Auto Idle Stop System Symptom Troubleshooting Index (With Auto Idle Stop System) (2018 2019 2020)

When the vehicle has one of these symptoms, do the diagnostic procedure for the symptom, until you find the cause.

Auto Idle Stop System Symptom Troubleshooting Index

Symptom	Diagnostic procedure	Also check for
Auto idle stop system does not operate	Inspect the auto idle stop system . Troubleshoot the auto idle stop system (Auto idle stop system does not operate) .
Auto idle stop system indicator (amber) blinks	Troubleshoot the auto idle stop system (Auto idle stop system indicator blinks) .
Auto idle stop system indicator (green/amber) does not come on	Troubleshoot the auto idle stop system (Auto idle stop system indicator does not come on) .
Idle stop time is short	Brake booster leaks : Check the leakage from the following parts, and replace it if necessary. NOTE: Time that the idling stop operates shortens because it becomes impossible to maintain airtight of the negative pressure line when a small leakage is in the following parts. The following symptoms appear when there is a leakage in following parts. (Small leakage: Idle stop time is short) (Large leakage: Idle stop does not operate) Check valve (built into the vacuum line) Vacuum hose, pipe Vacuum tube, seal rubber (between the brake booster and the brake booster pressure sensor) Brake booster Rod seal or O-ring, or secondary cup of master cylinder Brake booster pressure sensor If equipped, check the cold storage evaporator installation . Troubleshoot the auto idle stop system .