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 | See |
|---|---|---|
| Engine does not crank (does not start) | 1. Immobilizer system | SYSTEM DESCRIPTION |
| 2. Starter | INSPECTION | |
| 3. STARTER Relay | STARTER RELAY | |
| 4. Cranking holding function circuit | CRANKING HOLDING FUNCTION CIRCUIT | |
| 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 | INSPECTION | |
| 5. VC output circuit | VC OUTPUT CIRCUIT | |
| 6. ECM | ECM | |
| Difficult to start (engine cranks normally) | 1. Electronic Throttle Control System (ETCS) | DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. Ignition system | ON-VEHICLE INSPECTION | |
| 4. Spark plug | ON-VEHICLE INSPECTION | |
| 5. Compression | ON-VEHICLE INSPECTION | |
| 6. Injector | INSPECTION | |
| 7. VC output circuit | VC OUTPUT CIRCUIT | |
| Difficult to start with cold engine | 1. Cranking holding function circuit | CRANKING HOLDING FUNCTION CIRCUIT |
| 2. Electronic Throttle Control System (ETCS) | DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH | |
| 3. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 4. Spark plug | ON-VEHICLE INSPECTION | |
| 5. Ignition system | ON-VEHICLE INSPECTION | |
| 6. Injector | INSPECTION | |
| 7. Engine coolant temperature sensor | ENGINE COOLANT TEMPERATURE SENSOR | |
| Difficult to start with hot engine | 1. Cooling fan system | ON-VEHICLE INSPECTION |
| 2. Cranking holding function circuit | CRANKING HOLDING FUNCTION 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 | INSPECTION | |
| 8. Engine coolant temperature sensor | ENGINE COOLANT TEMPERATURE SENSOR | |
| High engine idle 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 | REMOVAL | |
| 6. ECM | ECM | |
| Low engine idle 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 | ON-VEHICLE INSPECTION | |
| 6. Injector | INSPECTION | |
| 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 | INSPECTION | |
| 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 | ON-VEHICLE INSPECTION | |
| 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 | INSPECTION | |
| 7. Acoustic Control Induction System (ACIS) | ACIS CONTROL CIRCUIT | |
| 8. PCV hose | ON-VEHICLE INSPECTION | |
| Hesitation/Poor acceleration (poor driveability) | 1. Injector | INSPECTION |
| 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) | ACIS CONTROL CIRCUIT | |
| 6. A/T faulty (U151E) | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 7. A/T faulty (U151F) | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 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 | INSPECTION | |
| 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. Crankshaft position sensor | CRANKSHAFT POSITION SENSOR | |
| 4. Spark plug | ON-VEHICLE INSPECTION | |
| 5. Ignition system | ON-VEHICLE INSPECTION | |
| 6. Injector | INSPECTION | |
| Engine stalls during A/C operation | 1. A/C signal circuit (Compressor circuit) | - |
| 2. ECM | ECM | |
| Unable/difficult to refuel | Refueling valve (canister) | - |
| Engine vibrates frequently when idling (Active Control) | Active control engine mount circuit | ACTIVE CONTROL ENGINE MOUNT SYSTEM |