Problem Symptoms Table
AFI SYSTEM
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Engine does not crank (does not start) | 1. Starter | INSPECTION |
| 2. STARTER relay | STARTER RELAY | |
| 3. Park/neutral position switch (2WD) | PARK / NEUTRAL POSITION SWITCH | |
| 4. Park/neutral position switch (4WD) | PARK/NEUTRAL POSITION SWITCH | |
| No initial combustion (does not start) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. ECM | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| No complete combustion (does not start) | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Difficult to start (engine cranks normally) | 1. Starter signal circuit | DTC P0617 STARTER RELAY CIRCUIT HIGH |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. Compression | ON-VEHICLE INSPECTION | |
| Difficult to start with cold engine | 1. Starter signal circuit | DTC P0617 STARTER RELAY CIRCUIT HIGH |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Difficult to start with hot engine | 1. Starter signal circuit | DTC P0617 STARTER RELAY CIRCUIT HIGH |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| High engine idle speed (poor idling) | 1. A/C signal circuit (Compressor circuit) | COMPRESSOR CIRCUIT |
| 2. ECM power source circuit | ECM POWER SOURCE CIRCUIT | |
| Low engine idle speed (poor idling) | 1. A/C signal circuit (Compressor circuit) | COMPRESSOR CIRCUIT |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Rough idling (poor idling) | 1. Compression | ON-VEHICLE INSPECTION |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Hunting (poor idling) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Hesitation/Poor acceleration (poor driveability) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. A/T faulty (2WD) | U241E AUTOMATIC TRANSAXLE -- HIGHLANDER | |
| 3. A/T faulty (4WD) | U140F AUTOMATIC TRANSAXLE -- HIGHLANDER | |
| Surging (poor driveability) | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls soon after starting | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls during A/C operation | 1. A/C signal circuit (Compressor circuit) | COMPRESSOR CIRCUIT |
| 2. ECM | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Unable to refuel/Difficult to refuel | ORVR system | - |