Mazda Factory OBD-II DTC P0500, P1934 Code Diagnostic Procedure

DETECTION CONDITION

•  The PCM monitors the vehicle speed signal from the ABS HU/CU by CAN. If the signal at PCM deviates from the threshold, the PCM determines that the there is an ABS system problem.

POSSIBLE CAUSE

•  ABS HU/CU system malfunction

•  PCM malfunction

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

•  Has the FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

•  Verify related service repair information availability.

•  Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

•  If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?

•  Connect the M-MDS to the DLC-2.

•  Clear the DTC from the PCM memory using the M-MDS.

•  Run the vehicle under the FREEZE FRAME DATA stored condition.

•  Is the same DTC present?

Yes

Go to the next step.

No

Intermittent concern exists.

Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.

4

VERIFY ABS STORED DTC

•  Turn the engine switch off then to the ON (Engine off).

•  Verify the stored DTCs.

•  Is the DTC present?

Yes

Go to the applicable DTC troubleshooting, then go to the next step.

No

Go to the next step.

5

VERIFY THAT DTC P0500 AND/OR P1934 TROUBLESHOOTING IS COMPLETED

•  Make sure to reconnect all disconnected connectors.

•  Clear the DTC from the PCM memory using the M-MDS.

•  Run the vehicle under the FREEZE FRAME DATA stored condition.

•  Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

No

Go to the next step.

6

VERIFY AFTER REPAIR PROCEDURE

•  Perform the after repair procedure.

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

No

DTC troubleshooting completed.