Bench Testing the 6L50-6L80-6L90-6T70-6T75 TEHCM
Figure 2A
Figure 2B The process is the same for both
RWD and FWD 6-speed applications, although the harness interface part numbers will vary with the application. To bench test the TEHCM:
• Remove the TEHCM from the transmission or transaxle.
• Attach the DT47825 test block to the TEHCM using the bolts supplied with the tool. Torque the bolts to 44 lb-in (5 Nm) working from the center out.
• Install the pressure gauge sup- plied with the tool to the sole- noid you want to test.
• Connect the appropriate interface harness between the TEHCM and the vehicle harness. • Key on, engine off.
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• Connect your scan tool to the vehicle, and select output over- rides to allow you to cycle the solenoids on and off with your scan tool.
• Attach shop air to the DT47825 test block; adjust to 90-100 PSI (figure 1).
• Cycle the solenoid on and off with your scan tool while mon- itoring the gauge on the test block.
When you’re done testing a sole-
noid, simply move the pressure gauge to another port on the test block and repeat the procedure until you’ve tested each solenoid multiple times. Note: A solenoid timeout feature
will prevent you from operating the solenoids too long. This is designed to prevent damage to the TEHCM. Refer to the GM diagnostic charts
to determine when the gauge should read or not read pressure (figures 2a and 2b). If the TEHCM fails to operate as indicated, you’ll need to clean or replace the TEHCM. NOTE: With the key on, engine
off, the TEHCM will normally cycle some of the solenoids on and off; this is part of the software program. This means you may appear to have air flow from some of the test plate ports prior conducting the test. This is normal and it’s part of the solenoid cleaning pro- gram that the TEHCM conducts.
GEARS August 2012
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