Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Problem Symptoms Table
HINT:
Use the table below to help determine the cause of the problem symptom. 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.
| Symptom | Suspected Area | See |
|---|---|---|
| Engine does not crank (does not start) | 1. Cranking holding function circuit | CRANKING HOLDING FUNCTION CIRCUIT |
| 2. Starter | STARTER | |
| 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 | TERMINALS OF ECM | |
| No complete combustion (does not start) | 1. Fuel pump control circuit | ECM POWER SOURCE 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. A/T faulty | PROBLEM SYMPTOMS TABLE | |
| Hesitation/Poor acceleration (Poor driveability) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. A/T faulty | PROBLEM SYMPTOMS TABLE | |
| Engine stalls during A/C operation | 1. A/C signal circuit (compressor circuit) | COMPRESSOR CIRCUIT |
| 2. ECM | TERMINALS OF ECM | |
| Unable/Difficult to refuel | 1. ORVR system | - |
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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.
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