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DTC B10E7:16 [START STOP UNIT]

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2016 – MX-5 – Body and Accessories

DTC B10E7:16 [START STOP UNIT]

Description

IG1 relay circuit malfunction

Detection condition

  • Start stop unit detects the IG1 monitor voltage of less than 2.5 V for 1 s or more while the engine is not being cranked with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

  • IG1 relay malfunction

  • IG1 relay circuit malfunction

    • Short to ground in wiring harness between MAIN 200 A fuse and IG1 relay terminal D

    • MAIN 200 A fuse malfunction

    • Open circuit in wiring harness between battery positive terminal and IG1 relay terminal D

  • Start stop unit connector or terminal malfunction

  • Wiring harness between IG1 relay terminal C and start stop unit terminal 1B malfunction

    • Short to ground in wiring harness between IG1 relay terminal C and start stop unit terminal 1B

    • C/U IG1 15 A fuse malfunction

  • Wiring harness between IG1 relay terminal C and start stop unit terminal 1B malfunction

    • C/U IG1 15 A fuse malfunction

    • Open circuit in wiring harness between IG1 relay terminal C and start stop unit terminal 1B

  • Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT IG1 RELAY

Yes

Go to the next step.

No

Replace the IG1 relay, then go to Step 6.

(See RELAY LOCATION.)

2

INSPECT IG1 RELAY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

Yes

Go to the next step.

No

Inspect the MAIN 200 A fuse.

  • If the fuse is blown:

    • Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and IG1 relay terminal D.

      • 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 battery positive terminal and IG1 relay terminal D.

      • 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 6.

3

INSPECT START STOP UNIT CONNECTOR CONDITION

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Disconnect the start stop unit connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

4

INSPECT IG1 RELAY CIRCUIT FOR SHORT TO GROUND

  • Verify that the IG1 relay is removed.

  • Verify that the start stop unit connector is disconnected.

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

    • IG1 relay terminal C

    • Start stop unit terminal 1B

  • Is there continuity?

Yes

Inspect the C/U IG1 15 A fuse.

  • If the fuse is blown:

    • Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and start stop unit terminal 1B.

      • 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 IG1 relay terminal C and C/U IG1 15 A fuse.

      • 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 6.

No

Go to the next step.

5

INSPECT IG1 RELAY CIRCUIT FOR OPEN CIRCUIT

  • Verify that the IG1 relay is removed.

  • Verify that the start stop unit connector is disconnected.

  • Inspect for continuity between IG1 relay terminal C (wiring harness-side) and start stop unit terminal 1B (wiring harness-side).

  • Is there continuity?

Yes

Go to the next step.

No

Inspect the C/U IG1 15 A 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 IG1 relay terminal C and start stop unit terminal 1B.

      • 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 the next step.

6

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

7

VERIFY IF OTHER DTCs DISPLAYED

  • Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [START STOP UNIT].)

No

DTC troubleshooting completed.

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