DTC B10E7:16 [START STOP UNIT]

id0902p6020200

Description

IG1 relay No.1 or IG1 relay No.2 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 No.1 or IG1 relay No.2 malfunction

•  IG1 relay No.1 or IG1 relay No.2 power supply circuit malfunction

―  Short to ground in wiring harness between the following terminals:

•  MAIN 200 A fuse—IG1 relay No.1 terminal D

•  MAIN 200 A fuse—IG1 relay No.2 terminal D

―  MAIN 200 A fuse malfunction

―  IG1 2 30 A fuse malfunction

―  Open circuit in wiring harness between the following terminals:

•  Battery positive terminal—IG1 relay No.1 terminal D

•  Battery positive terminal—IG1 relay No.2 terminal D

•  Open circuit in wiring harness between the following terminals:

―  IG1 relay No.1 terminal A—Body ground

―  IG1 relay No.2 terminal E—Body ground

•  Wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A malfunction

―  Short to ground in wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A

―  METER1 10 A fuse malfunction

―  Open circuit in wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A

•  Start stop unit connector or terminal malfunction

•  Open circuit in wiring harness between IG1 relay No.1 terminal E and start stop unit terminal 2S

•  Wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B malfunction

―  Short to ground in wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B

―  C/U IG1 15 A fuse malfunction

―  Open circuit in wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B

•  Start stop unit malfunction

Description	IG1 relay No.1 or IG1 relay No.2 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 No.1 or IG1 relay No.2 malfunction • IG1 relay No.1 or IG1 relay No.2 power supply circuit malfunction ― Short to ground in wiring harness between the following terminals: • MAIN 200 A fuse—IG1 relay No.1 terminal D • MAIN 200 A fuse—IG1 relay No.2 terminal D ― MAIN 200 A fuse malfunction ― IG1 2 30 A fuse malfunction ― Open circuit in wiring harness between the following terminals: • Battery positive terminal—IG1 relay No.1 terminal D • Battery positive terminal—IG1 relay No.2 terminal D • Open circuit in wiring harness between the following terminals: ― IG1 relay No.1 terminal A—Body ground ― IG1 relay No.2 terminal E—Body ground • Wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A malfunction ― Short to ground in wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A ― METER1 10 A fuse malfunction ― Open circuit in wiring harness between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A • Start stop unit connector or terminal malfunction • Open circuit in wiring harness between IG1 relay No.1 terminal E and start stop unit terminal 2S • Wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B malfunction ― Short to ground in wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B ― C/U IG1 15 A fuse malfunction ― Open circuit in wiring harness between IG1 relay No.2 terminal C and start stop unit terminal 1B • Start stop unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT IG1 RELAY No.1 AND IG1 RELAY No.2 • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Remove the IG1 relay No.1 and the IG1 relay No.2. (See RELAY LOCATION.) • Inspect the IG1 relay No.1 and the IG1 relay No.2. (See RELAY INSPECTION.) • Are the IG1 relay No.1 and the IG1 relay No.2 normal?	Yes	Go to the next step.
1		No	Replace the malfunctioning part, then go to Step 10. (See RELAY LOCATION.)
2	INSPECT FOR OPEN CIRCUIT OR SHORT TO GROUND IN IG1 RELAY No.1 AND IG1 RELAY No.2 POWER SUPPLY CIRCUIT • Verify that the IG1 relay No.1 and the IG1 relay No.2 are removed. • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Measure the voltage at the following terminals (wiring harness-side): ― IG1 relay No.1 terminal D ― IG1 relay No.2 terminal D • Is the voltage B+?	Yes	Go to the next step.
2		No	Inspect the MAIN 200 A fuse and IG1 2 30 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAIN 200 A fuse—IG1 relay No.1 terminal D • MAIN 200 A fuse—IG1 relay No.2 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 malfunction. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a malfunction. • Replace the malfunctioning fuse. • If the fuse is damaged: ― Replace the malfunctioning fuse. • If all fuses are normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Battery positive terminal—IG1 relay No.1 terminal D • Battery positive terminal—IG1 relay No.2 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 malfunction. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a malfunction. Go to Step 10.
3	INSPECT IG1 RELAY No.1 AND IG1 RELAY No.2 GROUND CIRCUIT FOR OPEN CIRCUIT • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Verify that the IG1 relay No.1 and the IG1 relay No.2 are removed. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― IG1 relay No.1 terminal A ― IG1 relay No.2 terminal E • Is there continuity?	Yes	Go to the next step.
3		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • IG1 relay No.1 terminal A—Body ground • IG1 relay No.2 terminal E—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 10.
4	INSPECT FOR SHORT TO GROUND IN IG1 RELAY No.1 AND IG1 RELAY No.2 CIRCUIT • Verify that the IG1 relay No.1 and the IG1 relay No.2 are removed. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― IG1 relay No.1 terminal C ― IG1 relay No.2 terminal A • Is there continuity?	Yes	Inspect the METER1 10 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay No.1 terminal C and IG1 relay No.2 terminal A. 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. Go to Step 10.
4		No	Go to the next step.
5	INSPECT FOR OPEN CIRCUIT IN IG1 RELAY No.1 AND IG1 RELAY No.2 CIRCUIT • Verify that the IG1 relay No.1 and the IG1 relay No.2 are removed. • Inspect for continuity between IG1 relay No.1 terminal C (wiring harness-side) and IG1 relay No.2 terminal A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Inspect the METER1 10 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 No.1 terminal C and IG1 relay No.2 terminal A. 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 10.
6	INSPECT START STOP UNIT CONNECTOR • 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.
6		No	Repair or replace the connector, then go to Step 10.
7	INSPECT FOR OPEN CIRCUIT IN START STOP UNIT CIRCUIT • Verify that the IG1 relay No.1 is removed. • Verify that the start stop unit connector is disconnected. • Inspect for continuity between IG1 relay No.1 terminal E (wiring harness-side) and start stop unit terminal 2S (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay No.1 terminal E 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 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 10.
8	INSPECT FOR SHORT TO GROUND IN IG1 RELAY No.2 CIRCUIT • Verify that the IG1 relay No.2 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 No.2 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 IG1 relay No.2 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 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. Go to Step 10.
8		No	Go to the next step.
9	INSPECT FOR OPEN CIRCUIT IN IG1 RELAY No.2 CIRCUIT • Verify that the IG1 relay No.2 is removed. • Verify that the start stop unit connector is disconnected. • Inspect for continuity between IG1 relay No.2 terminal C (wiring harness-side) and start stop unit terminal 1B (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
9		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 No.2 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.
10	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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 1 s or more. • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
10		No	Go to the next step.
11	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].)
11		No	DTC troubleshooting completed.