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P0870-OD HYDRAULIC PRESSURE TEST FAILURE —
TEST
5
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.
Note: Check connectors - Clean/repair as necessary.
With the Transmission Simulator select the OD Pressure Switch.
With the DRBIII , monitor the OD Pressure Switch state in the following step:
Wiggle the wiring and connectors pertaining to this circuit while pressing the
Pressure Switch Test button on the Transmission Simulator.
Did the OD Pressure Switch state change to closed and remain closed while wiggling
the wires?
Yes → Go To 6
→ Go To 7
No
6
If there are no possible causes remaining, view repair.
Repair
7
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the Transmission Solenoid/Pressure Switch Assembly 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 OD Pressure Switch Sense circuit from the appropriate
terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assem-
bly harness connector.
Is the resistance above 5.0 ohms?
Yes → Repair the OD Pressure Switch Sense circuit for an open.
→ Go To 8
No
ACTION
Disassemble and inspect the Valve Body per the Service Informa-
tion and repair or replace as necessary. If no problems are found in
the Valve Body, replace the Transmission Solenoid/Pressure
Switch Assembly per the Service Information.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
TRANSMISSION - NGC
253
Continued
APPLICABILITY
All
All
All
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