Crankcase Pressure Sensor "A" Circuit High Circuit Short to Battery or Open [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR
HINT:
Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.
- Disconnect the vacuum sensor assembly 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 C79-3 (VC) - C79-1 (GND) Ignition switch ON 4.5 to 5.5 V C79-2 (PPC1) - C79-1 (GND) Ignition switch ON 3.0 to 5.5 V *a Front view of wire harness connector
(to Vacuum Sensor Assembly) - Turn the ignition switch off and wait for at least 30 seconds.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C79-3 (VC) - C79-2 (PPC1) Ignition switch off 171 to 189 kΩ C79-1 (GND) - Body ground Always Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE VACUUM SENSOR ASSEMBLY
Refer to REMOVAL [10/2022 - ]
Result:
NG
See step 2
- CHECK HARNESS AND CONNECTOR (VACUUM SENSOR ASSEMBLY - ECM)
- Disconnect the vacuum sensor assembly connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C79-2 (PPC1) - C88-66 (PPC1) Always Below 1 Ω C79-1 (GND) - C88-64 (E1PC) Always Below 1 Ω C79-2 (PPC1) or C88-66 (PPC1) - Other terminals Always 10 kΩ or higher Result
Proceed to OK NG - None
Result:
OK
REPLACE ECM
Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR