LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 1987 >> Van Base, Van Window, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (TCCS System) >> Diagnosis & Testing >> Component Testing >> Idle Speed Control (ISC) Valve

Idle Speed Control (ISC) Valve

WARNING: This page is about a different car, the 1987 Toyota Supra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure resistance between "B1" terminal and "S1" or "S" terminal, Also measure resistance between "B2" terminal and "S2" or "S4" terminal. If resistance is not as specified in table, replace ISC valve.
  2. Apply battery voltage to terminal "B1" and terminal "B2" while repeatedly grounding terminals "S1", "S2", "S", "S4" and "S1" in sequence to cause valve to close. See Fig 1.
  3. Apply battery voltage to terminals "B1" and "B2" while repeatedly grounding terminals "S4", "S", "S2", "S1" and "S4" in sequence to cause valve to open. Replace valve if not operating properly.
ISC VALVE RESISTANCE SPECIFICATIONS

Terminals Ohms
B1 - S1 Or S 10-30
B2 - S2 Or S4 10-30
Fig 1: Checking ISC Valve Resistance
G74058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals