EFI SYSTEM — Troubleshooting SYMPTOM — HIGH ENGINE IDLE SPEED (NO DROP) CHECK ACCELERATOR LINKAGE | OK | CHECK DIAGNOSIS SYSTEM Check for output of diagnostic code. (See page FI-22) | Normal code | CHECK ISC SYSTEM | OK | CHECK THROTTLE POSITION SENSOR | OK | CHECK FUEL PRESSURE (See page FI-45) | OK | CHECK COLD START INJECTOR (See page FI-49) | OK | CHECK INJECTORS (See page FI-53) | OK | CHECK EFI ELECTRONIC CIRCUIT USING VOLT/OHMMETER BAD — Linkage — stuck dash pot system Malfunction code(s) — Diagnostic code(s) (See page FI-25) BAD — 1. Wiring connection (Air con, Throttle position sensor — ECU) 2. ISC valve 3. Air conditioner switch BAD — Throttle body BAD — Fuel pressure regulator — high pressure BAD — Cold start injector — leakage BAD — Injectors — leakage, injection quantity BAD — 1. Wiring connection 2. Power to ECU (1) Fusible link (2) EFI fuse, No. 2 main relay 3. Air flow meter 4. Water temp. sensor 5. Air temp. sensor 6. Injection signal circuit (1) Injector wirings (2) Resistor (3) ECU