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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - TESTS W/CODES - 6.5L)SELF-DIAGNOSTIC SYSTEMTYPICAL TECH 1 OR 2 DATA VALUES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Typical Tech 1 Or 2 Data Values
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Typical Tech 1 Or 2 Data Values
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1997 GMC Yukon, 1997 GMC Suburban, 1997 GMC Pickup, 1997 GMC Cab & Chassis, and 1997 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. Refer to scan tool manufacturer's instructions.
TYPICAL TECH 1 OR 2 DATA VALUES
| Tool Position | Units Measured | Nominal Data Value |
|---|---|---|
| A/B/C Range Sw | On/Off | Off |
| A/C Compressor | Engage/ Disengage | Disengage |
| A/C Relay | Yes/No | No |
| A/C Request | On/Off | Off |
| Actual EGR | kPa | 75-85 |
| Act. Inj. Timing | Degrees | 4-7 |
| APP Angle | % | 0 |
| APP 1 | Volts | .45-.95 |
| APP 2 | Volts | 4.0-4.5 |
| APP 3 | Volts | 3.6-4.0 |
| BARO | kPa/Volt | 3-5 Volts (Varies With Altitude & BARO Pressure) |
| Boost Pressure | kPa | 60-103 (Varies With Altitude) |
| Boost Solenoid | % | 60-70 |
| Brake Switch | Opn/Clsd | Open |
| Calc A/C Load | Ft Lbs | 0 |
| Crank Ref Missed | # | 0 (Missed) |
| Cruise Active | On/Off | Off |
| Cruise Brake Sw. | Opn/Clsd | Clsd |
| Cruise Switch | On/Off | Off |
| Desired EGR | kPa | 75-85 |
| Desired Idle | RPM | PCM Commanded |
| Desired Speed | RPM | 652 |
| Des. Inj. Timing | Degrees | 4-7 |
| Device Control | Yes/No | No |
| DTC Set This Ign. | Yes/No | No |
| DTC Set This Ign. | Counts | 0 |
| ECT | F/C | 185-221 (85-105) (Varies With Temp) |
| ECT | F/C | 200 (93) |
| ECT Sensor | Volts | 1.7-2.2 (Varies With Temp.) |
| ECT Sensor | Volts | 2.0 |
| EGR Solenoid | % | 35-45 |
| EGR Vent Sol | On/Off | On |
| Engine Load | % | 4-6 |
| Engine Run Time | Seconds | 0 |
| Engine Run Time | Hr/Min /Sec | Varies |
| Engine Speed | RPM | +/-100 From Desired |
| Engine Speed | RPM | 650 |
| Engine Torque | Ft Lbs | 7-10 |
| ESO Solenoid | On/Off | On |
| Front Axle Sw. | Unlocked /Locked | Unlocked |
| Fuel Rate | Mm Cubed | 7-12 |
| Fuel Temperature | F/C | 159 (70) |
| Glow Plug | Volts | 0 |
| Glow Plug System | Disabled /Enabled | Disabled |
| IAT | F/C | 140-176 (60-80) (Varies With Temp.) |
| IAT Sensor | Volts | 1.46 |
| IAT Sensor | F/C | 109 (43) |
| Ignition Volts | Volts | 12-14 |
| Inj. Pump Cam Ref. Missed | Counts | 0 |
| Inj. Pump Sol. Closure Time | Milsec | 1.70-1.90 |
| Lift Pump | Volts | 12-15 |
| Lift Pump Relay | Disabled /Enabled | Enabled |
| Lift Pump | Volts | 12-15 |
| Lift Pump System | Disabled /Enabled | Enabled |
| MIL Light | On/Off | Off |
| MPH/KPH | MPH/KPH | 0-0 |
| PC Solenoid | On/Off | Off |
| Resume Switch | On/Off | Off |
| Set Switch | On/Off | Off |
| Start-Up ECT | F/C | Varies (Depends On Start-Up ECT) |
| Start-Up ECT | F/C | Varies |
| STS Light | On/Off | Off |
| TCC Enabled | On/Off | Off |
| TDC Offset | Degrees | +.75 To -1.95 |
| TFT | F/C | 158 (70) |
| TFT Sensor | Volts | 2.5-3.5 |
| TR Switch | Park/Neut, Rev, D1, D2, D3 | Park |
| 1-2 Sol/2-3 Sol | On/Off | On/Off |
| 4WDL Mode | Enabled/ Disabled | Disabled |
| # Of Curr DTCs | Counts | 0 |
RENDER: 1.0x
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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.