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TRANSMISSION - NGC
P1794-SPEED SENSOR GROUND ERROR —
TEST
2
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 , monitor the Input and Output Speed Sensor readings.
Does the Input Speed read 3000 RPM and the Output Speed read 1250 RPM, ± 50
RPM?
Yes → Go To 3
→ Go To 4
No
3
The conditions necessary to set the DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wires while checking for shorted and open circuits.
With the DRBIII , check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
Yes → Repair as necessary.
→ Test Complete.
No
4
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Input and Output Speed Sensor harness connectors.
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 Speed Sensor Ground circuit from the appropriate
terminal of special tool #8815 to the Input and Output Speed Sensor harness
connectors.
Is the resistance above 5.0 ohms on either circuit?
Yes → Repair the Speed Sensor Ground circuit for an open.
→ Go To 5
No
5
Using the schematics as a guide, inspect the wiring and connectors. Repair as
necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
ACTION
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Replace and program the Powertrain Control Module per the
Service Information. WITH THE DRBIII
LEARN AND REPROGRAM PINION FACTOR.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Continued
PERFORM QUICK
302
APPLICABILITY
All
All
All
All
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