All PCM A-Chart

The TECH 1 scan data listed in this table may be used for comparison after completing the On-Board Diagnostic System Check and finding the on-board diagnostics functioning properly with no Diagnostic Trouble Codes (DTC) 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.

NOTE: 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 in this section for diagnosis. If a scan tool reads other parameters, they may apply to information in another section. For additional description on the values and use of the TECH 1 tool to diagnosis Powertrain Control Module (PCM) inputs, refer to Vehicle On-Board Diagnostics/Accessing and Reading Trouble Codes.
[1][2]C Code Charts
If all values are within the range illustrated and a problem exists, refer to Diagnosis By Symptom.
Testing and Inspection

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 +/- 100 RPM from desired

DESIRED IDLE RPM PCM idle command
(varies with temp)

ENGINE COOL
TEMP °C, °F 85° C - 100° C / 190° F - 212° F

INTAKE AIR TEMP °C, °F 10° C - 90° C (varies with underhood temp. and sensor location)

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

BARO kPa/Volts 10 - 128kPa / 0.00 - 5.10 volt

THROT POSITION Volts 0.45 - 0.65

THROTTLE ANGLE 0 - 100% 0%

02S 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

AIR FUEL RATIO air fuel ratio 14.76

SPARK ADVANCE Degrees 16° (varies continuously)

IDLE SPARK Enable/Disable Enable

KS ACTIVITY Yes/No No

KS RETARD Degrees 12°

LOOP STATUS Open/Closed "Closed Loop"

CONVERTER
HI TEMP No/Yes No

4WD LOW SWITCH Yes/No No (Not Used)

FUEL EVAP PURGE % 0% (1)

INT TUNING VALVE On/Off Off

EGR DESIRED POS % 0%

EGR ACTUAL POS % 0%

EGR PINTLE POS Volts 0.74 volts

EGR DUTY CYCLE % 0%

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

FUEL SHUTOFF Yes/No No

MPH/Km/h MPH/KPH 0/0

TCC Solenoid Off/On Off

TRANS RANGE SW Invalid, Rev 3 Park/Neutral

Drive 4/Drive 3

Drive 2/Low

Park/Neutral

A/B/C RANGE On/Off Off/On/Off

TCC BRAKE SWITCH Open/Closed Closed

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 12.0 - 14.5

FUEL PUMP VOLTS Volts 12.0 - 14.5

IDLE SPARK Enable/Disable Enable

CALIBRATION ID 0 - 9999 Internal ID only

TIME FROM START Minutes Varies

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