DTC 22-01: Engine Speed Signal

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Test-drive the vehicle. Drive the vehicle at 7 mph (10 km/h) for 3 seconds or more.
Check the ENGINE SPEED in the EPS DATA LIST with the HDS.
Is there 440 rpm 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 at the PCM and EPS control unit.
Turn the ignition switch to LOCK (0).
Short the SCS line with the HDS.
Disconnect the PCM connector A (44P) (see PCM REPLACEMENT ).
Disconnect the EPS control unit connector C (16P) (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).
Check for continuity between EPS control unit connector C (16P) terminal No. 7 and body ground.

Fig 1: Checking Continuity Between EPS Control Unit Connector C (16P) Terminal 7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the wire between the EPS control unit and the PCM.

NO -Go to step 10.
Check for continuity between EPS control unit connector C (16P) terminal No. 7 and PCM connector A (44P) terminal No. 28.

Fig 2: Checking Continuity Between EPS Control Unit Connector C (16P) Terminal 7 And PCM Connector A (44P) Terminal 28
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 11.

NO -Repair an open in the wire between the EPS control unit and the PCM.
Reconnect PCM connector A (44P).
Turn the ignition switch to ON (II).
Measure the voltage between EPS control unit connector C (16P) terminal No. 7 and body ground.

Fig 3: Measuring Voltage Between EPS Control Unit Connector C (16P) Terminal 7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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 PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 1 and recheck. If the PCM was updated and DTCs are not indicated, troubleshooting is complete. If the PCM was substituted and DTCs are not indicated, replace the original PCM (see PCM REPLACEMENT ).