LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 1988 >> 4Runner Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> High Altitude Compensation System >> System Testing >> HAC System >> HAC System Test (Fuel Injected)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

HAC System Test (Fuel Injected)

  1. On Pickup and 4Runner models, disconnect HAC valve electrical connector. Connect an ohmmeter between White wire terminal and Green/Blue wire terminal of valve connector. Resistance should be 3000-5000 ohms. Check resistance between White wire terminal and Brown/Black wire terminal. Resistance should be 2000-4000 ohms. Check resistance between Green/Black wire terminal and Brown/Black wire terminal. Resistance should be 400-1200 ohms. If not within specifications, replace HAC valve.
  2. On Supra models, disconnect HAC valve electrical connector. HAC is located behind glove box. Connect an ohmmeter between Blue/Red wire terminal and Red/Black wire terminal of valve connector. Resistance should be 700-860 ohms. Check resistance between Blue/Red wire terminal and Brown wire terminal. Resistance should be 2200-3300 ohms. Check resistance between Red/Black wire terminal and Brown wire terminal. Resistance should be 2900-4200 ohms. If not within specifications, replace HAC valve.
scientia non olet · About LEMON Manuals