10. Checking N3 Input Speed Sensor W/ Lab Scope

With the ignition off.

Reconnect the TCM C2 harness connector.

Reconnect the Transmission Solenoid Assembly harness connector.

Turn the ignition on.

With the DRB III®/PEP Module being used as a Dual Channel Lab Scope with Miller special tool #6801, backprobe N3 Input Speed Sensor Signal circuit using Channel 1 at the TCM C2 harness connector.

WARNING: PROPERLY SUPPORT THE VEHICLE.

Raise all drive wheels off the ground.

Start the engine.

WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS.

Place gear selector in drive and increase vehicle speed to engage 2nd gear.

Compare the scope pattern on the DRB III® with a typical 5 volt square wave pattern.

Fig 1: Checking N3 Input Speed Sensor W/Lab Scope

Courtesy of DAIMLERCHRYSLER CORP.

Does the scope pattern match a typical 5 volt square wave signal scope pattern?

Yes >> Replace the Transmission Control Module. See TRANSMISSION CONTROL MODULE .
See TRANSMISSION VERIFICATION TEST .
No >> Replace the N3 Input Speed Sensor. See SERVICING - A/T article.
See TRANSMISSION VERIFICATION TEST .