P128E-TCM POWER CONTROL CIRCUIT 2 OVERCURRENT - TIPM
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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TRANSMISSION SOLENOID/TRS ASSEMBLY
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POWERTRAIN CONTROL MODULE (PCM)
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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 a scan tool, read TIPM DTCs.
Is the DTC active at this time?
Yes
No
2.
CHECK THE (T16) TRANSMISSION CONTROL OUTPUT
Turn the ignition off to the lock position.
Disconnect the TIPM C2 harness connector.
Connect the positive probe of an ammeter to battery positive and connect the negative probe to the (T16) Transmission Control Output circuit in the TIPM C2 harness connector.
Read the amperage on the ammeter.
Does the amperage read below 2.0 amps?
Yes
No
3.
CHECK THE PCM
Disconnect the ammeter from the TIPM C2 harness connector and battery positive.
Disconnect the PCM C4 harness connector.
Reconnect the positive probe of an ammeter to battery positive and connect the negative probe to the (T16) Transmission Control Output circuit in the TIPM C2 harness connector.
Read the amperage on the ammeter.
Does the amperage read below 2.0 amps?
Yes
-
Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention
to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN
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Perform 545RFE TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)
No
4.
CHECK THE TRANSMISSION SOLENOIDS
Disconnect the ammeter from the TIPM C2 harness connector.
Disconnect the PCM C4 harness connector and install Miller tool #8815.
Connect the positive probe of an ammeter to battery positive and connect the negative probe to the (T16) Transmission Control Output circuit in the TIPM C10 harness connector.
While monitoring the amperage reading of the ammeter and using a jumper wire, jump each solenoid control circuit to ground one at a time in the appropriate terminals of Miller tool #8815.
NOTE:
The amperage draw should be approximately .02 milliampere on each solenoid circuit with the PCM C4 harness connector disconnected.
Does the amperage read between .05 and .015 milliampere (+/-.005 milliampere) on each solenoid tested?
Yes
No
5.
INTERMITTENT WIRING AND CONNECTORS
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.
Were there any problems found?
Yes
No