DTC B1087:88 [FRONT BODY CONTROL MODULE (FBCM)]

id0902p2006700

Description

LIN communication error

Detection condition

•  LIN bus communication line malfunction detected for 1 s or more

Fail-safe function

Not applicable

Possible cause

•  Malfunction in LIN bus communication line

―  DC-DC converter terminal C—Front body control module (FBCM) terminal 2H (With i-stop, without i-ELOOP)

―  Current sensor terminal B—Front body control module (FBCM) terminal 2E (With i-stop system)

•  Front body control module (FBCM) malfunction

Description	LIN communication error
Detection condition	• LIN bus communication line malfunction detected for 1 s or more
Fail-safe function	Not applicable
Possible cause	• Malfunction in LIN bus communication line ― DC-DC converter terminal C—Front body control module (FBCM) terminal 2H (With i-stop, without i-ELOOP) ― Current sensor terminal B—Front body control module (FBCM) terminal 2E (With i-stop system) • Front body control module (FBCM) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs AGAIN • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 1 s or more. • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the same DTC displayed?	Yes	LIN communication line can be considered the cause. • Refer to the wiring diagram and verify whether or not there is a common connector between following terminals: ― DC-DC converter terminal C—Front body control module (FBCM) terminal 2H (With i-stop, without i-ELOOP) ― Current sensor terminal B—Front body control module (FBCM) terminal 2E (With i-stop system) 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. • Go to the next step.
1		No	Go to Step 3.
2	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear the DTC for the front body control module (FBCM) using the M-MDS. (See CLEARING DTC [FRONT BODY CONTROL MODULE (FBCM)].) • Switch the ignition ON (engine off or on) and wait for 1 s or more. • Retrieve the front body control module (FBCM) DTCs using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) Go to the next step.
2		No	Go to the next step.
3	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 [FRONT BODY CONTROL MODULE (FBCM)].)
3		No	DTC troubleshooting completed.