DTC P2534
Diagnostic Instructions
DTC Descriptor
DTC P2534: Ignition On/Start Switch Circuit Low
Voltage
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Ignition 1 voltage
|
P2534 open fuse
|
P2534
|
-
|
P0562, P0563
|
Circuit/System Description
The transmission control module (TCM) continuously monitors
the system voltage on the TCM Ignition voltage circuit. 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 control module (ECM) communicates that the
engine is running through the controller area
network (CAN).
Conditions for Setting the DTC
The TCM detects 6 volts or less on the ignition voltage
circuit at the TCM for 7 seconds.
Action Taken When the DTC Sets
| • |
DTC P2534 is a Type A DTC. |
| • |
The TCM turns OFF all high side drivers. |
| • |
The TCM turns OFF all solenoids. |
| • |
The TCM commands maximum line pressure. |
| • |
The TCM freezes transmission adaptive
functions. |
| • |
The TCM commands the torque converter
clutch (TCC) OFF. |
| • |
The TCM limits the transmission to reverse and 5th
gear. |
| • |
The TCM inhibits the Tap Up/Tap Down
function. |
| • |
The TCM inhibits manual shifting of forward
gears. |
Conditions for Clearing the DTC
DTC P2534 is a Type A DTC.
Diagnostic Aids
| • |
Observe the driver information centre (DIC)
messaging that would indicate the electrical system requires
service. |
| • |
Inspect for the following conditions: |
| - |
Loose or damaged terminals at the generator |
| - |
Loose or worn generator drive belt |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-48616-10 Adapter Harness
For equivalent regional tools, refer to
Special Tools .
Circuit/System Verification
- Engine ON, accessories OFF, measure and record the
battery voltage at the battery terminals. The voltage should be
between 12.6-15.0 volts.
| ⇒ |
If the voltage is not within the specified range,
or the charge indicator light is on, refer to
Charging System Test . |
- Observe the scan tool TCM Ignition Voltage parameter.
The reading should be between 12.6-15.0 volts.
- After performing the above steps, verify that the DTC
does not reset by operating the vehicle within the Conditions for
Running the DTC. You may also operate the vehicle within the
conditions you observe from the Freeze Frame/Failure Records data.
If the vehicle passes the Circuit/System Verification procedure,
then STOP. Do not perform the Circuit/System Testing or Component
Testing as this may result in an unnecessary part replacement.
Refer to
Testing for Intermittent Conditions and Poor Connections .
Circuit/System Testing
- Ignition OFF, disconnect the X1 14-way harness
connector at the transmission.
- Connect the DT-48616-10 harness to the
vehicle wire harness X1 14-way transmission connector.
- Test for less than 10 ohms between the ground
circuit terminal 2 and ground.
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, verify that a test lamp illuminates
between the B+ and ignition circuit terminals listed below and
ground.
| ⇒ |
If the test lamp does not illuminate, test the
affected B+ or ignition circuit for a short-circuit to ground or an
open/high resistance. |
- If all circuits test normal, replace the Q8 control
solenoid valve assembly. Refer to
Control Solenoid Valve and Transmission Control Module Assembly
Replacement .
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
