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DTC 21-01:
Excessive Change of the Vehicle Speed Signal (Regular Diagnosis)
DTC 21-02:
Comparison Between the Vehicle Speed and the Engine Speed Signal (Regular Diagnosis)
NOTE:
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If the MIL indicator is on, troubleshoot the PGM-FI system first.
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Even though the system is operating normally, the EPS indicator will come on caused by detecting condition of the DTC 21-01 or DTC 21-02.
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Turn the ignition switch to LOCK (0).
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Connect the HDS to the data link connector (DLC).
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Turn off VSA by using the VSA OFF switch.
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Start the engine, then run the vehicle in the 4th gear (M/T), or D position (A/T).
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Check the VEHICLE SPEED in the DATA LIST with the HDS.
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Is vehicle speed indicated?
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YES
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Intermittent failure, the system is OK at this time.■
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NO
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-
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Check for DTCs in the PGM-FI system (M/T) or A/T system (A/T) with the HDS.
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Is DTC P0720 (M/T), P0721 (A/T), P0722 (A/T), or P0723 (A/T) indicated?
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YES
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-
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Troubleshoot the indicated DTC(s).■
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NO
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-
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Start the engine and check the tachometer.
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Is the tachometer working correctly?
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Check for DTCs in the gauge control module with the HDS.
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YES
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-
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Troubleshoot the indicated DTC(s).■
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NO
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-
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Turn the ignition switch to LOCK (0).
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Short the SCS line with the HDS.
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Disconnect the EPS control unit connector D (28P) and ECM/PCM connector A (44P) or ECM/PCM connector A (49P).
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Check for continuity between EPS control unit connector D (28P) terminal No. 1 and ECM/PCM connector A (44P) terminal No. 36
*1
or ECM/PCM connector A (49P) terminal No. 3
*2
.
*1: R20A3 engine model
*2: K24Z3 engine model
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YES
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-
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NO
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-
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Repair open in the wire between the EPS control unit and the ECM/PCM.■
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