DTC Troubleshooting: 62-21

DTC 62-21:  Modulator-control Unit IG High Voltage

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Turn the ignition switch OFF, then start the engine.

4.Check for DTCs with the HDS.

Is DTC 62-21 indicated?


YES - Go to 5.


NO - Intermittent failure, the system is OK at this time. Check for loose terminals at the VSA modulator-control unit 37P connector. Refer to intermittent failures troubleshooting.n


5.Using a voltmeter, measure the voltage between the battery terminals. Compare the voltage measured at the battery with the voltage shown in the VSA DATA LIST with the HDS.

Is the voltage difference 3 V or more?


YES - Replce the VSA modulator-control unit.n


NO - Check the battery, and do the alternator regulator circuit troubleshooting: R18A1 engine model, K20Z2 engine model. Also check for loose terminals in the VSA modulator-control unit 37P connector. If necessary, substitute a known-good VSA modulator-control unit and retest.n