Inspect the TAC module connectors for signs of water intrusion.
2003 CHEVY SUBURBAN CODE P1518 SERIAL
An intermittent may be caused by the following conditions: - Poor connections - Corrosion - Misrouted harness - Rubbed through wire insulation - Broken wire inside the insulation - Water intrusion Inspect for intermittent connections at the TAC module power and ground circuits and the TAC Module/PCM serial data circuits. Using a scan tool Diagnostic Aids Inspect for the cause of intermittents. Important: The clear DTC info function may have to be performed twice in order to clear a throttle actuator Control System DTC. A last test failed (current DTC) will clear when the diagnostic runs and does not fail. 40 consecutive warm-up cycles has occurred A History DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. If certain TAC System DTCs are set at the same time, the TAC System will either default to a more tightly restricted mode of operation if it is determined that limited safe operation is possible, or command engine shut down.Ģ of 6 Conditions for Clearing the MIL/DTC The PCM will turn the MIL OFF after 3 consecutive drive trips that the diagnostic runs and does not fail. If no other TAC System DTCs are set, the TAC System will operate in Reduced Engine Power mode, and this DTC will be stored. This information will be stored in the Freeze Frame and Failure Records. The PCM will record operating conditions at the time the diagnostic fails. Action Taken When the DTC Sets The PCM will illuminate the malfunction indicator lamp (MIL) and the Reduced Engine Power light will be on when this diagnostic fails. Above condition met for less than 1 second. Conditions for Setting the DTC Invalid or missing serial data messages are detected for a predetermined amount of time. The ignition voltage is more than 5.23 volts. Conditions For Running the DTC The ignition is in the crank or run position. If a loss of data or invalid data is detected, this DTC will set. This diagnostic monitors the accuracy of the serial data transmitted between the TAC module and the PCM. Accurate transmitting and receiving of serial data requires not only good circuit integrity, but also adequate system voltage. This serial data circuit is separate from any other serial data circuit on the vehicle. 1 of 6 DTC P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit Circuit Description The throttle acuator control (TAC) module and the powertrain control module (PCM) communicate via a dedicated serial data circuit.
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