Home/Saab/9-2X/Saab 9-2X I (2004-2006)/Repair manual/Testing & Diagnostics/Check Input Signal for ECM (Using Vehicle Diagnostic Interf…

Contents

Wiring diagrams Section: Testing & Diagnostics

Check List No. 1

Check List No. 2

Battery

Engine Grounding

Precautions

On-Board Diagnostics (OBD) System

Engine & Emission Control System

Special Tools

Electrical Specification

How to Use Obd-Ii General Scan Tool

Mode $01 (Current Powertrain Diagnostic Data)

Mode $02 (Powertrain Freeze Frame Data)

Mode $03 (Emission-Related Powertrain DTC)

Mode $04 (Clear/reset Emission-Related Diagnostic Information)

Mode $06

Mode $07

Mode $09

How to Use Vehicle Diagnostic Interface

Read Diagnostic Trouble Code (DTC) for Engine (Normal Mode)

Read Diagnostic Trouble Code (DTC) for Engine (OBD Mode)

Read Current Data for Engine (Normal Mode)

Read Current Data for Engine (OBD Mode)

Read Freeze Frame Data for Engine (OBD Mode)

LED Operation Mode for Engine

VIN Registration

Vehicle Diagnostic Interface (Normal Mode)

Vehicle Diagnostic Interface (OBD Mode)

Obd-Ii General Scan Tool

Procedure

Preparation for the Inspection Mode

Vehicle Diagnostic Interface

Preparation for Drive Cycle

After Running 20 Minutes at 80 Km/h (50 Mph), Idle Engine for 1 Minute

Ten Minutes Idling

Operation

Activation of Malfunction Indicator Light

Starter Motor Circuit

Check Battery

Check Input Signal for Starter Motor

Check Ground Circuit of Starter Motor

Check Harness Between Battery & Ignition Switch Connector

Check Ignition Switch

Check Transmission Type

Check Input Voltage of Starter Interlock Relay

Check Starter Interlock Relay

Check Input Voltage of Inhibitor Switch

Check Inhibitor Switch

Check Ground Circuit of Clutch Switch

Check Clutch Switch

Check Clutch Switch Circuit

Check Power Supply & Ground Line of Engine Control Module (ECM)

Check Main Relay

Check Ground Circuit of ECM

Check Input Voltage of ECM

Check Input Voltage of Main Relay

Ignition Control System

Check Ignition System for Sparks

Check Power Supply Circuit for Ignition Coil & Ignitor Assembly

Check Harness of Ignition Coil & Ignitor Assembly Ground Circuit

Check Ignition Coil & Ignitor Assembly

Check Input Signal for Ignition Coil & Ignitor Assembly

Check Harness Between ECM & Ignition Coil & Ignitor Assembly Connector

Check Poor Contact

Fuel Pump Circuit

Check Operating Sound of Fuel Pump

Check Ground Circuit of Fuel Pump

Check Power Supply to Fuel Pump

Check Harness Between Fuel Pump & Fuel Pump Relay Connector

Check Fuel Pump Relay

Check Harness Between ECM & Fuel Pump Relay Connector

Fuel Injector Circuit

Check Operation of Each Fuel Injector

Check Power Supply to Each Fuel Injector

Check Harness Between ECM & Fuel Injector Connector

Check Each Fuel Injector

DTC List

DTC Detecting Condition

Check Harness Between ECM & Front Oxygen (A/f) Sensor Connector

Check Harness Between A/f & Oxygen Sensor Relay & Front Oxygen (A/f) Sensor Connector

Check Front Oxygen (A/f) Sensor

Check Any Other DTC on Display

Check Power Supply to Front Oxygen (A/f) Sensor

Check Current Data

Check Input Signal from ECM

Check Output Signal from ECM

Check Front Oxygen (A/f) Sensor Heater Current

Check Power Supply to Rear Oxygen Sensor

Check Rear Oxygen Sensor

Check Input Signal for ECM

Check Pressure Sensor

Check Throttle Position

Trouble Symptom

Connect Vehicle Diagnostic Interface or the Obd-Ii General Scan Tool & Read Data

Check Input Signal for ECM (Using Vehicle Diagnostic Interface)

Check Power Supply to Mass Air Flow Sensor

Check Harness Between ECM & Mass Air Flow Sensor Connector

Check Output Signal for ECM

Check Harness Between Manifold Absolute Pressure Sensor & ECM Connector

Check Harness Between Intake Air Temperature Sensor & ECM Connector

Check Harness Between Engine Coolant Temperature Sensor & ECM Connector

Check Harness Between ECM & Electronic Throttle Control

Check Power Supply of Electronic Throttle Control

Check Short Circuit Inside the ECM

Check Sensor Output

Check Sensor Output Power Supply

Check Thermostat

Check Engine Coolant Temperature Sensor

Check Vehicle Condition

Check Engine Coolant

Check Radiator Fan

Check Exhaust System

Check Rear Oxygen Sensor Data

Check Harness Between ECM & Rear Oxygen Sensor Connector

Check Harness Between Rear Oxygen Sensor & ECM Connector

DTC P0171: System Too Lean (Bank 1)

Check Air Intake System

Check Purge Control Solenoid Valve or Pressure Control Solenoid Valve

Check Fuel Pressure

Check Pressure Sensor Signal

Check Harness Between Fuel Temperature Sensor & ECM Connector

Check Output Voltage of Sensor

Check Poor Contact in Connectors

Check Power Supply to Sensor

Check Short of ECM

DTC P0301: Cylinder 1 Misfire Detected

DTC P0302: Cylinder 2 Misfire Detected

DTC P0303 Cylinder 3 Misfire Detected

Check Harness Between Fuel Injector & ECM Connector.

Check Harness Between Fuel Injector & ECM Connector

Check Fuel Injector

Check Power Supply Line

Check Installation of Camshaft Position Sensor/crankshaft Position Sensor

Check Crank Sprocket

Check Installation Condition of Timing Belt

Check Fuel Level

Check Status of Malfunction Indicator Light

Check Cause of Misfire Diagnosed

Check for Poor Contact

Check Misfire Symptom

Check DTC on Display

Only One Cylinder

Group of #1 & #2 Cylinders

Group of #3 & #4 Cylinders

Group of #1 & #3 Cylinders

Group of #2 & #4 Cylinders

Cylinder at Random

Check Harness Between Knock Sensor & ECM Connector

Check Knock Sensor

Check Condition of Knock Sensor Installation

Check Harness Between Crankshaft Position Sensor & ECM Connector

Check Condition of Crankshaft Position Sensor

Check Crankshaft Position Sensor

Check Camshaft Position Sensor

Check Harness Between Camshaft Position Sensor & ECM Connector

Check Condition of Camshaft Position Sensor

Check Cam Sprocket

Check Power Supply to EGR Solenoid Valve

Check EGR Solenoid Valve

Output Signal from ECM

Check Harness Between EGR Solenoid Valve & ECM Connector

Check Catalytic Converter

Check Fuel Filler Cap

Check Fuel Filler Pipe Packing

Check Drain Valve

Check Purge Control Solenoid Valve

Check Pressure Control Solenoid Valve

Check Evaporative Emission Control System Line

Check Canister

Check Fuel Tank

Check Any Other Mechanical Trouble in Evaporative Emission Control System

Check Harness Between Drain Valve & ECM Connector

Check Power Supply to Drain Valve

Check Power Supply to Fuel Tank Pressure Sensor

Check Harness Between ECM & Coupling Connector in Rear Wiring Harness

Check Fuel Tank Cord

Check Input Signal for ECM.

Check Input Signal for ECM (Using Vehicle Diagnostic Interface.)

Check Harness Between ECM & Fuel Tank Pressure Sensor Connector

Check Harness Between Purge Control Solenoid Valve & ECM Connector

Check Speedometer & Tachometer Operation in Combination Meter

Check Harness Between ECM & Combination Meter

Check Fuel Level Sensor

Check Fuel Sub Level Sensor

DTC P0502: Vehicle Speed Sensor Circuit Low Input

Check DTC P0720 on Display

Check Speedometer Operation in Combination Meter

Check Harness Between ECM & Combination Meter Connector

DTC P0605: Internal Control Module Read Only Memory (Rom) Error

DTC P0638: Throttle Actuator Control Range/performance (Bank 1)

DTC P0700: Transmission Control System (MIL Request)

Check Neutral Position Switch

Check Harness Between ECM & Neutral Position Switch Connector

Check Harness Between ECM & Inhibitor Switch Connector

Check Inhibitor Switch Ground Line

Check Selector Cable Connection

Check Neutral Switch

Check Harness Between ECM & Neutral Switch Connector

DTC P1160: Return Spring Failure

Check Harness Between Fuel Tank Pressure Control Solenoid Valve & ECM Connector

Check Fuel Tank Pressure Control Solenoid Valve

Check Power Supply to Fuel Tank Pressure Control Solenoid Valve

Check Harness Between Fuel Tank Sensor Control Valve & ECM Connector

Check Fuel Tank Sensor Control Valve

Check Power Supply to Fuel Tank Sensor Control Valve

DTC P1492: EGR Solenoid Valve Signal #1 Circuit Malfunction (Low Input)

DTC P1493: EGR Solenoid Valve Signal #1 Circuit Malfunction (High Input)

DTC P1494: EGR Solenoid Valve Signal #2 Circuit Malfunction (Low Input)

DTC P1495: EGR Solenoid Valve Signal #2 Circuit Malfunction (High Input)

DTC P1496: EGR Solenoid Valve Signal #3 Circuit Malfunction (Low Input)

DTC P1497: EGR Solenoid Valve Signal #3 Circuit Malfunction (High Input)

Check Electronic Throttle Control Relay

Check Power Supply to Electronic Throttle Control Relay

Check Harness Between ECM & Electronic Throttle Control Relay

Check the Harness Between ECM & Electronic Throttle Control

Check Harness Between ECM & Electronic Throttle Control Motor

Check Electronic Throttle Control Motor Harness

Check Electronic Throttle Control Ground Circuit

Check Electronic Throttle Control

DTC P2109: Throttle/pedal Position Sensor a Minimum Stop Performance

Check Output Voltage of Accelerator Position Sensor

Check Harness Between ECM & Accelerator Position Sensor

Check Accelerator Position Sensor Power Supply

Check Accelerator Position Sensor

Check Power Supply to Accelerator Position Sensor

Check Electronic Throttle Control Harness

All sections

Check Input Signal for ECM (Using Vehicle Diagnostic Interface) Saab 9-2X I

Testing & Diagnostics

Read the data of fuel tank pressure sensor signal using Vehicle Diagnostic Interface.

Note. Vehicle Diagnostic Interface For detailed operation procedures, refer to " READ CURRENT DATA FOR ENGINE ".

Does the measured value change by shaking the ECM harness and connector?

YES

Repair poor contact in ECM connector.

NO. Go to next step.