Idle Stop Time Is Short

Diagnostic procedure

• 1. Brake booster leaks: Check the leakage from the following parts, Brake Booster Test 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 (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
• 2. If equipped, Check the cold storage evaporator installation - Go to: Evaporator Core - Removal and Installation (1234yf) .
• 3. Troubleshoot the auto idle stop system - Go to: Auto Idle Stop System Symptom Troubleshooting - Auto idle stop system does not operate .