2008 Lexus ES 350FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

When a malfunction is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshoot according to the priority order indicated in the table below.

SFI SYSTEM: 

PROBLEM SYMPTOMS CHART

Symptom Suspected Area Refer To
Engine does not crank (Does not start) 1. Immobilizer system HOW TO PROCEED WITH TROUBLESHOOTING
2. Cranking holding function circuit CRANKING HOLDING FUNCTION CIRCUIT
3. Starter signal circuit DTC P0617 STARTER RELAY CIRCUIT HIGH
4 Starter INSPECTION
5. STARTER relay STARTER RELAY
6. ECM power source circuit ECM POWER SOURCE CIRCUIT
7 ECM ECM
No initial combustion (Does not start) 1 ECM power source circuit ECM POWER SOURCE CIRCUIT
2. Ignition system ON-VEHICLE INSPECTION
3 Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
4 Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
5. Crank angle sensor CRANKSHAFT POSITION SENSOR
6. ECM ECM
Engine cranks normally but difficult to start 1 Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
2. VC Output Circuit VC OUTPUT CIRCUIT
3. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
4. Ignition system ON-VEHICLE INSPECTION
5. Spark plug ON-VEHICLE INSPECTION
6 Compression ON-VEHICLE INSPECTION
7. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
8 Crank angle sensor CRANKSHAFT POSITION SENSOR
Difficult to start with cold engine 1. Starter signal circuit DTC P0617 STARTER RELAY CIRCUIT HIGH
2 VC Output Circuit VC OUTPUT CIRCUIT
3. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
4. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
5. Spark plug ON-VEHICLE INSPECTION
6. Ignition system ON-VEHICLE INSPECTION
7. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
8. Engine coolant temperature sensor ENGINE COOLANT TEMPERATURE SENSOR
Difficult to start with warm engine 1. Starter signal circuit DTC P0617 STARTER RELAY CIRCUIT HIGH
2. VC Output Circuit VC OUTPUT CIRCUIT
3. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
4. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
5. Spark plug ON-VEHICLE INSPECTION
6. Ignition system ON-VEHICLE INSPECTION
7. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
8. Engine coolant temperature sensor ENGINE COOLANT TEMPERATURE SENSOR
High engine idling speed (Poor idling) 1. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
2. ECM power source circuit ECM POWER SOURCE CIRCUIT
3. A/C signal circuit (Compressor circuit) -
4 Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
5. PCV hose -
6 ECM ECM
Low engine idling speed (Poor idling) 1 Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
2. ECM power source circuit ECM POWER SOURCE CIRCUIT
3. A/C signal circuit (Compressor circuit) -
4. Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
5. PCV hose -
6. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
7. ECM ECM
Rough idling (Poor idling) 1. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
2. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
3. Ignition system ON-VEHICLE INSPECTION
4. Compression ON-VEHICLE INSPECTION
5. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
6. Spark plug ON-VEHICLE INSPECTION
7. Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
8. PCV hose -
Hunting (Poor idling) 1. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
2. ECM power source circuit ECM POWER SOURCE CIRCUIT
3. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
4. Spark plug ON-VEHICLE INSPECTION
5 Ignition system ON-VEHICLE INSPECTION
6 Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
7. Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT
8. PCV hose -
Hesitation/Poor acceleration (Poor driveability) 1. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
3. Ignition system ON-VEHICLE INSPECTION
4. Spark plug ON-VEHICLE INSPECTION
5. Air Intake Control System (AICS) AIR INTAKE CONTROL CIRCUIT
6. A/T faulty SYSTEM DESCRIPTION
Surging (Poor driveability) 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
2. Spark plug ON-VEHICLE INSPECTION
3. Ignition system ON-VEHICLE INSPECTION
4. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
Engine stalls soon after starting 1 Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT
2. Electronic Throttle Control System (ETCS) DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH
3. Crank angle sensor CRANKSHAFT POSITION SENSOR
4. Spark plug ON-VEHICLE INSPECTION
5. Ignition system ON-VEHICLE INSPECTION
6. Injector DTC P0300 RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0301 CYLINDER 1 MISFIRE DETECTED; DTC P0302 CYLINDER 2 MISFIRE DETECTED; DTC P0303 CYLINDER 3 MISFIRE DETECTED; DTC P0304 CYLINDER 4 MISFIRE DETECTED; DTC P0305 CYLINDER 5 MISFIRE DETECTED; DTC P0306 CYLINDER 6 MISFIRE DETECTED
Engine stalls during A/C operation 1. A/C signal circuit -
2. ECM ECM
Unable/difficult to refuel Refueling valve (canister) CANISTER
Engine vibrates frequently when idling (Active Control engine Mount (ACM) system does not operate) Active control engine mount circuit SYSTEM DESCRIPTION
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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