GR_CM in DRIVE MODE

This OSC function is used to test the transmission shift functions.

The OSC functions for the GR_CM parameter allows the technician to choose the following options:

• 1 - PCM selects 1st gear.
• 2 - PCM selects 2nd gear.
• 3 - PCM selects 3rd gear.
• 4 - PCM selects 4th gear.

OSC "GR_CM" Mode operates ONLY when:

• the digital TR sensor is operational and no digital TR sensor DTCs are present.
• the vehicle speed sensor is operational and no VSS sensor DTCs are present.
• the engine is ON.
• the TCC is OFF.
• the transmission range selector lever is in O/D.
• the vehicle speed is greater than 3.2 km/h (2 mph).

OSC Command Values

• 1 - PCM selects 1st gear.
• 2 - PCM selects 2nd gear.
• 3 - PCM selects 3rd gear.
• 4 - PCM selects 4th gear.
• XXX - cancels OSC value sent.
• SEND - sends the values to PCM.