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P0720-OUTPUT SPEED SENSOR ERROR —
TEST
2
Start the engine in park.
Raise the drive wheels off of the ground.
WARNING: PROPERLY SUPPORT THE VEHICLE.
Firmly apply the brakes and place the transmission selector in drive.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Release the brakes and allow the drive wheels to spin freely.
Note: The drive wheels must be turning at this point.
With the DRBIII , read the Output RPM
Is the Output RPM below 100?
Yes → Go To 3
→ Go To 11
No
3
Turn the ignition off to the lock position.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO
RESPONSE, condition and disable the starter.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmis-
sion Adapter kit 8333-1A.
Ignition on, engine not running.
With the Transmission Simulator, set the Input/Output Speed switch to ON and
the rotary switch to the 3000/1250 position.
With the DRBIII , read the Input and Output RPM.
Does the Input RPM read 3000 and the Output RPM read 1250 (within 50 RPM)?
Yes → Go To 4
→ Go To 5
No
4
If there are no possible causes remaining, view repair.
Repair
5
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Output Speed Sensor Signal circuit from appropriate
terminal of special tool #8815 to the Output Speed Sensor harness connector.
Is the resistance above 5.0 ohms?
Yes → Repair the Output Speed Sensor Signal circuit for an open.
→ Go To 6
No
ACTION
Replace the Output Speed Sensor per the Service Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
TRANSMISSION - NGC
Continued
203
APPLICABILITY
All
All
All
All
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