Home Auto Repair 1999-2004 Isuzu NPR/ NQR Commercial Medium Duty Harsh Shifting Delayed Upshifts with...

1999-2004 Isuzu NPR/ NQR Commercial Medium Duty Harsh Shifting Delayed Upshifts with Possible CHECK TRANS Lamp Illuminated

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Download Some customers may comment on harsh shifting and/or delayed upshifts that may or may not be accompanied by a CHECK TRANS lamp illumination. Correction Perform the TPS relearn procedure below. Important: The TCM relearn procedure MUST be done after replacement or adjustment of the following components: • The injection pump • The engine assembly • The accelerator pedal • The accelerator cable • The throttle position sensor (TPS) • The kick-down switch • The TCM • The transmission Failure to do this may result in a hard shift, delayed shift, slippage or excessive automatic transmission clutch material wear conditions. The TPS relearn procedure should also be done when the following conditions occur: • Harsh shifting • Delayed upshifts • Take-off in fail-safe mode (2nd gear) • Flashing Check Trans light (no stored codes) TPS Relearn Procedure If there is a change in the relationship between the TPS and the injection pump rack voltage, there will be a noticeable change in the shift pattern of the transmission.