P128B-TCM POWER CONTROL CIRCUIT 2 LOW - TIPM
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO GROUND
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(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN
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TOTALLY INTEGRATED POWER MODULE (TIPM)
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Diagnostic Test
1.
CHECK IF THE DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, check TIPM DTCs.
Is the status Active for this DTC?
Yes
No
2.
CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the TIPM C2 harness connector.
Disconnect the PCM C4 harness connector and install Miller tool #8815.
CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller
tool #8815 to perform diagnosis.
Measure the resistance between ground and the (T16) Transmission Control Output circuit.
Is the resistance below 5.0 ohms?
Yes
No
3.
CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Connect the TIPM C2 harness connector.
Disconnect the Transmission Solenoid/Pressure Switch harness connector.
Disconnect the Line Pressure Sensor/Variable Force Solenoid harness connector (if equipped).
Ignition on, engine not running.
Using the scan tool under the TIPM Actuators, actuate the Transmission.
Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuits.
NOTE:
The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly at all the (T16) Transmission Control Output circuits?
Yes
No
4.
TOTALLY INTEGRATED POWER MODULE
Using the schematics as a guide, inspect the wire harness and connectors.
Check the TIPM harness connector terminals for corrosion, damage, or terminal push out.
Pay particular attention to all power and ground circuits.
Were any problems found?
Yes
No
5.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?
Yes
No