Inspecting Fuel System
NOTE:
After each repair, perform TEST VER-1
.
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
.
- Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. If throttle is okay, go to next step.
- Using DRB, read Throttle Position Sensor (TPS) voltage. If voltage is more than 1.5 volts, go to step 3). If voltage is less than 1.5 volts, use DRB to actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-5A . If fuel pump operation can be heard, go to step 4).
- If voltage is more than 1.5 volts in step 2), disconnect TPS connector. Inspect terminals. Repair as required. If terminals are okay, replace TPS.
- If fuel pump operation could be heard in step 2), turn ignition off. Ensure fuel tank is at least 1/4" full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Go to next step.
- Using DRB, actuate fuel system. Read fuel pressure gauge reading. If fuel pressure is more than 60 psi, go to TEST NS-4B . If fuel pressure is less than 60 psi, go to next step.
- If fuel pressure is less than 50 psi, go to TEST NS-4A . If fuel pressure is more than 50 psi and vehicle initially started and stalled repeatedly, go to TEST NS-7A . If fuel pressure is more than 50 psi and vehicle initially did not stall repeatedly, go to TEST NS-3A .