Hummer H1 Service Manual page 313

5-114 Transmission/Transfer Case
DTC P1860 Torque Converter Clutch Pulse Width Modulation Solenoid Electrical
Step
1 Was the Powertrain On-Board Diagnostic (OBD) Sys-
tem Check performed?
2 1. Install the scan tool (Tech 1).
2. With the engine OFF, turn the ignition switch to
the RUN position.
3. Important: Before clearing the DTCs, use the scan
tool in order to record the Freeze Frame and Fail-
ure Records for reference. The Clear Info function
will erase the data
4. Record the DTC Freeze Frame and Failure
Records.
5. If DTCs P0753, P0758, or P1860 are set, inspect
the fuse.
Is the fuse blown?
3 Inspect circuit 1020, the TCC PWM Sol. Valve and the
internal wiring harness for a short to ground. Refer to
Electrical Diagnosis, Section 8.
Did you find and correct a problem?
4 1. Turn the ignition OFF.
2. Disconnect the transmission 20-way connector
(additional DTCs may set).
3. Install the J–39775 Jumper Harness on the engine
harness connector.
4. With the engine off, turn the ignition to the RUN
position.
5. Connect a test lamp from the J–39775 Jumper Har-
ness cavity E to ground.
Is the test lamp ON?
5 Repair the open or high resistance located in ignition
voltage feed circuit 1020 to the TCC PWM Sol. Valve.
Refer to Electrical Diagnosis, Section 8.
Is the repair complete?
6 1. Install the test lamp from cavities E to S of the J–
39775 Jumper Harness.
2. Use the scan tool in order to command the TCC
PWM Sol. Valve ON and OFF three times.
Does the test lamp turn ON when you command the
TCC PWM Sol. Valve ON, and does the lamp turn OFF
when you command the TCC PWM Sol. Valve OFF?
7 Inspect and repair circuit 418 for an open or short to
ground. Refer to Electrical Diagnosis, Section 8.
Did you find a problem?
8 1. Install the J–39775 Jumper Harness on the trans-
mission 20-way connector.
2. Measure the resistance between terminals E and S.
Use the J–39200 DVOM and the J–35616-A Con-
nector Test Adapter Kit (Both covered in Electrical
Section 12).
Is the resistance within the specified values?
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Action Value Yes
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Go to Step 2
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Go to Step 3
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Go to Step 17
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Go to Step 6
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Go to Step 17
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Go to Step 8
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Go to Step 17
10-15
Go to Step 11
®
No
Go to Power-
train OBD
System Check
Go to Step 4
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Go to Step 5
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Go to Step 9
Go to Step 10