Lexus ES: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Engine does not crank (Does not start) | Battery | |
| ST relay | | |
| Starter assembly | | |
| Starter signal circuit | | |
| Smart access system with push button start (for start function) | | |
| VC output circuit (ECM 5 V output) | | |
| Park/neutral position switch assembly | | |
| No initial combustion (Does not start) | Immobiliser system | |
| ECM power source circuit | | |
| VC output circuit (ECM 5 V output) | | |
| Ignition system | | |
| Fuel pump control circuit | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Crankshaft position sensor | | |
| Intake system | | |
| Valve timing | | |
| No. 1 valve rocker arm sub-assembly* | | |
| Engine cranks normally but difficult to start | ECM power source circuit | |
| Flow chart [Engine difficult to start] | | |
| Throttle body with motor assembly | | |
| Fuel pump assembly (for high pressure side) | | |
| Fuel pump (for low pressure side) | | |
| Engine coolant temperature sensor | | |
| Fuel pump control circuit | | |
| Ignition system | | |
| Spark plug | | |
| Compression | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Crankshaft position sensor | | |
| Intake system | | |
| Valve timing | | |
| No. 1 valve rocker arm sub-assembly* | | |
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | |
| Ignition system | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Crankshaft position sensor | | |
| Intake system | | |
| Valve timing | | |
| High engine speed | Throttle body with motor assembly | |
| ECM power source circuit | | |
| PCV hose | | |
| PCV system | | |
| Low engine speed (Poor idle) | Fuel pump control circuit | |
| Throttle body with motor assembly | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Fuel pump assembly (for high pressure side) | | |
| PCV hose | | |
| PCV system | | |
| Intake system | | |
| Rough idle | Flow chart [Rough idling] | |
| Throttle body with motor assembly | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Fuel pump assembly (for high pressure side) | | |
| Ignition system | | |
| Compression | | |
| Fuel pump control circuit | | |
| Spark plug | | |
| Intake system | | |
| Valve timing | | |
| No. 1 valve rocker arm sub-assembly* | | |
| Hunting (Poor idle) | Throttle body with motor assembly | |
| ECM power source circuit | | |
| Fuel pump control circuit | | |
| Spark plug | | |
| Intake system | | |
| Drive start control | | |
| Hesitation/Poor acceleration (Poor driveability) | Port fuel injector assembly | |
| Direct fuel injector assembly | | |
| Fuel pump control circuit | | |
| Fuel pump assembly (for high pressure side) | | |
| Ignition system | | |
| Spark plug | | |
| Intake system | | |
| Valve timing | | |
| No. 1 valve rocker arm sub-assembly* | | |
| Brake override system | | |
| Drive start control | | |
| Lack of power | Flow chart [Lack of power] | |
| Surging (Poor driveability) | Fuel pump control circuit | |
| Spark plug | | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| No. 1 valve rocker arm sub-assembly* | | |
| Engine stalls soon after starting | Flow chart [Engine stalls] | |
| Fuel pump control circuit | | |
| Throttle body with motor assembly | | |
| Crankshaft position sensor | | |
| Ignition system | | |
| Fuel pump assembly (for high pressure side) | | |
| Intake system | | |
| Valve timing | | |
| Engine stalls soon after slow down | Flow chart [Engine stalls] | |
| Port fuel injector assembly | | |
| Direct fuel injector assembly | | |
| Throttle body with motor assembly | | |
| ECM | | |
| Crankshaft position sensor | | |
| Ignition system | | |
| MIL (Malfunction Indicator Lamp) malfunction | MIL Circuit | |
| Meter/Gauge system | | |
| Unable/difficult to refuel | Fuel system (canister, refueling valve, roll over valve, fuel tank, etc.) | - |
| Drive mode does not change | Drive mode switch circuit | |
| Engine vibrates frequently when idling (Active control engine mount system) | Active control engine mount circuit | |
HINT:
*: Check "Fuel Cut Elapsed Time" in the Data List. If the elapsed time is over 0 sec, then the engine speed is high (the engine speed at which fuel cut occurs + 500 rpm or more). In this situation, there is a possibility that a No. 1 valve rocker arm sub-assembly will become loose and malfunction, check that the No. 1 valve rocker arm sub-assemblies are properly installed.
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