DTC Troubleshooting: 61-01, 61-21, 61-22, 61-23

DTC 61-01:  Modulator-control Unit Initial IG Low Voltage
  
  
DTC 61-22:  Modulator-control Unit Power Source Low Voltage 2
  
  

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 61-01, 61-21, 61-22, or 61-23 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.Check and note BATTERY voltage in the VSA DATA LIST with the HDS. If the voltage listed is 0 V, go to 8, otherwise go to 6.

6.Using a voltmeter, measure and note the voltage between the battery terminals.

NOTE: If the voltage is below 9.5 V, check the battery, and do the alternator regulator circuit troubleshooting: R18A1 engine model, K20Z2 engine model.

7.Compare the voltage noted in 5 to the voltage 6.

If the difference between the two voltage readings less then 3 V?


YES - 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


NO - 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


8.Turn the ignition switch OFF.

9.Disconnect the VSA modulator-control unit 37P connector.

10.Measure voltage between VSA modulator-control unit 37P connector terminal No. 13 and body ground.

 

Is there battery voltage?


YES - Go to 11.


NO - Repair open in the wire between the No. 3 FSR (40 A) fuse and the VSA modulator-control unit.n

11.Turn the ignition switch ON (II).

12.Measure voltage between VSA modulator-control unit 37P connector terminal No. 28 and body ground.

 

Is there battery voltage?


YES - 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


NO - Repair open in the wire between the No. 4 (7.5 A) fuse and the VSA modulator-control unit.n