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DTC P0819:00 [TCM (SJ6A-EL)]

DTC P0819:00

M position switch up or down switch signal: Signal error

DETECTION CONDITION

    M position switch signal error

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that M position switch is on in P, R or N position

  • Period: Confirmed continuously for 2 s

    Up switch malfunction or down switch signal error

  • Vehicle condition: TCM communication normal during engine rotation

  • Status: Detects that up or down switch is on while M position switch is off

  • Period: Confirmed continuously for 10 s

FAIL-SAFE FUNCTION

    M position switch signal error

  • Inhibits the manual shift control.

  • Inhibits manual shifting using the up or down switch of the selector lever.

  • Inhibits direct mode.

    Up switch malfunction or down switch signal error

  • Inhibits manual shifting using the up or down switch of the selector lever.

POSSIBLE CAUSE

    M position switch signal error

  • Instrument cluster DTC is stored.

  • M position switch malfunction

  • Short to power supply in wiring harness between selector lever component terminal E and instrument cluster terminal H

  • Short to ground in wiring harness between selector lever component terminal E and instrument cluster terminal H

  • Open circuit in wiring harness between selector lever component terminal E and instrument cluster terminal H

  • Open circuit in wiring harness between selector lever component terminal H and body ground

  • TCM connector or terminal malfunction

  • Selector lever component connector or terminal malfunction

  • TCM malfunction

    Up switch malfunction or down switch signal error

  • Instrument cluster DTC is stored.

  • Up switch malfunction

  • Down switch malfunction.

  • Short to power supply in wiring harness between selector lever component terminal C and instrument cluster terminal F

  • Short to power supply in wiring harness between selector lever component terminal D and instrument cluster terminal G

  • Short to ground in wiring harness between selector lever component terminal C and instrument cluster terminal F

  • Short to ground in wiring harness between selector lever component terminal D and instrument cluster terminal G

  • Open circuit in wiring harness between selector lever component terminal C and instrument cluster terminal F

  • Open circuit in wiring harness between selector lever component terminal D and instrument cluster terminal G

  • Open circuit in wiring harness between selector lever component terminal H and body ground

  • TCM connector or terminal malfunction

  • Selector lever component connector or terminal malfunction

  • Instrument cluster malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

 VERIFY RELATED REPAIR INFORMATION AVAILABILITY

  • Verify related Service Bulletins and/or on-line 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.

2

 CONFIRM INSTRUMENT CLUSTER DTC

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

3

 INSPECT SELECTOR LEVER COMPONENT CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the selector lever component connector.

  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

  • Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 11.

No

Go to the next step.

4

 INSPECT SELECTOR LEVER COMPONENT

Yes

Replace the selector lever component, then go to Step 11.

(See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)

No

Go to the next step.

5

 INSPECT SELECTOR LEVER COMPONENT GROUND CIRCUIT FOR OPEN CIRCUIT

  • Verify that the selector lever component connector is disconnected.

  • Inspect for continuity between selector lever component terminal H (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between selector lever component terminal H and body ground.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 11.

6

 INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION

  • Disconnect the instrument cluster connector.

  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

  • Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 11.

No

Go to the next step.

7

 INSPECT SELECTOR LEVER COMPONENT CIRCUIT FOR SHORT TO GROUND

  • Verify that the selector lever component and instrument cluster connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:

    • Selector lever component terminal E

    • Selector lever component terminal C

    • Selector lever component terminal D

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Selector lever component terminal E???Instrument cluster terminal H

  • Selector lever component terminal C???Instrument cluster terminal F

  • Selector lever component terminal D???Instrument cluster terminal G

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to Step 11.

No

Go to the next step.

8

 INSPECT SELECTOR LEVER COMPONENT CIRCUIT FOR SHORT TO POWER SUPPLY

  • Verify that the selector lever component and instrument cluster connectors are disconnected.

  • Switch the ignition ON (engine on).

  • Measure the voltage at the following terminals (wiring harness-side):

    • Selector lever component terminal E

    • Selector lever component terminal C

    • Selector lever component terminal D

  • Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Selector lever component terminal E???Instrument cluster terminal H

  • Selector lever component terminal C???Instrument cluster terminal F

  • Selector lever component terminal D???Instrument cluster terminal G

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 11.

9

 INSPECT SELECTOR LEVER COMPONENT CIRCUIT FOR OPEN CIRCUIT

  • Verify that the selector lever component and instrument cluster connectors are disconnected.

  • Switch the ignition off.

  • Inspect for continuity between the following terminals (wiring harness-side):

    • Selector lever component terminal E???Instrument cluster terminal H

    • Selector lever component terminal C???Instrument cluster terminal F

    • Selector lever component terminal D???Instrument cluster terminal G

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Selector lever component terminal E???Instrument cluster terminal H

  • Selector lever component terminal C???Instrument cluster terminal F

  • Selector lever component terminal D???Instrument cluster terminal G

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 11.

10

 INSPECT INSTRUMENT CLUSTER

Yes

Replace the instrument cluster, then go to the next step.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Go to the next step.

11

 VERIFY DTC TROUBLESHOOTING COMPLETED

Yes

Go to the applicable DTC inspection.

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)

No

DTC troubleshooting completed.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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