TEST ACTION APPLICABILITY
2 With the DRBIIIt, read Transmission DTC’s.
If any of these DTC’s are present, perform their respective tests first.
Are there any Loss of Prime, Line Pressure Sensor and/or Speed Sensor DTCs
present?
All
Yes → Refer to the Transmission category and perform the appropriate
symptom. If any of theseDTC’s arepresent, theywill cause a gear
ratio error. Perform the test for Loss of Prime first if it is present.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Go To 3
3 With the DRBIIIt, perform the 4th gear clutch test. Follow the instructions on the
DRBIIIt.
Increase the throttle angle or TPS Degree to 30° for no more than a few seconds.
CAUTION: Do not overheat the transmission.
Did the clutch test pass - Input Speed remain at zero?
All
Yes → Go To 4
No → Go To 5
4 The conditions to set this DTC are not current at this time.
Check the gearshift linkage adjustment.
Gear ratio DTC’s can be set by problems in the Input and Output Speed Sensor
circuits. If the vehicle passes the clutch test and still sets gear ratio DTC’s, check the
Speed Sensors for proper operation.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO
RESPONSE, condition and disable the starter.
Check the Speed Sensor wiring and connectors for good connection, then perform a
wiggle test using the Transmission Simulator, Miller tool #8333 and the Electronic
Transmission Adapter kit 8333-1A.
This DTC can also be set under extreme temperature conditions, this is usually
caused by an internal problem. Verify if the problem is only experienced under
extreme hot or cold conditions.
With the DRBIIIt, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
All
Yes → Repair as necessary.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Test Complete.
5 With the DRBIIIt, read Transmission DTC’s.
Are the DTC’s P0870 and/or P0871 present also?
All
Yes → Replace the Solenoid/Pressure Switch Assembly per the Service
Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
No → Go To 6
81
TRANSMISSION - NGC
P0734-GEAR RATIO ERROR IN 4TH — Continued
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