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, system is OK at this time. Check for loose terminals at the ABS modulator-control unit. Refer to intermittent failures troubleshooting.n


5.Check and note BATTERY voltage in the ABS 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 step 5 to the voltage step 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 ABS modulator-control unit 25P connector. Refer to intermittent failures troubleshooting.n


NO - Check for loose terminals in the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit, and retest: Except K20Z2 engine model, K20Z2 engine model.n


8.Turn the ignition switch OFF.

9.Disconnect the ABS modulator-control unit 25P connector.

10.Measure voltage between ABS modulator-control unit 25P connector terminal No. 8 and body ground.

 

Is there battery voltage?


YES - Go to 11.


NO - Repair open in the wire between the No. 3 FSR (30 A) fuse and the ABS modulator-control unit.n

11.Turn the ignition switch ON (II).

12.Measure voltage between the ABS modulator-control unit 25P connector terminal No. 16 and body ground.

 

Is there battery voltage?


YES - Check for loose terminals in the ABS modulator-control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit and retest: Except K20Z2 engine model, K20Z2 engine model.n


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