LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 1987 >> 780 AW71 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH LH (Non Turbo) >> Testing >> Injector Circuits
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Injector Circuits

  1. On 2.3L models, turn ignition off. Connect an ohmmeter between pump relay terminal No. 87 and ECU terminal No. 13. Correct resistance should be approximately 4 ohms.
  2. On 2.8L models, turn ignition off. Connect an ohmmeter between control unit terminal No. 13 and terminal No. 9 of 25-terminal connector. Correct resistance should be approximately 2.6-2.7 ohms.
  3. On 2.3L models, if meter shows approximately 5.3 ohms, either an injector or injector wire is defective. If meter reads approximately 8 ohms, 2 injectors or injector wires are defective. If meter shows 16 ohms, 3 injectors or injector wires are defective.
  4. On 2.8L models, if meter shows approximately 3.2 ohms, either an injector or injector wire is defective. If meter reads approximately 4 ohms, 2 injectors or injector wires are defective. If meter shows 5.3 ohms, 3 injectors or injector wires are defective.
  5. On all models, injectors may be tested separately. Each injector should have a resistance of 16 ohms.
scientia non olet · About LEMON Manuals