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Home >> Toyota >> 2007 >> Highlander Limited, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (3MZ-FE) (Except Hybrid) >> SFI System >> Problem Symptoms Table
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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 HOW TO PROCEED WITH TROUBLESHOOTING
2. Starter INSPECTION
3. STARTER Relay STARTER RELAY
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. Crankshaft position sensor CRANKSHAFT POSITION SENSOR 
6. ECM TERMINALS OF ECM 
Difficult to start (engine cranks normally) 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
3. Ignition system ON-VEHICLE INSPECTION
4. Spark plug INSPECTION
5. Compression ON-VEHICLE INSPECTION
6. Injector INSPECTION
7. Crankshaft position sensor CRANKSHAFT POSITION SENSOR 
Difficult to start with cold engine 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
3. Spark plug INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Injector INSPECTION
6. Engine coolant temperature sensor ENGINE COOLANT TEMPERATURE SENSOR 
Difficult to start with hot engine 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
2. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
3. Spark plug INSPECTION
4. Ignition system ON-VEHICLE INSPECTION
5. Injector INSPECTION
6. Engine coolant temperature sensor ENGINE COOLANT TEMPERATURE SENSOR 
High engine idle speed (poor idling) 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
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 TERMINALS OF ECM 
Low engine idle speed (poor idling) 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
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 INSPECTION
7. ECM TERMINALS OF ECM 
Rough idling (poor idling) 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
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 INSPECTION
7. Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT 
8. PCV hose -
Hunting (poor idling) 1. Electronic Throttle Control System (ETCS) DTC P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
2. ECM power source circuit ECM POWER SOURCE CIRCUIT 
3. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
4. Spark plug INSPECTION
5. Ignition system ON-VEHICLE INSPECTION
6. Injector INSPECTION
7. Acoustic Control Induction System (ACIS) ACIS CONTROL CIRCUIT 
8. PCV hose -
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 INSPECTION
5. Air Intake Control System (ACIS) ACIS CONTROL CIRCUIT 
6. A/T faulty (2WD) U151F AUTOMATIC TRANSAXLE -- HIGHLANDER
7. A/T faulty (4WD) U151E AUTOMATIC TRANSAXLE -- HIGHLANDER
Surging (poor driveability) 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
2. Spark plug 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 P0120 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT; DTC P0122 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT LOW INPUT; DTC P0123 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT; DTC P0222 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE / PEDAL POSITION SENSOR / SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE / PEDAL POSITION SENSOR / SWITCH "A" / "B" VOLTAGE CORRELATION 
3. Crankshaft position sensor CRANKSHAFT POSITION SENSOR 
4. Spark plug 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 TERMINALS OF ECM 
Unable/difficult to refuel Refueling valve (canister) -
Engine vibrates frequently when idling (Active Control) Active control engine mount circuit ACIS CONTROL CIRCUIT 
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