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DTC P0340:00 [PCM (SKYACTIV-G 2.0)]

DTC P0340:00

Intake CMP sensor circuit problem

DETECTION CONDITION

  • The intake CMP sensor input signal pattern, received while the crankshaft rotates 24 times, is incorrect.

    Diagnostic support note

  • This is a continuous monitor (CCM).

  • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA/Snapshot data is available.

  • DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

  • Set the electric variable valve timing control to the maximum cam retard mode.

POSSIBLE CAUSE

  • Intake CMP sensor connector or terminals malfunction

  • Short to ground or open circuit in intake CMP sensor power supply circuit

    • Short to ground in wiring harness between ENGINE1 10 A fuse and intake CMP sensor terminal C

    • ENGINE1 10 A fuse malfunction

    • Open circuit in wiring harness between main relay terminal C and intake CMP sensor terminal C

  • Short to ground in wiring harness between intake CMP sensor terminal A and PCM terminal 1Y

  • PCM connector or terminals malfunction

  • Short to power supply in wiring harness between intake CMP sensor terminal A and PCM terminal 1Y

  • Intake CMP sensor signal circuit and ground circuit are shorted to each other

  • Open circuit in wiring harness between the following terminals:

    • Intake CMP sensor terminal A—PCM terminal 1Y

    • Intake CMP sensor terminal B—PCM terminal 1AC

  • Intake CMP sensor malfunction

    • Intake CMP sensor is dirty

    • Intake CMP sensor pulse wheel malfunction

    • Damage to the detection area of the intake CMP sensor

  • CKP sensor connector or terminals malfunction

  • Loose timing chain or improper valve timing

  • PCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION

NOTE:

  • Recording can be facilitated using the screen capture function of the PC.

  • Record the FREEZE FRAME DATA/snapshot data on the repair order.

—

Go to the next step.

2

 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.

3

 VERIFY RELATED PENDING CODE AND/OR DTC

Yes

Go to the applicable PENDING CODE or DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

4

 INSPECT INTAKE CMP SENSOR CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the intake CMP sensor 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 14.

No

Go to the next step.

5

 INSPECT INTAKE CMP SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT

  • Verify that the intake CMP sensor connector is disconnected.

  • Switch the ignition ON (engine off).

    NOTE:

    • Another DTC may be stored by the PCM detecting an open circuit.

  • Measure the voltage at the intake CMP sensor terminal C (wiring harness-side).

  • Is the voltage B+?

Yes

Go to the next step.

No

Inspect the ENGINE1 10 A fuse.

  • If the fuse is blown:

    • Refer to the wiring diagram and verify whether or not there is a common connector between ENGINE1 10 A fuse and intake CMP sensor terminal C.

        • 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.

      • Replace the fuse.

  • If the fuse is damaged:

    • Replace the fuse.

  • If the fuse is normal:

    • Refer to the wiring diagram and verify whether or not there is a common connector between main relay terminal C and intake CMP sensor terminal C.

        • 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 14.

6

 INSPECT INTAKE CMP SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND

  • Verify that the intake CMP sensor connector is disconnected.

  • Switch the ignition off.

  • Inspect for continuity between intake CMP sensor terminal A (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Disconnect the PCM connector and inspect the wiring harness for short to ground.

  • If the short to ground circuit could be detected in the wiring harness:

    • Refer to the wiring diagram and verify whether or not there is a common connector between intake CMP sensor terminal A and PCM terminal 1Y.

        • 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 14.

No

Go to the next step.

7

 INSPECT PCM CONNECTOR CONDITION

  • Disconnect the PCM 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 14.

No

Go to the next step.

8

 INSPECT INTAKE CMP SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

  • Verify that the intake CMP sensor and PCM connectors are disconnected.

  • Switch the ignition ON (engine off).

    NOTE:

    • Another DTC may be stored by the PCM detecting an open circuit.

  • Measure the voltage at the intake CMP sensor terminal A (wiring harness-side).

  • 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 intake CMP sensor terminal A and PCM terminal 1Y.

    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 14.

9

 INSPECT INTAKE CMP SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER

  • Verify that the intake CMP sensor and PCM connectors are disconnected.

  • Switch the ignition off.

  • Inspect for continuity between intake CMP sensor terminals A and B (wiring harness-side).

  • Is there continuity?

Yes

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

  • Intake CMP sensor terminal A—PCM terminal 1Y

  • Intake CMP sensor terminal B—PCM terminal 1AC

    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 each other.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

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

Go to Step 14.

No

Go to the next step.

10

 INSPECT INTAKE CMP SENSOR CIRCUIT FOR OPEN CIRCUIT

  • Verify that the intake CMP sensor and PCM connectors are disconnected.

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

    • Intake CMP sensor terminal A—PCM terminal 1Y

    • Intake CMP sensor terminal B—PCM terminal 1AC

  • 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:

  • Intake CMP sensor terminal A—PCM terminal 1Y

  • Intake CMP sensor terminal B—PCM terminal 1AC

    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 14.

11

 INSPECT INTAKE CMP SENSOR

Yes

Replace the intake CMP sensor, then go to Step 14.

(See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

12

 INSPECT CKP SENSOR CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the CKP sensor 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 14.

No

Go to the next step.

13

 VERIFY ASSEMBLY CONDITION OF TIMING CHAIN

Yes

Repair or replace the malfunctioning part.

Assemble the timing chain using the correct timing, then go to the next step.

(See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

14

 VERIFY DTC TROUBLESHOOTING COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

15

 VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

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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