SYMPTOM — HIGH ENGINE IDLE SPEED (NO DROP) CHECK ACCELERATOR LINKAGE BAD Linkage — Stuck OK CHECK DIAGNOSIS SYSTEM Check for output of diagnostic code. (See page FI-23) Malfunction code(s) Diagnostic code(s) (See page FI-26) Normal code CHECK ISC SYSTEM BAD 1. Wiring connection Air con. Throttle position sensor—ECU) 2. ISC valve 3. Air conditioner switch OK CHECK THROTTLE POSITION SENSOR BAD Throttle body OK CHECK FUEL PRESSURE (See page FI-71) BAD Fuel pressure regulator — High pressure OK CHECK COLD START INJECTOR (See page FI-77) BAD Cold start injector — Leakage OK CHECK INJECTORS (See page FI-83) BAD Injectors — Leakage, Injection quality OK CHECK EFI ELECTRONIC CIRCUIT USING VOLT/OHMMETER (See pages FI-30, 49) BAD 1. Wiring connection 2. Power to ECU (1) Fusible links (2) Fuses (EFI 15A, IGN 7.5A) (3) EFI main relay 3. Air flow meter 4. Water temp. sensor 5. Air temp. sensor 6. Injection signal circuit (1) Fusible links (2) Resistor (7M-GTE) (3) ECU