Hummer H1 Service Manual page 1169

104 PCM/Tech 1 Scan Tool
DTC P1216 Fuel Solenoid Response Time Too
Short
C9-J
WATER IN
FUEL LIGHT
DRAIN
LEFT HAND
FILTER
STATUS CENTER
C9-D
C3-F4
C1-45
B
9-S12-056
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.
___________________________________________________
30 GY
HOT IN RUN
AND START
C3-N7
FUSE 4B FUSE 3B
5AMP 20AMP
INTERIOR EXTERIOR
FUSE BOX FUSE BOX
TO
IGNITION
SWITCH
291 PK
A
C
WATER IN
FUEL
SENSOR
C
A
POWER
CONTROL
MODULE
G2
HOT IN RUN
AND START
FUSE 3A
20AMP
EXTERIOR
FUSE BOX
C5-A4
239 PK
A
ENGINE
SHUTOFF
SOLENOID
A
FUEL
FUEL
SOLENOID
HEATER
DRIVER
C28-C15 C28-D3
ESO
FUEL INJECT
SOLENOID
CONTROL
CONTROL
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.
FUEL
SOLENOID
D B
IGN FUEL FUEL
SOLENOID SOLENOID
HIGH LOW
FUEL
CLOSURE CLOSURE
SOLENOID
SIGNAL GROUND
CONTROL
A
E
C28-C3 C27-C13
CLOSURE CLOSURE
SIGNAL GROUND
®
A
B
F
C
C29-A1