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The following diagnosis might be helpful if the vehicle exhibits the described symptoms in the PI.
This applies to vehicles equipped with 4L60E or 4L65E transmissions. The engine does not stall when performing a "P1870 Diagnostic Test" with the Tech 2 scan tool or when commanding the torque converter clutch enable solenoid on applications that do not have the "P1870 Diagnostic Test" listed.
When diagnosing a DTC P1870 or P0894 Transmission Component Slipping on any vehicle equipped with a 4L60E or 4L65E, be cautious when using the "P1870 Diagnostic Test". There are a wide variety of models over several years that use these transmissions and it seems that the scan tool reacts differently from one application to another. Best practice would be to verify any torque converter clutch slip concern with an actual road test rather then relying on the service bay stall test. This also applies to later models that do not have the "P1870 Diagnostic Test" on the scan tool but rely on commanding the torque converter clutch enable solenoid on in gear and checking for a stall. Technical service bulletin 99-07-30-023 has additional information on diagnostics related to this concern.
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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.
(96-05 All GM light duty trucks and cars equipped with the 4L60E M30 and 4L65E M32)
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GM bulletins are intended for use by professional technicians,
NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to
provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment,
tools, safety instructions, and know-how to do a job properly and
safely. If a condition is described, DO NOT assume that the
bulletin applies to your vehicle, or that your vehicle will have
that condition. See your GM dealer for information on whether
your vehicle may benefit from the information. |
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