Hummer H1 Service Manual page 294

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DTC P0753 1-2 Shift Solenoid Valve Electrical (Cont'd)
Step
4 1. Turn the ignition "off" long enough to power down
PCM.
2. Disconnect the transmission 20-way connector
(additional DTCs will set).
3. Install the jumper harness 05743837 on the engine
side of the 20-way connector.
4. With the engine off, turn the ignition switch to the
"Run" position.
5. Connect a test lamp from the jumper harness
05743837 cavity E to a good ground.
Does the test lamp illuminate?
5 Repair the open or short to ground in the ignition feed
circuit to the 1-2 shift solenoid.
Was a problem found and corrected?
6 1. Install a test lamp between cavity E and Cavity A
of the jumper harness.
2. Using the transmission output control function on
the scan tool, command the 1-2 shift solenoid
valve "On" and "Off" three times.
Does the test lamp illuminate when the shift solenoid is
commanded "On" and turn off when the shift solenoid
is commanded "OFF"?
7 Inspect/repair circuit 237 for an open or short to ground
condition.
Was a problem found?
8 Replace the PCM.
Is the replacement complete?
9 1. Turn ignition switch to the "Off" position.
2. Connect 05743837 Jumper Harness to transmis-
sion 20-way connector.
3. With DVOM and Connector Test Adapter Kit,
measure the resistance between terminals "A" and
"E."
Is resistance within the indicated values?
10 1. Remove oil pan and disconnect the internal wiring
harness from the 1-2 shift solenoid.
2. Measure 1-2 shift solenoid resistance.
Is resistance within the indicated values?
11 Using multimeter, measure resistance between termi-
nals "A" and ground and "E" and ground.
Are both readings greater than indicated value?
05745159
Action
Transmission/Transfer Case
Value
— Go to step 6.
— Go to step 16.
— Go to step 9.
— Go to step 15.
— Go to step 15.
19-31 ohms Go to step 11.
19-31 ohms Go to step 13.
250K Ω
Go to the diag-
nostic aids.
5-95
Yes No
Go to step 5.
—
Go to step 7.
Go to step 9.
—
Go to Step 10.
Go to step 14.
Go to step 12
3-1-01