DESCRIPTION LOCATION
The active control engine mount system decreases engine vibration at a low engine speed using the vacuum switching valve (for active control engine mount system). The vacuum switching valve (for active control engine mount system) is controlled by a pulse signal transmitted to the vacuum switching valve (for active control engine mount system) from the ECM. The frequency of this pulse signal is matched to the engine speed to decrease engine vibration. WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Engine / Active Test / Activate the ACM Inhibit. Powertrain > Engine > Active Test
(e) According to the display on the Techstream, perform the Active Test to operate the vacuum switching valve (for active control engine mount system) and for check the operating sound of the vacuum switching valve (for active control engine mount system). OK: Operating sounds can be heard.
(a) Check the air and vacuum hoses for looseness, disconnection and blockage. OK: No looseness, disconnection or blockage.
 (a) Disconnect the vacuum hose from the vacuum pump assembly. (b) Start the engine. (c) Check that the disconnected port located on the vacuum pump assembly applies suction to your finger. OK: Vacuum exists.
(a) Inspect the front engine mounting insulator. Click here
(a) Inspect the rear engine mounting insulator. Click here
(a) Disconnect the vacuum switching valve (for active control engine mount system) connector. (b) Turn the engine switch on (IG). (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Inspect the vacuum switching valve (for active control engine mount system). Click here
(a) Disconnect the vacuum switching valve (for active control engine mount system) connector. (b) Disconnect the ECM connector. (c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: Engine Failed to Start Mechanical Linkage Failure (P1C7779)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC is stored when the hybrid vehicle control ECU determines that the hybrid transaxle assembly has seized or that there is the hybrid transaxle assembly malfunction in the drivetrain. The cause of this malfunction may be one of the following: Engine malfunct ...
