When the malfunction is not confirmed in the diagnostic trouble code check and the problem still can not be confirmed in the basic inspection, use this table and troubleshoot according to the priority order given below.

SFI SYSTEM

PROBLEM SYMPTOMS CHART

Symptom	Suspected area
Engine does not crank (Does not start)	1. Immobilizer System. See ENGINE IMMOBILIZER
	2. Generator
	3. Hybrid system. See HYBRID VEHICLE CONTROL (P310)
	4. Park/neutral position switch
No initial combustion (Does not start)	1. ECM (Included in HV Control ECU) power source circuit. See ECM POWER SOURCE CIRCUIT
	2. FUEL PUMP CONTROL CIRCUIT
	3. ECM (Included in HV Control ECU)
Engine cranks normally but difficult to start	1. FUEL PUMP CONTROL CIRCUIT
Engine cranks normally but difficult to start	2. Compression. See ENGINE
Difficult to start with cold engine	1. Ignition system. See IGNITION SYSTEM
	2. Spark plug. See IGNITION SYSTEM
	3. FUEL PUMP CONTROL CIRCUIT
	5. Injector. See FUEL INJECTOR
Difficult to start with warm engine	1. Injector. See FUEL INJECTOR
	2. Ignition system. See IGNITION SYSTEM
	3. Spark plug. See IGNITION SYSTEM
	4. FUEL PUMP CONTROL CIRCUIT
High engine idle speed (Poor idling)	1. ECM (Included in HV Control ECU) power source circuit
	2. A/C signal circuit (compressor circuit)
	3. Electronic throttle control system
	4. Air induction system
	5. PCV hose
Low engine idle speed (Poor idling)	1. A/C signal circuit (compressor circuit)
	2. FUEL PUMP CONTROL CIRCUIT
	3. Electronic throttle control system
	4. Air induction system
	5. PCV hose
Rough idling (Poor idling)	1. Compression. See ENGINE
	2. FUEL PUMP CONTROL CIRCUIT
	3. Electronic throttle control system
	4. Air induction system
	5. PCV hose
Hunting (Poor idling)	1. ECM (Included in HV Control ECU) power source circuit
	2. FUEL PUMP CONTROL CIRCUIT
	3. Spark plug. See IGNITION SYSTEM
	4. Ignition system. See IGNITION SYSTEM
	5. Injector. See FUEL INJECTOR
	6. Electronic throttle control system
	7. Air induction system
	8. PCV hose
Hesitation/ Poor acceleration (Poor driveability)	1. FUEL PUMP CONTROL CIRCUIT
	2. Spark plug. See IGNITION SYSTEM
	3. Ignition system. See IGNITION SYSTEM
	4. Injector. See FUEL INJECTOR
Surging (Poor driveability)	1. Spark plug. See IGNITION SYSTEM
	2. FUEL PUMP CONTROL CIRCUIT
	3. Ignition system. See IGNITION SYSTEM
	4. Injector. See FUEL INJECTOR
Engine stalls soon after starting	1. FUEL PUMP CONTROL CIRCUIT
	2. Spark plug. See IGNITION SYSTEM
	3. Ignition system. See IGNITION SYSTEM
	4. Injector. See FUEL INJECTOR
Engine stalls during A/C operation	1. A/C signal circuit (Compressor circuit)
Engine stalls during A/C operation	2. ECM (Included in HV Control ECU)
Unable/difficult refuel	Refueling valve (canister)

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Problem Symptoms Table

Use the Manual With the Right Hardware

When to See a Mechanic

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