INTRODUCTION
"PIN VOLTAGE CHARTS" are supplied (where available) to speed up the diagnostic process. By checking pin voltages at the electronic control unit, it is possible to determine if the control unit is receiving and transmitting proper voltage signals. Charts may also help determine if control unit harness has shorts or opens.
PORT FUEL INJECTION (PFI)
- ECU circuits are checked at the ECU connector with ignition in one or more of the following conditions: ignition off, ignition on (engine off), or with ignition on and engine running. Test each terminal between indicated terminal No. and body ground. Use wire color to help identify terminal. To test pin voltage, carefully backprobe terminal at harness side of ECU connector.
- If specified volt/ohm reading is not found, test and repair or replace circuit or affected component. Retest circuit to verify repair has been made. All tests are with ECU harness connected unless noted.
