Suspected area

Engine does not crank (does not start)

1. Cranking holding function circuit

CRANKING HOLDING FUNCTION CIRCUIT

2. Starter

STARTER

2007 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Sequoia

3. Starter relay

STARTER RELAY

4. VC output circuit

VC OUTPUT CIRCUIT

No initial combustion (does not start)

1. ECM power source circuit

ECM POWER SOURCE CIRCUIT

2. VC output circuit

VC OUTPUT CIRCUIT

3. Fuel pump control circuit

FUEL PUMP CONTROL CIRCUIT

4. ECM

ECM

No complete combustion (does not start)

1. 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

ENGINE

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

ENGINE

2. Fuel pump control circuit

FUEL PUMP CONTROL CIRCUIT

3. Mass air flow meter

MASS AIR FLOW METER

Hunting (poor idling)

1. ECM power source circuit

ECM POWER SOURCE CIRCUIT

2. A/T faulty (2WD)

HOW TO PROCEED WITH

TROUBLESHOOTING

3. A/T faulty (4WD)

HOW TO PROCEED WITH

TROUBLESHOOTING

Hesitation/Poor acceleration (Poor driveability)

1. ECM power source circuit

ECM POWER SOURCE CIRCUIT

2. A/T faulty (2WD)

HOW TO PROCEED WITH

TROUBLESHOOTING

3. A/T faulty (4WD)

HOW TO PROCEED WITH

TROUBLESHOOTING

4. Mass air flow meter

MASS AIR FLOW METER

Engine stalls during A/C operation

1. A/C signal circuit (compressor circuit)

COMPRESSOR CIRCUIT

2007 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Sequoia

2. ECM

ECM

Unable/Difficult to refuel

1. ORVR system

-

Surging (Poor driveability)

1. Fuel pump control circuit

FUEL PUMP CONTROL CIRCUIT

2. Mass air flow meter

MASS AIR FLOW METER

Engine stalls soon after starting

1. Fuel pump control circuit

FUEL PUMP CONTROL CIRCUIT

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