Hummer H2. Manual — part 1629
DTC P0120
Step
Action
Values
Yes
No
Schematic Reference:Engine Controls Schematics
Connector End View Reference:Engine Controls Component 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 OFF the ignition.
2. Remove the air inlet duct from the throttle body.
3. Disconnect the throttle body harness connector.
4. Connect the jumper wires between the throttle
position (TP) sensor 1 terminals of the throttle
body harness connector and the corresponding
TP sensor 1 terminals of the throttle body.
5. Turn ON the ignition, with the engine OFF.
6. Close the throttle blade by hand.
7. Observe the TP sensor 1 voltage with a scan tool.
Is the TP sensor 1 voltage within the specified range?
0.37-
0.71 V
Go to Step 5
Go to Step 3
3
1. Turn OFF the ignition.
2. Connect jumper wires between the TP sensor 2
terminals of the throttle body harness connector
and the corresponding TP sensor 2 terminals of
the throttle body.
3. Turn ON the ignition, with the engine OFF.
4. Close the throttle blade by hand.
5. Observe the TP sensor 2 voltage with a scan tool.
Is the TP sensor 2 voltage within the specified range?
0.28-
0.81 V
Go to Step 9
Go to Step 4
4
Is DTC U0107 also set?
-
Go to
Diagnostic
Trouble Code
(DTC) List
Go to Step 9
5
1. Open the throttle blade to wide open throttle
(WOT) by hand.
2. Observe the TP sensor 1 voltage parameter on
the scan tool.
Is the TP sensor 1 voltage parameter more than the
specified value?
4.51 V
Go to Step 9
Go to Step 6
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L -
Hummer H2
6
1. Disconnect the TP sensor harness connector.
2. Disconnect the throttle actuator control (TAC)
module harness connector containing the TP
sensor circuits.
3. Test the TP sensor low-reference circuit 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 32
Go to Step 7
7
1. Turn OFF the ignition for 15 seconds.
2. Connect the TAC module harness connector.
3. Connect the throttle body harness connector.
4. Install the air inlet duct.
5. Turn ON the ignition, with the engine OFF.
6. Select the DTC Info option on the scan tool.
7. Lightly touch and move the related engine wiring
harnesses and connectors for the TP sensor while
observing the DTC Info. The DTC will set if an
intermittent condition is present. Refer to
Connector Repairs and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
-
Go to Step 32
Go to Step 8
8
1. Continue to observe the DTC Info.
2. Slowly depress the accelerator pedal to WOT,
then slowly return the pedal to the released
position 3 times.
Does the scan tool indicate this DTC failed this
ignition?
-
Go to Step 27
Go to Diagnostic
Aids
9
1. Disconnect the TP sensor harness connector.
2. Measure the voltage at the TP sensor 1 signal
circuit with a DMM connected to ground.
Is the voltage within the specified range?
3.94-
6.06 V
Go to Step 14
Go to Step 10
10
1. Turn OFF the ignition.
2. Disconnect the TAC module harness connector
containing the TP sensor circuits.
3. Turn ON the ignition, with the engine OFF.
4. Test the TP sensor 1 signal circuit for a short to
voltage with a DMM. Refer to Circuit Testing
-
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L -
Hummer H2
and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 32
Go to Step 11
11
Test the TP sensor 1 signal 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 32
Go to Step 12
12
Test the TP sensor 1 signal circuit 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 32
Go to Step 13
13
1. Disconnect the other TAC module harness
connector.
2. Test for a short between the TP sensor 1 signal
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 32
Go to Step 28
14
Measure the voltage from the TP sensor 1 5-volt
reference circuit to a good ground with a DMM. Refer
to Circuit Testing in Wiring Systems.
Is the voltage within the specified range?
4.54-
5.21 V
Go to Step 24
Go to Step 15
15 Is the voltage more than the specified value?
5.21 V
Go to Step 16
Go to Step 18
16
1. Turn OFF the ignition.
2. Disconnect the TAC module harness connector
containing the TP sensor circuits.
3. Turn ON the ignition, with the engine OFF.
4. Test the TP sensor 1 5-volt reference circuit for a
short to voltage with a DMM. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 32
Go to Step 17
17
1. Turn OFF the ignition.
2. Disconnect the accelerator pedal position (APP)
sensor harness connector.
3. Disconnect the other TAC module harness
connector.
4. Turn ON the ignition, with the engine OFF.
5. Test the APP sensor 1 5-volt reference circuit for
a short to voltage with a DMM. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
-
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L -
Hummer H2
Did you find and correct the condition?
Go to Step 32
Go to Step 22
18
Disconnect the APP sensor.
Is the voltage less than the specified value?
4.54 V
Go to Step 19
Go to Step 30
19
1. Disconnect the TAC module harness connector
containing the TP sensor circuits.
2. Test the TP sensor 1 5-volt reference 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 32
Go to Step 20
20
Test the TP sensor 1 5-volt reference circuit for a short
to ground with a DMM.
Did you find and correct the condition?
-
Go to Step 32
Go to Step 21
21
Test the APP sensor 1 5-volt reference circuit 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 32
Go to Step 22
22
Test for a short between the TP sensor 1 5-volt
reference 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 32
Go to Step 23
23
Test for a short between the APP sensor 1 5-volt
reference 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 32
Go to Step 28
24
1. Connect a fused jumper between the TP sensor 1
low reference circuit and the TP sensor 1 signal
circuit.
2. Observe the TP sensor 1 voltage parameter with
a scan tool.
Is the TP sensor 1 parameter near the specified value?
0 V
Go to Step 26
Go to Step 25
25
1. Turn OFF the ignition.
2. Disconnect the TAC module harness connector
containing the TP sensor circuits.
3. Test the TP sensor 1 low-reference 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 32
Go to Step 28
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L -
Hummer H2
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