PD Test is used to diagnose Inactive fault codes that may have set during normal operation. PD Test is a “Wiggle Test” used to identify intermittent Open or Short circuit conditions in a connector, component, or wire in a circuit. PD Test increases the fault sensing capability of the Transmission Control Module (TCM) making it more likely to detect any intermittent electrical or wiring issues as a result of loose or degraded 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

• Once the PD Test is activated, wiggle the wiring harness and connector bodies appropriate for the intermittent fault condition.
• During the PD Test fault isolation procedure “PD” will remain in display until an Active fault code has been set.
• If an Active fault code is set, the display will flash “F” and “PD”. A warning tone will sound when the fault code is Active. “F” and “PD” will continue to be shown in the display until the key is turned off and the TCM has performed a complete power 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 fault codes set Active, refer to OEM guidelines for repair or replacement of vehicle harness and/or 20-Way TCM Vehicle Harness Connector.
• Refer to the Fault Code Isolation Procedure Index for the troubleshooting procedures for a specific fault code.