PD Test is used to diagnose Inactive fault codes that may have set during normal operation. This diagnostic test increases the fault sensing capability of the transmission system, making it more likely to detect intermittent electrical or wiring issues. The PD Test procedure tests loose, degraded and intermittent connections.

When troubleshooting an Inactive fault code, use the Fault Isolation Procedures to guide you to the wiring and connectors associated with that fault. Once PD Test is activated, flex the wiring harness and connectors to attempt to recreate the fault.

This procedure may be used prior to performing any troubleshooting or as directed by a Fault Isolation Procedure. PD Test may be used to troubleshoot intermittent electrical fault issues when there are no Active fault codes present.

Note: The vehicle will not start in PD Test. You must turn vehicle key off, and allow the transmission to fully power down to exit PD Test before the vehicle will start.

PD Test Inactive Fault Codes

PD Test supports specific Inactive fault codes and their associated FMIs. To verify PD Test supports the fault code and FMI set, reference the Fault Code Isolation Procedure Index.

Entering PD Test

Note: Vehicle must have no Active fault codes.

Note: Vehicle must be stationary, engine off with vehicle parking brake set.

• Key on with engine off.
• Connect ServiceRanger.
• Go To “Service Routines”
• Start “Product Diagnostic Test” and follow on-screen prompts.

Note: Solid “PD” may appear in display when PD Test is active.

Troubleshooting Using PD Test

• Wiggle the wiring harness and connector bodies appropriate for the intermittent fault condition while the transmission is in PD Test.
• “PD” will remain in display until an Active fault code has been set during the PD Test fault isolation procedure.
• If an Active fault code is set during PD Test, the display will flash “F” and “PD” until PD Test is completed. A warning tone will sound when the fault code is Active. “PD” will continue to be shown in the display until the transmission has powered down.
• Fault codes that occur in PD Test will not be stored in the TCM as Inactive fault codes.

Identifying a Problem in PD Test

• Identify any areas of wear or damage to wiring harnesses or connectors.
• If a fault occurs while wiggling the wiring harness and/or connector, exit PD Test. Disconnect the connector and inspect both sides for damage, corrosion and spread or loose pins.
• Refer to the Fault Code Isolation Procedure Index for the troubleshooting procedures for a specific fault code.