P2534
DTC P2534
Circuit Description
The transmission control module (TCM) samples the system voltage on the Ignition 1 voltage circuit every 0.1 seconds. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal damage.
If the TCM detects low voltage on the Ignition 1 voltage circuit, DTC P2534 sets. DTC P2534 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2534 Ignition 1 Switch Circuit Low Voltage
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The TCM detects an open or short to ground on the Ignition 1 voltage circuit.
Action Taken When the DTC Sets
* The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL).
* The TCM commands an immediate landing to 2nd gear.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
* The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
Conditions for Clearing the DTC
* The ECM turns OFF the MIL after the third consecutive trip in which the TCM does not send a MIL illumination request.
* The TCM clears the DIC message when the condition no longer exists.
* A scan tool can clear the DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
* The TCM cancels the DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.
