Scan Data

WARNING: This page is about a different car, the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Buick LeSabre, and 1990 Buick Electra. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Information contained in the following tables is typical of readings taken on vehicle with engine idling, upper radiator hose hot, closed throttle, transmission in Park or Neutral, closed loop status achieved and all accessories off (except as noted in tables). Data parameters are updated every 1 1/4 seconds. On systems using P-4 computers, parameter updates are more often. Not all devices & systems are used on all models.

PORT FUEL INJECTION

Tester Position

Units Measured

Nominal Value

Engine Speed

RPM

650-850

Coolant Temp.

°C

85-105° (norm. temperature)

Mani Air Temp.

°C

Varies with Air Temperature

Throttle Position

Volts

.33-.46

LV8

70-80

O2 Sensor

Millivolts

100 (lean) to 900 (rich)

Injector Pulse Width

Milliseconds

4.0-5.0 (Varies)

Spark Advance

Degrees

20°

Mass Air Flow

GM/SEC

4-7

Fuel Integ.

Counts

⁽¹⁾ 110-138

Block Learn

Counts

⁽¹⁾ 110-138

Knock Signal

No/Yes

Idle Air Control

Counts (steps)

10-30

P/N Switch

P/N/RDL

Park/Neutral

Vehicle Speed

MPH, KPH

0 (Zero)

TCC

On/Off

Off (On with command)

Battery Voltage

Volts

13.8 Volts (Varies)

Exhaust Recirc.

0 (Zero)

A/C Request

On/Off

OFF

Brake Switch

No/Yes

No (Yes with brake pedal depressed)

Power Steering

High Press/Normal

Normal

QDM1

High/Low

Low

QDM2

High/Low

Low (High if A/C head pressure's high)

QDM3

High/Low

Low (High w/brake pedal depressed

QDM4

High/Low

Low

P/N

Yes/No

Yes

2nd Gear

Yes/No

3rd Gear

Yes/No

4th Gear

Yes/No

PROM ID

Numbers

Internal ID Only

⁽¹⁾	A poor ECM ground at the ignition module mounting bracket to engine could cause fuel integ and block learn to read around 150; make careful physical inspection of this critical connection.