DTC B112A:11 [START STOP UNIT]

id0902p6020400

Description

IG2 relay circuit malfunction

Detection condition

•  Start stop unit detects the IG2 relay output monitor voltage of 2.5 V or less for 0.5 s or more with the ignition switched ON (engine off or on).

Fail-safe function

Not applicable

Possible cause

•  Start stop unit connector or terminal malfunction

•  Start stop unit malfunction

System wiring diagram

Not applicable

Description	IG2 relay circuit malfunction
Detection condition	• Start stop unit detects the IG2 relay output monitor voltage of 2.5 V or less for 0.5 s or more with the ignition switched ON (engine off or on).
Fail-safe function	Not applicable
Possible cause	• Start stop unit connector or terminal malfunction • Start stop unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY IF OTHER DTCs DISPLAYED FOR START STOP UNIT • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Are any other DTCs displayed?	Yes	Replace the start stop unit, then go to the Step 4. (See START STOP UNIT REMOVAL/INSTALLATION.)
1		No	Go to the next step.
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.
2		No	Repair or replace the connector, then go to the next step.
3	PERFORM DTC INSPECTION AND VERIFY IG2 RELAY MALFUNCTION • Always reconnect all disconnected connectors. • Reconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Switch the ignition ON (engine off or on) and wait for 0.5 s or more. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Replace the start stop unit, then go to the next step. (See START STOP UNIT REMOVAL/INSTALLATION.)
3		No	DTC troubleshooting completed.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT].) • Switch the ignition ON (engine off or on) and wait for 0.5 s or more. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.)
4		No	DTC troubleshooting completed.