Engine Controls - Tests W/o Codes: Other Lexus ES XV20

Engine Does Not Crank

1. Check starter.
2. Check starter relay.

No Initial Combustion

1. Check ECM power source circuit with ignition on.
2. Check fuel pump control circuit.
3. Check engine immobilizer system (if equipped).

No Complete Combustion

1. Check fuel pump control circuit.

Difficult To Start, Cranks Normal

1. Check starter signal circuit.
2. Check fuel pump control circuit.
3. Check engine compression.

Difficult To Start When Cold

1. Check starter signal circuit.
2. Check fuel pump control circuit.

Difficult To Start When Hot

1. Check starter signal circuit.
2. Check fuel pressure control VSV circuit.
3. Check fuel pump control circuit.

High Idle Speed

1. Check A/C compressor signal circuit.
2. Check ECM power source circuit with ignition on.

Low Idle Speed

1. Check A/C compressor signal circuit.
2. Check fuel pump control circuit.

Rough Idle

1. Check engine compression.
2. Check fuel pump control circuit.

Surging

1. Check ECM power source circuit with ignition on.
2. Check fuel pump control circuit.

Hesitation/Poor Acceleration

1. Check fuel pump control circuit.
2. Check for faulty automatic transmission (electronics).

1. Check fuel pump control circuit.

Engine Stall After Start

1. Check fuel pump control circuit.
2. Check engine immobilizer system (if equipped).

Intermittent Simulation

To reproduce the conditions creating an intermittent fault, use the following methods

1. Lightly vibrate component. See «VIBRATION METHOD»(ref-22513-S41133890582001010300000) .
2. Heat component. See «HEATING METHOD»(ref-22513-S05840461702001010300000) .
3. Wiggle or bend wiring harness. See «VIBRATION METHOD»(ref-22513-S41133890582001010300000) .
4. Spray component with water. See «WATER SPRINKLING METHOD»(ref-22513-S16326493642001010300000) .
5. Remove vacuum from component.
6. Apply vacuum to component.

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for Diagnostic Trouble Codes (DTCs). Use test results to identify a faulty component or circuit.

WATER SPRINKLING METHOD

Spray outside of vehicle and front of radiator with water while checking for a malfunction to exist. DO NOT spray water directly into engine compartment. The temperature and humidity may be changed by spraying water onto the front of the radiator. DO NOT spray electronic components directly with water.