Hummer H1 Service Manual page 1113

48 PCM/Tech 1 Scan Tool
DTC P0219 Engine Overspeed Condition
DRAIN
FILTER
9-S12-056
Circuit Description
The PCM has the ability to put the vehicle in an ESO con-
trolled idle if an engine overspeed condition has been detected.
This is a type D DTC.
Conditions for Setting the DTC
5 ESO cycles with an rpm drop.
Action Taken When the DTC Sets
ESO controlled idle (the PCM will control rpm by turning the
ESO "ON" and "OFF". RPM will fluctuate from 800 to 1200
when DTC is set).
_____________________________________________________
30 GY
C9-J
C3-N7
WATER IN
FUSE 4B
FUEL LIGHT
5AMP
LEFT HAND
INTERIOR
STATUS CENTER
FUSE BOX
TO
IGNITION
C9-D
SWITCH
C3-F4
C1-45
291 PK
B A
WATER IN
FUEL
SENSOR
C
CONTROL
MODULE
G2
HOT IN RUN
HOT IN RUN
AND START
AND START
FUSE 3B FUSE 3A
20AMP 20AMP
EXTERIOR EXTERIOR
FUSE BOX FUSE BOX
C5-A4
239 PK
A
ENGINE
SHUTOFF
SOLENOID
A
C
FUEL
FUEL
SOLENOID
HEATER
DRIVER
A
C28-C15 C28-D3
POWER
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 Tool.
Diagnostic Aids
This DTC will not set if an external fuel source is causing an
overspeed condition. A DTC P1216 will set along with DTC
P0219
Test Description
Number(s) below refer to the number(s) on the diagnostic ta-
ble.
2. The injection pump is being replaced in this step.
A
FUEL
SOLENOID
B
D B F
IGN FUEL FUEL
SOLENOID SOLENOID
HIGH LOW
FUEL
CLOSURE CLOSURE
SOLENOID
SIGNAL GROUND
CONTROL
A
E C
C28-C3 C27-C13 C29-A1
CLOSURE CLOSURE
SIGNAL GROUND
®