Hummer H2. Manual — part 1685
transistors change, this DTC sets. If this DTC does not fail this ignition, continue to monitor this DTC
status while moving related harnesses and connectors.
29: Locating and repairing an individual condition may correct more than one DTC.
DTC U0107
Step
Action
Values
Yes
No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Powertrain Control
Module (PCM) Connector End Views
1
Did you perform the Diagnostic System Check -
Engine Controls?
-
Go to Step 2
Go to
Diagnostic
System Check -
Engine
Controls
2
1. Turn ON the ignition, with the engine OFF.
2. Remove the cover from the underhood
electrical center.
3. Test both sides of the ETC fuse with a test
lamp connected to ground.
Does the test lamp illuminate on at least one side
of the fuse?
-
Go to Step 3
Go to Ignition
Relay Diagnosis
3
1. Turn OFF the ignition
2. Test for voltage at the ETC fuse with a test
lamp connected to ground.
Does the test lamp illuminate?
-
Go to Step 22
Go to Step 4
4
Connect a scan tool.
Is DTC P0604 also set?
-
Go to DTC P0601-
P0607, P1600,
P1621, P1627,
P1680, P1681,
P1683, or P2610
Go to Step 5
5
1. Start the engine.
2. Increase the engine speed to 3,000 RPM, if
possible.
3. Monitor the DTC Info option using the scan
tool.
Does the scan tool indicate this DTC failed this
IMPORTANT:
If the Driver Information Center is displaying
Reduced Engine Power, go to Step 6.
-
Go to Diagnostic
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -
Hummer H2
ignition?
Go to Step 6
Aids
6
1. Turn OFF the ignition.
2. Disconnect the throttle actuator motor
harness connector.
3. Turn ON the ignition, with the engine OFF.
4. Test for voltage at both throttle actuator
motor control circuits with a DMM.
Does the DMM indicate voltage on both circuits
above the specified value?
1 V
Go to Step 12
Go to Step 7
7
1. Turn OFF the ignition.
2. Disconnect the throttle actuator control
(TAC) module connectors.
3. Test both throttle actuator motor control
circuits for continuity to ground with a
DMM.
Does the DMM indicate continuity to ground?
-
Go to Step 10
Go to Step 8
8
1. Turn OFF the ignition.
2. Remove the ETC fuse.
3. Test the TAC side of the fuse terminal for
continuity to ground with a DMM. Refer to
Diagnostic Aids for terminal identification
table.
Does the DMM indicate continuity to ground?
-
Go to Step 9
Go to Step 11
9
1. Disconnect the TAC module 16-way harness
connector.
2. Test the TAC side of the fuse terminal for a
short to ground with a DMM. Refer to
Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 24
10
1. Disconnect the TAC module 16-way harness
connector.
2. Test the throttle actuator motor control
circuits for a short to ground at the TAC
module 16-way harness connector with a
DMM. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
-
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -
Hummer H2
Did you find and correct the condition?
Go to Step 28
Go to Step 24
11
1. Turn OFF the ignition.
2. Disconnect the TAC module 16-way harness
connector.
3. Test the TAC module ignition feed circuit
for an open or high resistance with a DMM.
Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 24
12
1. Turn OFF the ignition.
2. Disconnect the TAC module 16-way
connector.
3. Turn ON the ignition, with the engine OFF.
4. Test for a short to voltage at both throttle
actuator motor control circuits with a DMM.
Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 13
13
1. Turn OFF the ignition.
2. Disconnect the TAC module 10-way harness
connector.
3. Test for a short between each throttle
actuator motor control circuit and all other
TAC module circuits with a DMM. Refer to
Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 14
14
Test for an open or high resistance in the TAC
module ground circuit with a DMM. Refer to
Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 15
15
Test for voltage on the serial data circuits at the
TAC module 16-way harness connector with a
DMM.
Does the DMM indicate voltage within the
specified values for both circuits?
0-4.5
V
Go to Step 16
Go to Step 18
1. Turn OFF the ignition.
2. Test both serial data circuits at the TAC
module 16-way harness connector for
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -
Hummer H2
16
continuity to ground with a DMM.
Does the DMM indicate OL for both circuits?
-
Go to Step 20
Go to Step 17
17
1. Disconnect the powertrain control module
(PCM) connector containing the TAC
module serial data circuits.
2. Test both serial data circuits at the TAC
module 16-way connector for a short to
ground with a DMM. Refer to Circuit
Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 18
18
Test for a short between both serial data circuits
and all other circuits at the PCM and TAC module
harness connectors with a DMM. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 19
19
Test for a short to voltage on both serial data
circuits at the TAC module 16-way connector with
a DMM. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 25
20
1. Disconnect the PCM connector that contains
the TAC module serial data circuits.
2. Test each serial data circuit between the
TAC module 16-way harness connector and
the PCM harness connector for an open or
high resistance with a DMM. Refer to
Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
-
Go to Step 28
Go to Step 21
21
1. Connect the PCM.
2. Turn ON the ignition.
3. Test for voltage on the serial data circuit at
the TAC module 16-way harness connector
with a DMM.
Does the DMM indicate voltage at the specified
value?
0 V
Go to Step 25
Go to Step 24
1. Turn OFF the ignition.
2. Disconnect the 16-way TAC module harness
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -
Hummer H2
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