Output Test Mode

The Output Test Mode (OTM) aids in servicing output actuators associated with the PCM. It allows the technician to energize and de-energize most of the system output actuators on command. When entering OTM, the outputs can be fumed off and on without controlling the cooling fans. The low and high speed cooling fans may be turned on separately without energizing the other outputs.

CAUTION: Safety must be observed when using output test mode. When all outputs are on and the electric fuel pump is energized, make sure the fuel system is intact and is not being serviced at that time. When low speed or high speed cooling fans are turned on, make sure fan blades are clear of any obstruction.

NOTE: As a safety precaution, the Output Test Mode will default to its normal state after ten minutes, after the vehicle is started or after cycling the ignition switch off and on.

Accessing Output Test Mode New Generation Star
Enter OTM with the ignition switch ON and the engine off.
Perform the necessary vehicle preparation and visual inspection.
- Connect scan tool to DLC.
- Select "vehicle" and "engine selection" menu.
- Select "new vehicle year & model".
- Enter year, engine, model with the appropriate qualifier, if needed (i.e., transmission, 49-State or California). Select "diagnostic data link".
- Select "PCM - powertrain control module".
- Select "active command modes".
- Select "output test mode"
- Turn ignition switch ON.
- Follow operating instructions from the menu.
- Select the mode (i.e., "all on", "all off", "high speed fan" or "low speed fan").
- Select "start" to turn outputs "on" (may link up to PIDs).
- Select "stop" to turn outputs "off".