Product Diagnostic (PD) Mode

PD Mode is used to help diagnose Inactive codes that may have been set during normal driving. This diagnostic mode increases the sensitivity of the fault sensing capability

This procedure tests loose, degraded and intermittent connections. Use the Active Fault Isolation Procedure to guide you to the wiring and connectors that are associated with the Inactive fault codes. Flex the wiring harness and connectors and attempt to recreate the fault after activating PD Mode.

PD Mode is only to be used by a trained service technician in an authorized dealer.

This procedure is to be used prior to performing fault isolation procedures for component-type codes when there are no Active codes present.

To enter PD Mode:

Note: Vehicle will not start in PD Mode. You must turn vehicle key off to exit PD Mode.

• Vehicle must be stationary, engine off, set vehicle parking brake.
• Turn the key off and on 2 times, starting with key on and ending with key on.

  Note: Dash may display an 88 at key on. This is a normal power-up test of the display.

• The gear display will flash a 25 then a solid PD (Product Diagnostic Mode) and the mode will be activated.
• The service light shall flash code 25 once indicating no codes. The service light shall then illuminate solid to indicate PD Mode until such time that an Active code is detected or PD Mode is exited.
• Refer to PD Mode section in Fault Isolation procedure for the Inactive fault to be diagnosed.
• PD will remain in gear display until an active fault has been set during the PD Mode fault isolation procedure.
• If the fault is detected during PD Mode the gear display will display the active fault. The warning tone will only sound when the fault is active and the tone will stop when the fault is Inactive. The fault will stay in the gear display until the system is powered down.

  Note: Active codes set during PD Mode will not be stored as Inactive.

• If a fault is detected, exit PD Mode and perform the corresponding Fault Isolation Procedure.
• To exit PD Mode, turn the key off.

PD Mode works with the following Inactive codes:

11, 13, 14, 15,16, 17, 18, 19, 21, 22, 29, 33, 34, 35, 36, 43, 44, 46, 51, 52, 56, 57, 58, 61, 63, 65, 66, 67, 74, and 99.