Hummer H1 Service Manual page 314

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DTC P1860 Torque Converter Clutch Pulse Width Modulation Solenoid Electrical (Cont'd)
Step
9 Replace the PCM. Refer to PCM Replacement/Pro-
gramming , Section 6.
Is the replacement complete?
10 1. Disconnect the internal wiring harness at the TCC
PWM Sol. Valve.
2. Measure the resistance of the TCC PWM Sol.
Valve.
Is the resistance within the specified values?
11 Measure the resistance between terminal E and ground
and terminal S and ground.
Are both readings greater than the specified value?
12 Inspect the internal wiring harness for an open circuit.
Refer to Electrical Diagnosis, Section 8.
Did you find a problem?
13 1. Disconnect the internal wiring harness at the TCC
PWM Sol. Valve.
2. Measure the resistance between each of the com-
ponent terminals and ground.
Are both readings greater than the specified value?
14 Inspect the internal wiring harness for a short to
ground. Refer to Electrical Diagnosis, Section 8
Did you find a problem?
15 Replace the TCC PWM Sol. Valve. Refer to 4L80-E
On-Vehicle Service.
Is the replacement Complete?
16 Replace the Automatic Transmission Wiring Harness
Assembly (A/T Wiring Harness Assy). Refer to 4L80-E
On-Vehicle Service.
Is the replacement complete?
17 In order to verify your repair, perform the following
procedure:
1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:
• The TCC PWM Sol. Valve is commanded ON
and the volts drop to zero.
• The TCC PWM Sol. Valve is commanded OFF
and the volts increase to B+.
• All conditions are met for 5 seconds.
4. Select Specific DTC. Enter DTC P1860.
Has the test run and passed?
05745159
Action
Transmission/Transfer Case
Value
—
Go to Step 17
10-15
Go to Step 12
250 Go to Diag-
nostic Aids
—
Go to Step 16
250
Go to Step 14
—
Go to Step 16
—
Go to Step 17
—
Go to Step 17
—
System OK
5-115
Yes No
—
Go to Step 15
Go to Step 13
—
Go to Step 15
—
—
—
Begin the
diagnosis
again. Go to
Step 1