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DTC B10E7:11 [START STOP UNIT]

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2016 – MX-5 – Body and Accessories

DTC B10E7:11 [START STOP UNIT]

Description

IG1 relay circuit malfunction

Detection condition

  • Start stop unit detects the voltage from the IG1 relay output monitor as less than 2.5 V for 0.5 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

  • Start stop unit connector or terminal malfunction

  • Short to ground in wiring harness between IG1 relay terminal A and start stop unit terminal 2S

  • 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 4.

(See RELAY LOCATION.)

2

INSPECT START STOP UNIT CONNECTOR CONDITION

  • 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 4.

3

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 IG1 relay terminal A (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal A and start stop unit terminal 2S.

    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 the next step.

No

Go to the next step.

4

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

5

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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