Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and
15.0 V.
锟斤拷If not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests
and General Diagnostics/Charging System Test).
2. Observe the scan tool Trailer Brake Control Module Battery Voltage Signal. The reading should be between 12.6 and 15.0 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the K67 trailer brake control module.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 15 and ground.
锟斤拷If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. If all circuits test normal, replace the K67 trailer brake control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for the trailer brake control module replacement, setup and
programming
6L50/6L80/6L90 - Automatic Transmission
DTC P2534
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions)provides an overview of each diagnostic category.
DTC Descriptor
DTC P2534
- Ignition 1 Switch Circuit Low Voltage
Circuit/System 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.
Conditions for Running the DTC
* The engine speed is greater than 500 RPM.
* Ignition voltage is between 8.6-19.0 volts.
Conditions for Setting the DTC
The TCM detects 6 volts or less on the ignition 1 voltage circuit at the TCM for 1.0 second or more.
Action Taken When the DTC Sets
* DTC P2534 is a Type A DTC.
* The TCM turns OFF HSD1 and HSD2.
* The TCM turns OFF all solenoids.
