Engine

The TECH 1 scan data listed in these tables may be used for comparison after completing the "On-Board Diagnostic (OBD) System Check" and finding the on-board diagnostics functioning properly with no Diagnostic Trouble Codes [DTC(s)] displayed. The "Typical TECH 1 Data Values" are an average of display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would display. The values you get may vary due to low battery charge or other reasons, but they should be very close.

A SCAN TOOL THAT DISPLAYS FAULTY DATA SHOULD NOT BE USED, AND THE PROBLEM SHOULD BE REPORTED TO THE MANUFACTURER. THE USE OF A FAULTY SCAN TOOL CAN RESULT IN MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT.

Only the parameters listed below are used for diagnosis. If a scan tool reads other parameters, the values are not recommended by OEM for use in diagnosis. For more description on the values and use of the TECH 1 tool to diagnosis Powertrain Control Module (PCM) inputs, refer to the applicable components. If all values are within the range illustrated, refer to DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
- Intermittent Malfunctions

TECH 1 TOOL DATA
Test Under Following Conditions:
^ Engine at Operating Temperature
^ Engine Idling in "Closed Loop"
^ Closed Throttle
^ Park/Neutral
^ All Accessories "OFF"

SCAN Position Units Displayed Typical Data Value

ENGINE SPEED RPM +/- 50 RPM from desired RPM in drive (A/T) +/- 100 RPM from desired

DESIRED IDLE RPM PCM idle command
(varies with temp)

ENGINE COOL
TEMP °C, ° F 85° C - 105° C/190° F - 210° F

LOOP STATUS Open/Closed "Closed Loop"

MAP kPa/Volts 29 - 48 kPa/1 - 2 volts (varies with manifold and barometric pressures)

BARO kPa/Volts 60 - 105kPa

THROT POSITION Volts 0.35 - 1.28

THROTTLE ANGLE 0 - 100% 0%

O2S Millivolts 100 - 999 (varies continuously)

INJ PULSE WIDTH Milliseconds 0.8 - 3.0

SHORT TERM FUEL
TRIM Counts 110 - 145

LONG TERM FUEL
TRIM Counts 118 - 138

FUEL TRIM CELL Cell# 0

FUEL TRIM ENABLE No/Yes No

SPARK ADVANCE Degrees 0° TO 20°, varies continuously

IDLE SPARK Enable/Disable Enable

KS ACTIVITY Yes/No No

KS RETARD Degrees 0°

IDLE SPEED CONTROL
ACTUATOR OFF/ON ON

CONVERTER
HI TEMP No/Yes No

FUEL EVAP
PURGE 0 - 100% 0% (1)

EGR DESIRED POS 0 - 100% 0%

EGR ACTUAL POS 0 - 100% 0%

EGR PINTLE POS Volts 0.74 volts

EGR DUTY CYCLE 0 - 100% 0%

ENGINE OVERSPEED No/Yes No

VEHICLE OVERSPEED No/Yes No

MPH/Km/h MPH/KPH 0/0

1-2 SOL/2-3 SOL Off/On Off/On Off

FUEL SHUTOFF Yes/No No

TCC SOLENOID Off/On Off

TRANS RANGE SW Drive 4/Drive 3 P - N

Drive 2/Low P - N

Reverse/P - N P - N

A/B/C RANGE On/Off Off

TCC BRAKE SWITCH On/Off On

FUEL SHUTOFF Yes/No No

IDLE AIR CONTROL Counts (Steps) 1 - 50

PARK/NEUTRAL POS PN/RDL Park/Neutral

A/C REQUEST No/Yes No

A/C CLUTCH On/Off Off

SYSTEM VOLTAGE Volts 13.5 - 14.5

FUEL PUMP VOLTS Volts 13.5 - 15.5

CALIBRATION ID 0 - 9999 Internal ID only

TIME FROM START Minutes Varies

(1) If not equipped with purge solenoid scan tool will display 0% or 99%.