On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT INTAKE AIR CONTROL VALVE (for ACIS)
(a) Remove the V-bank cover sub-assembly.
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| (b) Disconnect the vacuum hose sub-assembly from the intake air control valve (for ACIS). |
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(c) Connect a hose and vacuum pump to the intake air control valve (for ACIS).
| (d) Using the vacuum pump, apply a vacuum to the intake air control valve (for ACIS). Check that the actuator rod operates when vacuum is applied. If the actuator rod does not operate when vacuum is applied, replace the intake air surge tank assembly. |
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(e) Using the vacuum pump, apply a vacuum to the intake air control valve (for ACIS). Check that there is no change in vacuum after 1 minute.
If the operation is not as specified, replace the intake air surge tank assembly.
(f) Disconnect the hose and vacuum pump from the intake air control valve (for ACIS).
(g) Connect the vacuum hose sub-assembly to the intake air control valve (for ACIS).
(h) Install the V-bank cover sub-assembly.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed (P0AA373)
DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU detects a stuck closed malfunction of a system main relay on the HV battery negative side. The cause of this malfunction may be one of the following: Inverter voltage sensor (VH) internal circuit malfunction Voltage sensor (VH) malfu ...
