Fuel System - Gasoline

1. General Description

Fuel Storage

Fuel Pump and Fuel Circuit

Air Filter

1.1 Continuous Injection System (CIS)

1.2 Continuous Injection System-Electronic (CIS-E)

1.3 CIS-E Motronic Engine Management System

1.4 Digifant II Engine Management System

1.5 Digifant I Engine Management System

1.6 Applications-Identifying Features

Four-cylinder (8-valve) Engines

16-valve Engines

Identifying The Systems

3. Troubleshooting

3.1 Basic Troubleshooting Principles

3.2 CIS Troubleshooting

3.3 CIS-E and CIS-E Motronic Troubleshooting

3.4 CIS-E Motronic Fault Diagnosis

3.5 Digifant II and Digifant I Troubleshooting

4. Fuel Supply

4.1 Fuses and Relays

Operating Fuel Pump For Test

4.2 Transfer Pump

4.3 Fuel pump

Fuel Pump Electrical Tests

Replacing Fuel Pump

Replacing Fuel Pump Check Valve (CIS, CIS-E, and CIS-E Motronic)

4.4 Fuel Pressure Regulator

CIS Pressure Relief Valve

CIS-E and CIS-E Motronic Diaphragm Pressure Regulator

Digifant Fuel Pressure Regulator

4.5 Evaporative Emission Controls

Testing Charcoal Canister Bypass Valve (CIS, CIS-E, Digifant)

Testing Charcoal Canister Solenoid Valves (CIS-E Motronic)

4.6 Accelerator Cable

4.7 Fuel Injectors (CIS, CIS-E and CIS-E Motronic)

Removing and Installing Fuel Injectors

Quick-checking Injectors

Testing Injector Fuel Delivery

Cleaning and Testing Injectors

4.8 Fuel Injectors (Digifant II)

Testing Injectors

Removing and Installing Injectors

5. Continuous Injection System (CIS)

5.1 Air Flow Measurement and Fuel Metering

Throttle Valve Basic Adjustment

Air Flow Sensor

Fuel Distributor

5.2 Cold Start Enrichment

5.3 Cold Running Enrichment

Testing and Replacing Control Pressure Regulator

5.4 Idle Speed

Idle Air Bypass Adjustment

Auxiliary Air Regulator

Idle Speed Boost Valve

5.5 Fuel Pressure Tests and Specifications

System Pressure

Control Pressure

Residual Pressure

5.6 Idle Specifications (rpm and % CO)

6. CIS-Electronic (CIS-E) and CIS-E Motronic

6.1 Air Flow Measurement and Fuel Metering

Throttle Valve Basic Adjustment

Throttle Switches (HT, RD, PL and 9A engines)

Air Flow Sensor

Basic Adjustments

Fuel Distributor

Differential Pressure Regulator

6.2 Cold Start Enrichment

6.3 Idle Speed

Adjusting Idle Air Bypass (engine code GX only)

Idle Air Stabilizer Valve (engine codes HT, RD, PL and 9A)

Adjusting Idle Air Stabilizer Duty Cycle (engine codes HT, RD and PL)

6.4 Electrical Tests (CIS-E)

After-start and Cold Running Enrichment

Cold Acceleration Enrichment

Full-throttle Enrichment (engine codes HT, RD, and PL only)

Deceleration Fuel Shutoff (engine codes HT, RD, and PL only)

Control Unit Inputs

6.5 Electrical Tests (CIS-E Motronic)

After-start, Warm-up and Cold Acceleration Enrichment

Coolant Temperature Sensor

Deceleration Fuel Shutoff

Air Flow Sensor Potentiometer

Control Unit Inputs

6.6 Fuel Pressure Tests and Specifications

System Pressure

Differential Pressure

Residual Pressure

6.7 Idle Specifications

CIS-E

CIS-E Motronic

7. Digifant II Fuel Injection

7.1 Air Flow Measurement

Air Flow Sensor

Throttle Valve Basic Adjustment

Throttle Valve Vacuum Hoses

7.2 Cold Start and Cold Running Enrichment

Coolant Temperature Sensor

Intake Air Preheat System

7.3 Idle Speed

Idle Air Bypass

Idle Air Stabilizer Valve

Idle and Full-Throttle Switches

7.4 Electrical Tests

7.5 Fuel Pressure Tests and Specifications

System Pressure and Residual Pressure

Replacing Pressure Regulator

7.6 Idle Mixture Specifications (% CO)

7.7 Digifant II On-Board Fault Diagnosis (California only)

8. Digifant I Fuel Injection (California)

8.1 Digifant I On-Board Fault Diagnosis

8.2 Resetting Digifant I Control Unit

8.3 Air Flow Measurement

8.4 Cold Start and Cold Running Enrichment

8.5 Idle Speed and Mixture (% CO) Adjustment

Idle Speed and Mixture Adjustment

Throttle Valve Potentiometer

8.6 Electrical Tests

Testing Fuel Injectors

Control Unit Inputs

8.7 Fuel Pressure Tests and Specifications

9. Fuel System Technical Data

I. CIS Fuel Injection Specifications

II. CIS-E Fuel Injection Specifications

III. CIS-E Motronic Fuel Injection Specifications

IV. Digifant II and Digifant I Fuel Injection Specifications