Hummer H1 (2002+). Manual — part 291
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PCM/Tech 1 Scan Tool 97
®
05745159
16
Replace the faulty PCM. Notice: If the PCM is faulty, the new PCM must be
programmed. Go to PCM replacement and programming procedures.
Is the action complete?
—
Go to Step 17.
—
17
1. Using the Scan Tool, select “DTC”, “Clear Info”.
2. Start engine and idle at normal operating temperature.
3. Select “DTC”, “Specific”, then enter the DTC number which was set.
4. Operate vehicle within the conditions for setting this DTC as specified in the
supporting text.
Does the Scan Tool indicate that this diagnostic Ran and Passed?
—
Go to Step 18.
Go to Step 2.
18
Using the Scan Tool, select “Capture Info”, “Review Info”.
Are any DTCs displayed that have not been diagnosed?
—
Go to the
applicable
DTC table
System OK.
DTC P0571 - Cruise Brake Switch Circuit
Step
Action
Value(s)
Yes
No
98
PCM/Tech 1 Scan Tool
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DTC P0601 - PCM Memory Check
Step
Action
Value(s)
Yes
No
1
Important:
Before clearing DTC(s) use the scan tool “Capture Info” to
record freeze frame and failure records for reference, as data will be lost
when “Clear Info” function is used.
Was the “On-Board Diagnostic (OBD) System Check” performed?
—
Go to Step 2.
Go to OBD
System Check.
2
Replace the faulty PCM. Notice: If the PCM is faulty, the new PCM must
be programmed. Go to PCM replacement and programming procedures.
Is the action complete?
—
Go to Step 3.
—
3
1. Using the Scan Tool, select “DTC”, “Clear Info”.
2. Start engine and idle at normal operating temperature.
3. Select “DTC”, “Specific”, then enter the DTC number which was set.
4. Operate vehicle within the conditions for setting this DTC as specified in
the supporting text.
Does the Scan Tool indicate that this diagnostic Ran and Passed?
—
Go to Step 4.
Go to Step 2.
4
Using the Scan Tool, select “Capture Info”, “Review Info”.
Are any DTCs displayed that have not been diagnosed?
—
Go to the
applicable
DTC table
System OK.
DTC P0602 - PCM Programming
Step
Action
Value(s)
Yes
No
1
Important:
Before clearing DTC(s) use the scan tool “Capture Info” to
record freeze frame and failure records for reference, as data will be lost
when “Clear Info” function is used.
Was the “On-Board Diagnostic (OBD) System Check” performed?
—
Go to Step 2.
Go to OBD
System Check.
2
Replace the faulty PCM. Notice: If the PCM is faulty, the new PCM must
be programmed. Go to PCM replacement and programming procedures.
Is the action complete?
—
Go to Step 3.
—
3
1. Using the Scan Tool, select “DTC”, “Clear Info”.
2. Start engine and idle at normal operating temperature.
3. Select “DTC”, “Specific”, then enter the DTC number which was set.
4. Operate vehicle within the conditions for setting this DTC as specified in
the supporting text.
Does the Scan Tool indicate that this diagnostic Ran and Passed?
—
Go to Step 4.
Go to Step 2.
4
Using the Scan Tool, select “Capture Info”, “Review Info”.
Are any DTCs displayed that have not been diagnosed?
—
Go to the
applicable
DTC table
System OK.
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PCM/Tech 1 Scan Tool 99
®
05745159
DTC P0606 - PCM Internal Communication Interrupted
Step
Action
Value(s)
Yes
No
1
Important:
Before clearing DTC(s) use the scan tool “Capture Info” to
record freeze frame and failure records for reference, as data will be lost
when “Clear Info” function is used.
Was the “On-Board Diagnostic (OBD) System Check” performed?
—
Go to Step 2.
Go to OBD
System Check.
2
Is DTC P0370 set?
—
Refer to the
applicable
DTC table
Go to Step 3.
3
Replace the faulty PCM. Notice: If the PCM is faulty, the new PCM must
be programmed. Go to PCM replacement and programming procedures.
Is the action complete?
—
Go to Step 4.
—
4
1. Using the Scan Tool, select “DTC”, “Clear Info”.
2. Start engine and idle at normal operating temperature.
3. Select “DTC”, “Specific”, then enter the DTC number which was set.
4. Operate vehicle within the conditions for setting this DTC as specified in
the supporting text.
Does the Scan Tool indicate that this diagnostic Ran and Passed?
—
Go to Step 5.
Go to Step 2.
5
Using the Scan Tool, select “Capture Info”, “Review Info”.
Are any DTCs displayed that have not been diagnosed?
—
Go to the
applicable
DTC table
System OK.
100
PCM/Tech 1 Scan Tool
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®
DTC P1125 Accelerator Pedal Position (APP)
System
Circuit Description
The Accelerator Pedal Position (APP) module provides a volt-
age signal that changes relative to accelerator position. There
are three sensors located within the APP module that are scaled
differently. This is a type C DTC.
Conditions for Setting the DTC
PCM has recognized an intermittent APP fault and there are no
current APP faults stored.
Action Taken When the DTC Sets
Vehicle will operate at limited power.
Conditions for Clearing the MIL/DTC
• A History DTC will clear when forty consecutive
warm-up cycles that the diagnostic does not fail (coolant
temperature has risen 5°C (40°F) from start up coolant
temperature and engine coolant temperature exceeds
71°C (160°F) that same ignition cycle).
• Use of a Scan Tool.
Diagnostic Aids
A DTC P1125 will set along with multiple APP DTCs. All
other DTCs should be diagnosed first.
Test Description
Number(s) below refer to the number(s) on the diagnostic ta-
ble.
1.
This step determines if DTC P1125 is a hard failure or an
intermittent condition.
FUSE 5C
10AMP
INTERIOR
FUSE 3A
10 AMP
EXTERIOR
ON/
OFF
SET
COAST
RESUME
ACCEL
HOT IN RUN
AND START
HOT IN RUN
AND START
A
29
42
37
C1
C29-A11
C29-B11
C27-D10
C28-D14
C28-C2
C27-D12
C27-D3
C27-D4
C27-D6
C29-B2
C29-B1
C27-C5
C29-A12
C5-D3
C5-A4
A
B
154 TN
151 GY
152 DB
153 LG
ON / OFF
SIGNAL
SET
COAST
SIGNAL
RESUME
ACCEL
SIGNAL
WASTEGATE
SOLENOID
CONTROL
5 VOLT
REFERENCE
APP 3
SIGNAL
GROUND
APP 1
SIGNAL
GROUND
GROUND
D
B
C
A
G
E
F
J
K
3
1
2
C1
22
20
14
15
60
32
53
17
44
720 TN
717 WH
723 YL
724 DG
725 GY
718 DB
719 BR
721 LB
722 PP
ACCELERATIOR
PEDAL POSITION
SENSOR
POWERTRAIN
CONTROL
MODULE
(PCM)
APP 2
SIGNAL
9-S12-055
B
C
D
295 BR
YL
GRN
RD
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