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EPS DTC Troubleshooting: 22-01

DTC 22-01:
 Engine Speed Signal (Regular Diagnosis)
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Test-drive the vehicle. Drive the vehicle at 10 km/h (7 mph) for 3 seconds or more.
  1. Check the ENGINE SPEED in the EPS DATA LIST with the HDS.
Is there 440 rpm (min −1 ) or less at idle?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EPS control unit connector C (16P).
  1. Start the engine.
  1. Measure the voltage between EPS control unit connector C (16P) terminal No. 7 and body ground.
Is there any voltage?
YES -
Go to Step 9 .
NO -
Go to Step 14 .
  1. Turn the ignition switch to LOCK (0).
  1. Short the SCS line with the HDS.
  1. Disconnect the ECM/PCM connector A (49P).
  1. Turn the ignition switch to ON (II).

  1. Measure the voltage between EPS control unit connector C (16P) terminal No. 7 and body ground.
Is there any voltage?
YES -
Repair short to power in the wire between the EPS control unit and ECM/PCM.■
NO -
Check for loose terminal in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit.
  1. Turn the ignition switch to LOCK (0).
  1. Short the SCS line with the HDS.
  1. Disconnect the ECM/PCM connector A (49P).

  1. Check for continuity between EPS control unit connector C (16P) terminal No. 7 and body ground.
Is there continuity?
YES -
Repair short to body ground in the wire between the EPS control unit and the ECM/PCM.■
NO -
Go to Step 18 .

  1. Check for continuity between EPS control unit connector C (16P) terminal No. 7 and ECM/PCM connector A (49P) terminal No. 29.
Is there continuity?
YES -
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then go to Step 1 and recheck. If the ECM/PCM was updated and DTCs are not indicated, troubleshooting is complete. If the ECM/PCM was substituted and DTCs are not indicated, replace the original ECM/PCM.
NO -
Repair open in the wire between the EPS control unit and the ECM/PCM.■