Hummer H1 (2002+). Manual — part 292
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PCM/Tech 1 Scan Tool 101
®
05745159
DTC P1125 - Accelerator Pedal Position (APP) System
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
1. Disconnect the APP sensor electrical connector.
2. Ignition “ON”, engine “OFF”.
3. With J–39200 connected to ground, check all APP 5 volt reference cir-
cuits at APP harness.
Is voltage less than specified value?
4.8v
Go to Step 4.
Go to Step 3.
3
DTC is intermittent. If no additional DTCs are stored, refer to “Diagnostic
Aids”. If additional DTCs are stored, refer to those charts(s) first.
Are additional DTCs stored?
—
Go to the
applicable
DTC table
Go to
Diagnostic
Aids
4
1. Ignition “OFF”.
2. Disconnect the PCM and check the 5 volt reference circuit for a short to
ground.
3. If the 5 volt reference circuit is shorted to ground, repair it as necessary.
Was the 5 volt reference circuit is shorted to ground?
—
Go to Step 6.
Go to Step 5.
5
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 6.
—
6
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 7.
Go to Step 2.
7
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.
102
PCM/Tech 1 Scan Tool
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DTC P1214 Injection Pump Timing Offset
Error
Circuit Description
The PCM has the ability to determine the amount of offset
needed to bring the engine to top dead center. This is used by
the PCM to determine proper injection time.
Conditions for Setting the DTC
TDC offset greater than 2.5 degrees.
or
TDC Offset less than -2.5 degrees.
Action Taken When the DTC Sets
The MIL will illuminate on 2 test failures.
Conditions for Clearing the MIL/DTC
• •The PCM will turn the MIL off after three consecutive
trips without a fault condition.
• •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
The PCM will only run the diagnostic test when a time set pro-
cedure has been activated. It is highly unlikely that the vehicle
will be brought in with this DTC set. Refer to TDC Offset.
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PCM/Tech 1 Scan Tool 103
®
05745159
DTC P1214 - Injection Pump Timing Offset Error
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
DTC is intermittent. If no additional DTCs are stored, refer to “Diagnostic
Aids”. If additional DTCs are stored, refer to those charts(s) first.
Are additional DTCs stored?
—
Go to the
applicable
DTC table
Go to
Diagnostic
Aids
3
Are there any other DTCs set?
—
Go to the
applicable
DTC table
Go to Step 4.
4
Clear all codes and reset injection timing until “TDC Offset” is between
specified values. Refer to TDC Offset.
Is timing within specified value?
- 0.25
to
- 0.75
Go to Step 7.
Go to Step 5.
5
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 6.
—
6
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 7.
Go to Step 3.
7
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.
104
PCM/Tech 1 Scan Tool
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DTC P1216 Fuel Solenoid Response Time Too
Short
Circuit Description
The injection pump delivers fuel to individual cylinders by
opening and closing a solenoid control fuel valve. The PCM
monitors the amount of time it takes for the fuel solenoid valve
to physically close after commanded to close. Closure time out
of range is seen as a fault. This response time is measured in
milliseconds. This is a type D DTC.
Conditions for Setting the DTC
• Battery voltage greater than 10 volts and less than 16
volts.
• Engine coolant temperature greater than -1°C (34°F).
• Engine speed greater than 506 RPM.
• Requested fuel rate is greater than 0.0 mm.
• Inj. Pump Closure Time less than .75 ms.
Action Taken When the DTC Sets
Possible poor performance or no start.
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.
Diagnostic Aids
If DTC P1216 is set with any other DTCs, diagnose them first.
If the vehicle is running close to the DTC setting closure time,
vehicle should be checked during cold start ups and during hot
conditions.
Test Description
Number(s) below refer to the number(s) on the diagnostic ta-
ble.
2. This step will determine if the ground circuit is open which
causes the vehicle not to start.
3. This step will determine if the signal circuit is open or an in-
jection pump (fuel solenoid) is a fault.
FUSE 3B
20AMP
EXTERIOR
FUSE BOX
DRAIN
FILTER
HOT IN RUN
AND START
WATER IN
FUEL LIGHT
LEFT HAND
STATUS CENTER
C9-D
C3-F4
C1-45
B
A
327 YL
C
C9-J
WATER IN
FUEL
SENSOR
FUEL
HEATER
291 PK
57 BK
G2
57 BK
C
A
9-S12-056
FUSE 4B
5AMP
INTERIOR
FUSE BOX
TO
IGNITION
SWITCH
C3-N7
30 GY
FUSE 3A
20AMP
EXTERIOR
FUSE BOX
HOT IN RUN
AND START
C5-A4
239 PK
ENGINE
SHUTOFF
SOLENOID
FUEL
SOLENOID
701 DB
A
A
A
B
C
D
F
E
A
B
FUEL
SOLENOID
DRIVER
IGN
FUEL
SOLENOID
HIGH
FUEL
SOLENOID
LOW
FUEL
SOLENOID
CONTROL
CLOSURE
SIGNAL
CLOSURE
GROUND
ESO
SOLENOID
CONTROL
FUEL INJECT
CONTROL
CLOSURE
SIGNAL
CLOSURE
GROUND
712 LG
713 RD
491 BK
POWER
CONTROL
MODULE
C28-C15
C28-D3
C28-C3
C27-C13
C29-A1
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