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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - TESTS W/CODES - 6.5L DIESEL)SELF-DIAGNOSTIC SYSTEMTYPICAL TECH-1 DATA VALUES
1987 Chevrolet Hi-Cube 6.2 J, 400/M40
Typical Tech-1 Data Values
1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Typical Tech-1 Data Values
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Information contained in the following table is typical of readings taken on vehicle with engine idling, upper radiator hose hot, throttle closed, transmission in Park or Neutral, closed loop status achieved and all accessories off (except as noted in tables). Not all devices and systems are used on all models. For additional information, see tester owner's manual.
TYPICAL TECH-1 DATA VALUES
| Tester Position | Units Measured | Nominal Value |
|---|---|---|
| A/C Clutch | On/Off | Off |
| Accel Ped Pos No. 1 | Volts | .35-.95 |
| Accel Ped Pos No. 2 | Volts | 4.0-4.5 |
| Accel Ped Pos No. 3 | Volts | 3.6-4.0 |
| BARO | kPa/Volt | 70-100/3.5-4.5 (Varies With Altitude) |
| Calibration ID | 0-9999 | Internal |
| Cam Ref Missed | Counts | 0 |
| C/C Brake Switch | Opn/Clsd | Open |
| Crank Ref Missed | Counts | 0 |
| Cruise Control | On/Off | Off |
| Desired Idle | RPM | PCM Commanded (Based On Temp) |
| Desired Injector Timing | Number Of Degrees | Varies |
| EGR Duty Cycle | Percent | 50-100 (May Vary) |
| EGR Pressure | kPa/Volt | 50-100/2.8-3.0 (Varies) |
| Engine Cool Temp | °F/°C | 185-221 (85-105) |
| Engine Shut Off | On/Off | On |
| Engine Speed | RPM | +/-100 From Desired |
| Fuel Rate | Mm | 0-40 (Varies W/Engine Load) |
| Fuel Temperature | °F/°C | 70-110 (21-43) |
| Glow Plug Relay | Volts | 12.0-14.5 |
| Glow Plug Volts | Volts | 12.0-14.5 |
| Inj Pulse Width | Mil./Sec | 1.7-1.9 (May Vary) |
| Intake Air Temp | °F/°C | 50-194 (10-87) (Depends On Underhood Temp) |
| Measured Injector Timing | Number Of Degrees | Varies |
| System Voltage | Volts | 12.0-14.5 |
| TCC Brake Switch | Closed/Open | Closed |
| TCC Solenoid | On/Off | Off |
| TDC Offset | # Of ° | 0-2.02 (Varies) |
| Throttle Angle | Percent | 0 |
| Time From Start | Hrs/Min/Sec | Varies |
| Trans Range Sw. | Invalid, Rev, D4, D3, D2, Lo, P/N | Park/Neut |
| 1-2 Sol/2-3 Sol | On/Off | On/On |
| 4WD Low Switch | On/Off | Off |
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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.