P2534

DTC P2534

Diagnostic Instructionse0m
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure.
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC P2534 Ignition 1 Switch Circuit Low Voltage

Circuit/System Description
The transmission control module (TCM) continuously monitors the ignition voltage circuit. A low ignition voltage reading at the TCM will cause DTC P2534 to set.

Conditions for Running the DTC
^ No Engine Speed Circuit Malfunction, DTC P0727.
^ No Lost Communications with the ECM, DTC U0100.
^ NO CAN Bus Reset Counter Overrun, DTC U2104.
^ Engine speed is 400 RPM or greater.
^ Battery Voltage is greater than 9.0 volts.
^ Not in Emergency Mode.

Conditions for Setting the DTC
The TCM detects that ignition voltage is less than 8.68 volts for 20 seconds.

Action Taken When the DTC Sets
^ DTC P2534 is a Type A DTC.
^ The transmission will operate in 5th gear in D range, 2nd gear in L range.

Conditions for Clearing the DTC
DTC P2534 is a Type A DTC.

Diagnostic Aids
A charging system malfunction may cause variances in system voltage and set voltage related DTCs.

Circuit/System Verification
Engine running, verify the transmission control module (TCM) scan tool ignition voltage parameter is greater than 8.68 volts.
> If not greater than the specified range, perform Charging System Test before performing Circuit/System Testing.

Circuit/System Testing

NOTE:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the C1 harness connector at the TCM.
2. Test for less than 1.0 Ohms of resistance between ground circuit terminal 9 and ground.
> If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 11 and ground.
> If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the TCM.
4. If all circuits test normal, replace the TCM.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure.