Intermittent failure, the system is OK at this time. Check for loose terminals between the ECM connector A (44P), and the VSA modulator-control unit 46P connector.
Refer to intermittent failures troubleshooting.
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Turn the ignition switch OFF.
Short the SCS line with the HDS.
Disconnect the ECM connector A (44P).
Disconnect the VSA modulator-control unit 46P connector.
Check for continuity between VSA modulator-control unit 46P connector terminal No. 38, No. 39 and ECM connector A (44P) terminal No. 37, No. 36 individually.