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DTC P2534 or P2537

DTC P2534 or P2537

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P2534 00

Ignition Voltage Out of Range Malfunction

DTC P2537 00

Accessory Power Circuit Malfunction

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Ignition

P2534 00

P2534 00

-

-

Accessory Ignition

P2537 00

P2537 00

-

-



Circuit/System Description

The transmission control module (TCM) continuously monitors the system voltage on the ignition and the accessory ignition circuit. Lower than normal voltage may be inadequate to operate the transmission control solenoids properly.

Conditions for Running the DTC


• The engine speed is greater than 400 RPM.

• Ignition voltage is between 10.2-18.0 V.


Conditions for Setting the DTC

P2534 00

The TCM detects that the ignition voltage is less than 8.6 V for 1 s.

P2537 00

The TCM detects that the accessory ignition voltage is less than 8.6 V for 1 s.

Action Taken When the DTC Sets

P2534 00

DTC P2534 is a Type B DTC.

P2537 00

DTC P2537 is a Type C DTC.

Conditions for Clearing the DTC

P2534 00

DTC P2534 is a Type B DTC.

P2537 00

DTC P2537 is a Type C DTC.

Reference Information

Schematic Reference


• Automatic Transmission Controls Schematics

• Power Distribution Schematics


Connector End View Reference

Component Connector End Views

Description and Operation


• Transmission System Description and Operation (M36 and MXE)

• Power Mode Description and Operation


Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, observe the Ignition Voltage Signal parameter. The reading should be 12-15 V.

Circuit/System Testing


1. Ignition OFF, key out, measure the battery voltage at the battery terminals. Verify the voltage is 11-13 V.

2. If not within the specified range, refer to Charging System Test .

3. Disconnect the X1 harness connector at the K71 Transmission Control Module.

4. Test for less than 5 Ω between the ground circuit terminal 9 X1 and ground.

5. If greater than the specified range, test the ground circuit for an open/high resistance.

6. Test for greater than 11 V between the B+ circuit terminal 1 X1 and ground.

7. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.

8. Ignition switch in the ACCESSORY position, test for greater than 11 V between the accessory ignition circuit terminal 12 X1 and ground.

9. If less than the specified value, test the accessory ignition circuit for a short to ground or an open/high resistance.

10. Ignition switch in the RUN position, test for greater than 11 V between the ignition circuit terminal 11 X1 and ground.

11. If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance.

12. If all circuits test normal, replace the K71 Transmission Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for TCM replacement, setup and programming