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HOMESERVICE MANUALSCHEVROLET1996SPORTVAN VAN PASSENGER EXTENDED, 6.5 YREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 44 (ENGINE CONTROLS - TESTS W/CODES - 6.5L DIESEL)DIAGNOSTIC TROUBLE CODE CHARTSDTC 49, SERVICE THROTTLE SOON LIGHT CIRCUIT FAULTNOTES
1996 Chevrolet Sportvan Van Passenger Extended, 6.5 Y

DTC 49, Service Throttle Soon Light Circuit Fault: Notes

1996 Chevrolet Sportvan Van Passenger Extended, 6.5 YSECTION Notes
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1995 GMC Yukon, 1995 GMC Suburban, 1995 GMC Pickup, 1995 GMC Cab & Chassis, and 1995 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

SERVICE THROTTLE SOON light should always light when ignition is on and engine is not running for 2 seconds. PCM controls SERVICE THROTTLE SOON light by providing a ground path. DTC 49 will set when:

  • Ignition voltage on SERVICE THROTTLE SOON light control circuit when PCM is requesting SERVICE THROTTLE SOON light on.

Or 

  • No ignition voltage on SERVICE THROTTLE SOON light control circuit when PCM is requesting SERVICE THROTTLE SOON light off.

PCM will default to MIL will not light, but a current and history DTC 49 will set.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This step checks PCM's ability to command SERVICE THROTTLE SOON light.
  2. This step determines if an open is present in ignition feed circuit or SERVICE THROTTLE SOON light control circuit.
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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