Engine Controls - System/component Tests: Overview Lexus ES XV10 рестайлинг

FUEL CUT SYSTEM OPERATION

1. Remove "V" bank cover from top of engine. Start and warm engine to operating temperature. Turn A/C off. Use a stethoscope to listen for injector operating noise (or feel for vibration with finger).
2. Increase engine speed to at least the following specification. See «CONNECTING TACHOMETER»(ref-21745-S03433444672001010300000) under INTRODUCTION. 3500 RPM.
3. Release throttle lever. When throttle lever is released, injectors should stop operating until engine speed decreases to 1200 RPM.

FUEL INJECTOR OPERATION

Start engine. Using a stethoscope, listen for clicking from each injector (or feel injector for vibration). If clicking is not heard, check for loose connection at injector connector, or no voltage signal at injector connector.

FUEL PUMP OPERATION (USING DLC NO. 1)

Connect Jumper Wire (09843-18020) between terminals +B and FP of DLC No. 1. (Scheme 1) See COMPONENT LOCATIONS under INTRODUCTION N. Turn ignition on, engine off. Fuel pump is operating if pulsations can be felt in fuel pressure hose or if noise from fuel return can be heard.

Scheme 1

FUEL PUMP OPERATION (USING FUEL PUMP CONNECTOR)

Remove rear seat cushion and seat back. Disconnect 5-pin connector from fuel pump and sending unit assembly. Apply battery voltage across Blue/Black and White/Black wire terminals of 5-pin connector. Fuel pump is operating if pulsations can be felt in fuel pressure hose or if noise from fuel return can be heard.

IAC System Operation

1. Ensure engine is at normal operating temperature. Ensure idle speed is 650-750 RPM. See «CONNECTING TACHOMETER»(ref-21745-S03433444672001010300000) under INTRODUCTION. Shift transmission into Neutral. Turn A/C off. Connect Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. (Scheme 1)
2. If engine speed increases to about 1000 RPM for about 5 seconds, then decreases to idle speed of 650-750 RPM, IAC system is okay. If engine speed is not as specified, disconnect jumper wire from DLC No. 1, then go to next procedure.

IAC Valve Operation

Remove IAC valve. See COMPONENT LOCATIONS under INTRODUCTION. Using a 12-volt battery, connect positive lead to terminal +B of IAC valve. (Scheme 2) Connect negative lead to terminal RSC (valve should close), then to terminal RSO (valve should open). Replace IAC valve if it does not operate as specified.

Scheme 2

Scheme 3

A/C Idle-Up System Operation

1. Ensure air hoses leading to A/C idle-up valve are not clogged. See «COMPONENT LOCATIONS»(ref-21745-S16233931862001010300000) under INTRODUCTION. Run engine at operating temperature. Shift transmission into Neutral. Block wheels. Ensure idle speed is 650-750 RPM. See «CONNECTING TACHOMETER»(ref-21745-S03433444672001010300000) under INTRODUCTION. Turn A/C on.
2. In step 3), you will enable a diagnostic mode that causes the ECM to send signals to the A/C idle-up valve. Before enabling diagnostic mode, read the following description of what should happen after mode is enabled: First 3 Seconds Full idle-up should occur, causing engine speed to increase to about 1000 RPM. 3-15 Seconds Partial idle-up should occur, causing engine speed to decrease to about 700-800 RPM (at this point, record engine speed for comparison later). After 15 Seconds Normal idle-up should occur, causing engine speed to increase by no more than 100 RPM.
3. Enable diagnostic mode by connecting Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. (Scheme 1) I f engine speed increases and decreases as described in step 2), A/C idle-up system is okay.
4. If engine speed does not increase and decrease as described in step 2), repair system as follows, according to time frame in which system failed test: First 3 Seconds If engine speed decreased by about 100 RPM or more, or if engine idled roughly or stalled, check A/C idle-up valve. If A/C idle-up valve is okay, check for voltage at ECM. If voltage is present at ECM, replace ECM. 3-15 Seconds If engine speed did not decrease as specified, check A/C idle-up valve. If A/C idle-up valve is okay, check for voltage at ECM. If voltage is present at ECM, replace ECM. After 15 Seconds If engine speed increased by more than 100 RPM, adjust A/C idle-up valve as follows: Use a 4-mm hexagon wrench to turn screw on A/C idle-up valve. see scheme 24 Turn screw until engine speed is about 100 RPM more than engine speed that was previously recorded.