Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1994K 2500 SUBURBAN 4WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONSENGINE
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7L
Engine
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7LSECTION 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 PCM inputs, refer to the applicable components. If all values are within the range illustrated, refer to DIAGNOSIS BY SYMPTOM/ INTERMITTENTS - Intermittent Malfunctions .
1 of 2
2 of 2
TECH 1 TOOL DATA
Test Under Following Conditions:
^ Engine at Operating Temperature
^ Engine Idling in "Closed Loop"
^ Closed Throttle
^ Park/Neutral
^ All Accessories "OFF"
(1) If not equipped with purge solenoid scan tool will display 0% or 99%.
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 PCM inputs, refer to the applicable components. If all values are within the range illustrated, refer to DIAGNOSIS BY SYMPTOM/ INTERMITTENTS - Intermittent Malfunctions .
Typical Scan Data Values (1 of 2) - PCM:
1 of 2
Typical Scan Data Values (2 of 2) - PCM:
2 of 2
TECH 1 TOOL DATA
Test Under Following Conditions:
^ Engine at Operating Temperature
^ Engine Idling in "Closed Loop"
^ Closed Throttle
^ Park/Neutral
^ All Accessories "OFF"
(1) If not equipped with purge solenoid scan tool will display 0% or 99%.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.