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 MANUALSCHEVROLET1992RV CUTAWAY 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSTHROTTLE POSITION SENSOR (TPS)TPS ADJUSTMENT (DIESEL)6.2L HEAVY DUTY (VIN J)
1992 Chevrolet RV Cutaway 5.7 K
6.2L Heavy Duty (VIN J)
1992 Chevrolet RV Cutaway 5.7 KSECTION 6.2L Heavy Duty (VIN J)
- Remove air cleaner assembly and vacuum hoses. Disconnect TPS connector and install jumper wires between TPS and TPS harness connector. Turn ignition on, engine off.
- Using a DVOM, measure and record voltage between TPS connector terminals "A" and "C". This is the TPS reference voltage. Perform the following calculations:
- Reference voltage x 0.33 = Desired TPS voltage setting. Record the desired TPS voltage setting.
- Insert a .646" Gauge Block (J-33043-2) between gauge boss on pump and WOT stop screw on throttle lever. See Fig 1. Rotate throttle lever towards the WOT position, so gauge block is held firmly in place.
- Measure voltage between TPS terminals "B" and "C". This is the TPS voltage. Voltage must be within +/-1 percent of the desired TPS voltage setting from step 2). If TPS voltage is within tolerance, proceed to step 6). If TPS voltage setting is not within tolerance, go to next step.
- To adjust TPS, loosen TPS mounting screws and rotate TPS until desired TPS voltage is obtained. Tighten TPS mounting screws and recheck voltage reading. Replace TPS assembly, if adjustment is not possible.NOTE: Switch point must be set only while rotating TPS body in clockwise direction.
- Release throttle lever and allow lever to return to idle position. Open throttle lever back against gauge block and check if TPS voltage is within TPS reference voltage, see step 2). If reading is not within tolerance, replace TPS assembly.
- Turn ignition off. Remove gauge block, jumper from TPS and wiring harness, and reconnect TPS harness connector. Reinstall air cleaner assembly.
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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.