DTC 22-01: Engine Speed Signal
- Start the engine.
- Check the ENGINE SPEED in the EPS DATA LIST with the HDS.
Is 0-300 rpm indicated?
YES - Go to step 3.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the PCM and EPS control unit.
- Turn the ignition switch to LOCK (0).
- Short the SCS line with the HDS.
- Disconnect ECM/PCM connector A (49P). (See SUBSTITUTING THE ECM/PCM ).
- Disconnect EPS control unit connector A (11P). See EPS CONTROL UNIT REMOVAL/INSTALLATION .
- Check for continuity between EPS control unit connector A (11P) terminal No. 9 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 8.
- Check for continuity between EPS control unit connector A (11P) terminal No. 9 and ECM/PCM connector A (49P) terminal No. 29.Fig 2: Checking Continuity Between ECM/PCM Connector A (49P) Terminal & EPS Control Unit Connector A (11P) Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES - Go to step 9.
NO - Repair open in the wire between the EPS control unit and the ECM/PCM.
- Reconnect ECM/PCM connector A (49P).
- Turn the ignition switch to ON (II).
- Measure the voltage between EPS control unit connector A (11P) terminal No. 9 and body ground.
Is there battery voltage?
YES - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).
NO - Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE 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 (see ECM/PCM REPLACEMENT ).