## Fuel and Emissions Systems

#### Symptom Troubleshooting Index

11-9

When the vehicle has one of these symptoms, check Diagnostic Trouble Code (DTC) with scan tool. If there is no DTC, to the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

Symptom | Diagnostic Procedure | Also check for
Malfunction Indicator Lamp (MIL) turns ON | Immobiliser System |
Excessive vibration |

1. Engine Mount
2. Fuel filter, Fuel Line, Fuel, Fuel Condition.
3. Injection Timing System.

   (CKP Sensor, CMP sensor, Mechanical timing)

4. Fuel Injection System.

   (Injector, Supply Pump, Common Rail)

- Contaminated Fuel
- Engine Mechanical
- Chassis Parts Error

Excessive smell |

1. Injection Timing System.

   (CKP Sensor, CMP Sensor, Mechanical timing)

2. Fuel filter, Fuel Line, Fuel, Fuel Condition.
3. Catalyst Converter.

- Low Compression
- Engine Mechanical

Engine will not start |

1. Starter System.
2. Immobiliser System.
3. Injection Timing System.

   (CKP Sensor, CMP Sensor, Mechanical timing)

4. Fuel filter, Fuel Line, Fuel, Fuel Condition.
5. Fuel Injection System.

   (Injector, Supply Pump, Common Rail)

6. ECM (ECM, Fail Safe Mode)

- Low Compression
- Contaminated Fuel
- Engine Mechanical

Difficult to start when cold |

1. Starter System.
2. Immobiliser System.
3. Injection Timing System.

   (CKP Sensor, CMP Sensor, Mechanical timing)

4. Fuel filter, Fuel Line, Fuel, Fuel Condition.
5. Glow System.

   (Glow Relay, Glow Plug)

6. Fuel Injection System.

   (Injector, Supply Pump, Common Rail)

7. ECM (ECT Sensor, ECM, Fail Safe Mode)

- Low Compression
- Contaminated Fuel

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