Scan Tool Operation

The DRB-III scan tool or a generic scan tool may be used to monitor a specified component operating range. Component operating range is then compared to a normal operating range to determine if component is operating properly.
When using the DRB-III scan tool, scan tool will perform all service data inspection procedures. A generic scan tool may perform only specified service data inspection procedures. See SCAN TOOL OPERATION table.
Use scan tool to monitor specified component operation under specified operating condition. See SCAN TOOL SERVICE DATA SPECIFICATIONS table.
Specified component operating range should be within specified normal operating range. See SCAN TOOL SERVICE DATA SPECIFICATIONS table. If component operating range is not within normal operating range, perform specified Diagnostic Trouble Code (DTC) test or specified trouble symptom inspection procedure (if available). See SCAN TOOL SERVICE DATA SPECIFICATIONS table.
The DTC TESTS are listed under SELF-DIAGNOSTIC TESTS, before TROUBLE SYMPTOMS. Trouble symptom inspection procedures are listed after the DIAGNOSTIC TROUBLE CODE (DTC) TESTS.

SCAN TOOL OPERATION

Component Inspection	Generic Scan Tool	DRB-III Scan Tool
A/C Clutch Relay	No	Yes
A/C Switch	No	Yes
Barometric Pressure Sensor	No	Yes
Calculation Load	Yes	Yes
Closed Throttle Position Switch	No	Yes
Cranking Signal Ign. Switch ST Signal)	No	Yes
Crankshaft Position Sensor	Yes	Yes
Engine Coolant Temp. Sensor	Yes	Yes
Front Oxygen Sensor	Yes	Yes
Fuel Control Condition	Yes	Yes
Fuel Tank Differential Pressure Sensor	Yes	Yes
Idle Air Control Motor	No	Yes
Ignition Coil & Ignition Power Transistor	No	Yes
Fuel Injectors	No	Yes
Intake Air Temp. Sensor	Yes	Yes
Long Term Fuel Compensation	Yes	Yes
Manifold Differential Pressure Sensor	Yes	Yes
Park/Neutral Position Switch (A/T)	No	Yes
Power Steering Pressure Switch	No	Yes
Power Supply Voltage	No	Yes
Rear Oxygen Sensor	Yes	Yes
Short Term Fuel Compensation	Yes	Yes
Throttle Position Sensor	Yes	Yes
Vehicle Speed Sensor	Yes	Yes
Volume Airflow Sensor	Yes	Yes

SCAN TOOL SERVICE DATA SPECIFICATIONS

Item No. & Component

Specified Operating Condition

Normal Operating Range

DTC Test Number

Trouble Symptom Inspection Procedure Number

11-Front Oxygen Sensor ⁽¹⁾

Engine At 4000 RPM & Suddenly Decelerated

200 Millivolts Or Less

.....

Engine Suddenly Accelerated

600-1000 Millivolts

.....

Engine Idling & Then Accelerated To 2500 RPM

⁽²⁾

.....

12-Volume Airflow Sensor ⁽³⁾

Engine Idling

22-48 Hz

.....

Engine At 2500 RPM

60-100 Hz

.....

Engine Suddenly Accelerated

⁽⁴⁾

.....

13-Intake Air Temp. Sensor ⁽⁵⁾

Intake Air Temperature -4°F (-20°C)

-20°C

.....

Intake Air Temperature 32°F (0°C)

0°C

.....

Intake Air Temperature 68°F (20°C)

20°C

.....

Intake Air Temperature 104°F (40°C)

40°C

.....

Intake Air Temperature 176°F (80°C)

80°C

.....

14-Throttle Position Sensor ⁽⁶⁾

Idle Position

300-1000 Millivolts

.....

Gradually Open

⁽⁷⁾

.....

Fully Open

4500-5500 Millivolts

.....

16-Power Supply Voltage

Ign. On

Battery Voltage

.....

18-Cranking Signal ⁽⁶⁾

Engine Off

Off

.....

30 (M/T) or 31 (A/T)

Engine Cranking

.....

30 (M/T) or 31 (A/T)

21-Engine Coolant Temp. Sensor ⁽⁵⁾

Coolant Temperature -4°F (-20°C)

-20°C

.....

Coolant Temperature 32°F (0°C)

0°C

.....

Coolant Temperature 68°F (20°C)

20°C

.....

Coolant Temperature 104°F (40°C)

40°C

.....

Coolant Temperature 176°F (80°C)

80°C

.....

22 Crankshaft Position Sensor ⁽⁸⁾

Engine Cranking With Tachometer Connected

⁽⁹⁾

.....

Coolant Temperature -4°F (-20°C)

1300-1500 RPM

.....

Coolant Temperature 32°F (0°C)

1200-1400 RPM

.....

Coolant Temperature 68°F (20°C)

1100-1300 RPM

.....

Coolant Temperature 104°F (40°C)

950-1150 RPM

.....

Coolant Temperature 176°F (80°C)

650-850 RPM

.....

24-Vehicle Speed Sensor

Drive Vehicle At 25 MPH (40 km/h)

25 MPH (40 KM/H) S

.....

25-Barometric Pressure

0 Feet

101 kPa

.....

1,969 Feet

95 kPa

.....

3,937 Feet

88 kPa

.....

5,906 Feet

81 kPa

.....

26-Closed Throttle Position Switch ⁽⁶⁾

Throttle Closed

.....

Throttle Slightly Open

Off ⁽¹⁰⁾

.....

27-Power Steering Pressure Switch

Engine Idling With Steering Wheel Stationary

Off

.....

Engine Idling With Steering Wheel Turning

Off

.....

28-A/C Switch

Engine Idling With A/C Switch OFF

Off

.....

Engine Idling With A/C Switch ON

.....

29-Park/ Neutral Position Switch (A/T)

In Park Or Neutral With Ignition On

"P" Or "N"

.....

In "D", "2", "L" Or "R" With Ignition On

"D", "2", "L" Or "R"

.....

41-Fuel Injectors

⁽¹¹⁾ Coolant Temperature 32°F (0°C)

37-45 Milliseconds

.....

⁽¹¹⁾ Coolant Temperature 68°F (20°C)

20-24 Milliseconds

.....

⁽¹¹⁾ Coolant Temperature 176°F (80°C)

5.3-6.5 Milliseconds

.....

⁽³⁾ Engine Idling

1.80-2.20 Milliseconds

.....

⁽³⁾ Engine At 2500 RPM

1.45-1.75 Milliseconds

.....

⁽³⁾ Engine Suddenly Accelerated

Increase In Display

.....

44-Ignition Coils & Ignition Power Transistor ⁽¹⁾

Check Ign. Timing With Engine Idling

0-13° BTDC

.....

Check Ign. Timing With Engine At 2500 RPM

20-40° BTDC

.....

45-Idle Air Control Motor ⁽¹²⁾

A/C Switch OFF

2-25 Steps

.....

A/C Switch ON

Increase Of 10-70 Steps

.....

A/C Switch OFF With Shift Lever Moved From Neutral To Drive On A/T

Increase Of 5-50 Steps

.....

49-A/C Clutch Relay ⁽¹⁾

A/C Switch OFF

OFF

.....

A/C Switch ON

.....

59-Rear Oxygen

⁽¹³⁾ Engine At 3500 RPM

600-1000 Millivolts

.....

73-Fuel Tank Differential Pressure Sensor

⁽¹⁴⁾ Engine At 3500 RPM

-3.3 kPa - 3.3 kPa

.....

81-Long Term Fuel Compensation

⁽¹⁾ Engine At 2500 RPM With No Load During Closed Loop

-12.5-12.5%

.....

82 Short Term Fuel Compensation

⁽¹⁾ Engine At 2500 RPM With No Load During Closed Loop

-17.0-17.0%

.....

87-Calculation Load Value

⁽¹⁾ Engine Idling

12.0-19.0%

.....

⁽¹⁾ Engine At 2500 RPM

12.0-19.0%

.....

88-Fuel Control Condition

⁽¹⁾ Engine At 2500 RPM

Closed Loop

.....

⁽¹⁾ Engine Suddenly Accelerated

Open Loop

.....

95-Manifold Differential Pressure Sensor

⁽¹⁾ Engine Idling

32.8- 46.2 kPa

.....

⁽¹⁾	Check with engine at normal operating temperature.

⁽²⁾	Voltage should be 400 millivolts or less at idle and then change to 600-1000 millivolts when engine is accelerated to 2500 RPM.

⁽³⁾	Check with engine at normal operating temperature, all accessories off and with transaxle in Park (A/T) or Neutral (M/T).

⁽⁴⁾	Frequency should increase in response to increase in engine RPM.

⁽⁵⁾	Check with ignition on or with engine running.

⁽⁶⁾	Check with ignition on.

⁽⁷⁾	Voltage should increase in proportion to throttle opening.

⁽⁸⁾	Check with engine cranking and then with engine idling with closed throttle position switch in ON position and at specified coolant temperature.

⁽⁹⁾	Engine speed on tachometer and scan tool should be the same.

⁽¹⁰⁾	If throttle position sensor voltage increases 100 millivolts from voltage at idle to the voltage when throttle is slightly opened and closed throttle position switch turn off, throttle position sensor requires adjustment.

⁽¹¹⁾	Check with engine cranking and at specified coolant temperature.

⁽¹²⁾	Check with engine at normal operating temperature, closed throttle position switch in ON position, all accessories off and with transaxle in Park (A/T) or Neutral (M/T).

⁽¹³⁾	Check with transaxle in Low gear (A/T) or 2nd gear M/T) and wide open throttle.

⁽¹⁴⁾	Check with ignition on and fuel tank cap removed.