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 | See |
|---|---|---|
| Engine does not crank (Does not start) | Battery | Refer to ON-VEHICLE INSPECTION |
| Starter | Refer to INSPECTION | |
| STA relay (starter relay) | Refer to INSPECTION - Step 1 | |
| Clutch start switch assembly | Refer to INSPECTION | |
| Park/neutral position switch assembly | Refer to PROCEDURE - Step 2 | |
| Starter signal circuit | Refer to Starter Signal Circuit | |
| No initial combustion (Does not start) | ECM power source circuit | Refer to ECM Power Source Circuit |
| Crankshaft position sensor | Refer to INSPECTION | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Fuel pump control circuit | Refer to Fuel Pump Control Circuit | |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| Valve timing | Refer to PROCEDURE - Step 4 | |
| VC output circuit (ECM 5 V output) | Refer to VC Output Circuit | |
| VVT sensor | Refer to INSPECTION PROCEDURE | |
| Starter signal circuit | Refer to Starter Signal Circuit | |
| Engine immobilizer system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| ECM | Refer to TERMINALS OF ECM | |
| Engine cranks normally but difficult to start | Fuel pump control circuit | Refer to Fuel Pump Control Circuit |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Starter signal circuit | Refer to Starter Signal Circuit | |
| Engine coolant temperature sensor | Refer to INSPECTION | |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Spark plug | Refer to ON-VEHICLE INSPECTION - Step 2 | |
| Throttle with motor body assembly | Refer to INSPECTION | |
| Compression | Refer to ON-VEHICLE INSPECTION - Step 9 | |
| Incomplete intermittent combustion occurs (Does not start) | Fuel pump control circuit | Refer to Fuel Pump Control Circuit |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Fuel line | Refer to ON-VEHICLE INSPECTION | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| Fuel injector assembly | Refer to INSPECTION - Step 1 | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Starter signal circuit | Refer to Starter Signal Circuit | |
| Crankshaft position sensor | Refer to INSPECTION | |
| VVT sensor | Refer to INSPECTION PROCEDURE | |
| Valve timing | Refer to PROCEDURE - Step 4 | |
| High engine idling speed | Throttle with motor body assembly | Refer to INSPECTION |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| A/C signal circuit (compressor circuit) | Refer to PROBLEM SYMPTOMS TABLE | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Engine coolant temperature sensor | Refer to INSPECTION | |
| PCV valve and hose | Refer to COMPONENTS | |
| ACIS control circuit | Refer to ACIS Control Circuit | |
| Low engine idling speed (Poor idling) | Throttle with motor body assembly | Refer to INSPECTION |
| A/C signal circuit (compressor circuit) | Refer to PROBLEM SYMPTOMS TABLE | |
| Fuel pump control circuit | Refer to Fuel Pump Control Circuit | |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| PCV valve and hose | Refer to COMPONENTS | |
| ACIS control circuit | Refer to ACIS Control Circuit | |
| Rough idling | Compression | Refer to ON-VEHICLE INSPECTION - Step 9 |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Spark plug | Refer to ON-VEHICLE INSPECTION - Step 2 | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Fuel pump control circuit | Refer to Fuel Pump Control Circuit | |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Fuel line | Refer to ON-VEHICLE INSPECTION | |
| Throttle with motor body assembly | Refer to INSPECTION | |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| Purge VSV | Refer to INSPECTION | |
| Air fuel ratio sensor | Refer to INSPECTION | |
| Heated oxygen sensor | Refer to INSPECTION | |
| Mass air flow meter sub-assembly | Refer to ON-VEHICLE INSPECTION | |
| Knock sensor (for 2WD) | Refer to INSPECTION | |
| Knock sensor (for 4WD and Pre-Runner) | Refer to INSPECTION | |
| PCV valve and hose | Refer to COMPONENTS | |
| ACIS control circuit | Refer to ACIS Control Circuit | |
| External part malfunction (Increase in load: A/C system, etc.) | - | |
| Hunting (Poor idling) | Throttle with motor body assembly | Refer to INSPECTION |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| Air fuel ratio sensor | Refer to INSPECTION | |
| PCV valve and hose | Refer to COMPONENTS | |
| Mass air flow meter sub-assembly | Refer to ON-VEHICLE INSPECTION | |
| ACIS control circuit | Refer to ACIS Control Circuit | |
| Hesitation/ Poor acceleration | Fuel pump control circuit | Refer to Fuel Pump Control Circuit |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Fuel line | Refer to ON-VEHICLE INSPECTION | |
| Spark plug | Refer to ON-VEHICLE INSPECTION - Step 2 | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| Fuel injector assembly | Refer to INSPECTION - Step 1 | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Mass air flow meter sub-assembly | Refer to ON-VEHICLE INSPECTION | |
| Throttle with motor body assembly | Refer to INSPECTION | |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| Valve timing | Refer to PROCEDURE - Step 4 | |
| Compression | Refer to ON-VEHICLE INSPECTION - Step 9 | |
| Brake override system | Refer to Brake Override System | |
| Surging (Poor driveability) | Spark plug | Refer to ON-VEHICLE INSPECTION - Step 2 |
| Fuel pump control circuit | Refer to Fuel Pump Control Circuit | |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| Fuel injector assembly | Refer to INSPECTION - Step 1 | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Mass air flow meter sub-assembly | Refer to ON-VEHICLE INSPECTION | |
| Variable Valve Timing (VVT) system | Refer to INSPECTION PROCEDURE | |
| Compression | Refer to ON-VEHICLE INSPECTION - Step 9 | |
| Engine stalls soon after starting | Fuel pump control circuit | Refer to Fuel Pump Control Circuit |
| Fuel suction with pump and gauge tube assembly | Refer to INSPECTION | |
| Spark plug | Refer to ON-VEHICLE INSPECTION - Step 2 | |
| Ignition system | Refer to ON-VEHICLE INSPECTION | |
| Fuel injector circuit | Refer to Fuel Injector Circuit | |
| Fuel injector assembly | Refer to INSPECTION - Step 1 | |
| ECM power source circuit | Refer to ECM Power Source Circuit | |
| Mass air flow meter sub-assembly | Refer to ON-VEHICLE INSPECTION | |
| Variable Valve Timing (VVT) system | Refer to INSPECTION PROCEDURE | |
| Throttle with motor body assembly | Refer to INSPECTION | |
| Intake system | Refer to ON-VEHICLE INSPECTION | |
| PCV valve and hose | Refer to COMPONENTS | |
| Compression | Refer to ON-VEHICLE INSPECTION - Step 9 | |
| Engine stalls during A/C operation | A/C signal circuit (Compressor circuit) | Refer to PROBLEM SYMPTOMS TABLE |
| ECM | Refer to TERMINALS OF ECM | |
| Unable/difficult to refuel | Fuel system (canister, roll over valve, fuel tank, etc) | Refer to INSPECTION - Step 1 |