FI SYSTEM DIAGNOSIS 4-77 “C36” (P1764), “C37” (P1765), “C38” (P1766) or “C39” (P1767) SECOND- ARY FUEL INJECTOR CIRCUIT MALFUNCTION DETECTED CONDITION POSSIBLE CAUSE Some failure exists in the fuel injector signal in a • Injector circuit open or short high load, high revolution condition. • Injector malfunction • ECM malfunction ECM Fuel pump relay Y/R To engine #12 Lg stop switch #22 Lg/W #32 Lg/G #42 Lg/BI #4 #3 #2 #1 Secondary fuel injector INSPECTION 1 E Step 1 L 1) Turn the ignition switch OFF. 2) Lift and support the fuel tank. (5-3) P 3) Check the injector coupler for loose or poor contacts. If OK, then measure the injector resistance. SAM 4) Disconnect the injector coupler and measure the resistance 1 between terminals. Injector resistance: 11 – 13 Ω at 20 °C (68 °F) (Terminal – Terminal)