Hummer H1 (2002+). Manual — part 294
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PCM/Tech 1 Scan Tool 109
®
05745159
DTC P1218 Injection Pump Calibration Circuit
Step
Action
Value(s)
Yes
No
1
Important
: Before clearing DTCs 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 Powertrain On-Board Diagnostic (OBD) System Check perfom-
med?
—
Go to Step 2.
Go to Power-
train OBD
System Check.
2
Are than any other DTCs set?
—
Refer to
Aplicable
DTC Table
Go to Step 3.
3
1. Check connection at Fuel Solenoid Driver.
2. Clear DTC, and cycle ignition.
3. Start and idle engine.
4. Activate Time set procedure (the diagnostic will only run when a Time
Set procedure is perfommed).
5. Exit out of Time set procedure and Select DTC, Specific, then enter the
DTC number.
Does the Scan Tool indicate that the diagnostic Passed?
—
Go to Step 5.
Go to Step 4.
4
Replace injection pump.
Important: The new injection pump must be timed. Refer to Fuel Injection
Pump
.
Is the action complete?
—
Go to Step 6.
—
5
DTC is intemmittent. If no additional DTCs are stored, refer to Diagnostic
Aids. If additional DTCs were stored refer to those table(s).
Are any additional DTC(s) stored?
—
Go to Apli-
cable DTC
Table.
Go to Diag-
nostic Aids.
6
Using the Scan Tool, select Capture Info, Review Info.
Are any DTCs displayed that have not been diagnosed?
—
Go to Apli-
cable DTC
Table.
System OK.
110
PCM/Tech 1 Scan Tool
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®
DTC P1621 EEPROM Write
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 P1627 - A/D Performance
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 111
®
05745159
DTC P1635 PCM 5 Volt Reference Low
Circuit Description
The PCM provides a 5 volt supply for use in powering up sen-
sors. This test monitors the voltage present at terminals BRD13
(shared by Boost and Crankshaft Position sensors) and BRD14
(Optical/Fuel temperature sensor (Cam/HI Res)). This is a type
B DTC.
Conditions for Setting the DTC
5 volt reference is less than 1 volt.
Action Taken When the DTC Sets
• Backup fuel.
• No EGR.
• No turbo boost.
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
During the time the failure is present, the setting of additional
DTCs that share a 5 volt reference may also set.
Test Description
Number(s) below refer to the number(s) on the diagnostic ta-
ble.
1. Checks to confirm that a DTC is still present.
2. Checks to determine if there is a 5 volt reference from the
PCM.
3. Checks to determine if there is a short-to-ground in CKT
350 or CKT 375, or a short-to-ground in the PCM.
5 VOLT
REFERNCE
CKP
SENSOR
SIGNAL
SENSOR
GROUND
CRANK
SHAFT
POSITION
SENSOR
(CKP)
A
B
B
A
B
B
A
A
C
C
C5-B12
C5-B5
C5-B9
BOOST/
BARO
PRESSURE
SENSOR
INTAKE AIR
TEMPERATURE
SENSOR (IAT)
ENGINE
COOLANT
TEMP
SENSOR
(ECT)
C5-B10
POWERTRAIN
CONTROL
MODULE
CKP
SENSOR
SIGNAL
SENSOR
GROUND
5 VOLT
REFERENCE
BOOST
SENSOR
SIGNAL
SENSOR
GROUND
ECT
SENSOR
SIGNAL
IAT
SENSOR
SIGNAL
C29-A5
359 BK
C5-C4
C5-C5
C27-C1
C27-D13
C27-C14
C29-B12
349 YL
651 PP
350 LG
394 LB
359 BK
C5-B11
TO
TFT
SENSOR
357 TN
354 YL
9-S12-066
112
PCM/Tech 1 Scan Tool
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®
DTC P1635 - PCM 5 Volt Reference Low
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. Scan tool installed.
2. Crank engine for 15 seconds or start up.
Does DTC reset?
—
Go to Step 3.
Go to Step 5.
3
1. Ignition ON, engine OFF>
2. Disconnect Boost/BARO sensor.
3. With J–39200 DVM, probe 5 volt reference circuit at harness connec-
tor.
Is voltage less than the specified value?
4.0v
Go to Step 4.
Go to Step 6.
4
1. Disconnect PCM connector with the boost sensor 5 volt reference cir-
cuit.
2. With test light connected to B+, probe 5 volt reference circuit at PCM
harness.
Is test light ON?
—
Go to Step 7.
Go to Step 8.
5
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
applicable
DTC table.
Go to
Diagnostic
Aids
6
Replace Boost/BARO sensor.
—
Go to Step 8.
—
7
Repair short to ground in 5 volt reference circuit.
Is the action complete?
—
Go to Step 8.
—
8
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 9.
Go to Step 8.
9
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 6.
Go to Step 2.
10
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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