Hummer H1 Service Manual page 1156

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DTC P0567 Cruise Resume Circuit
HOT IN RUN
AND START
HOT IN RUN
AND START
Circuit Description
The cruise Resume/Accel switch is an input to the fuel control
portion of the PCM. These inputs allow the PCM to control
and hold a requested speed. Cruise Resume/Accel switch sends
ignition voltage to the PCM when the switch is closed ("ON").
This is a type D DTC.
Conditions for Setting the DTC
• Cruise switch "OFF".
• Ignition voltage on Resume switch signal circuit.
or
• Cruise switch "ON".
• Resume switch "ON" for longer than 25.5 seconds
Action Taken When the DTC Sets
• Will not turn on the MIL.
• The PCM will disallow all cruise inputs.
• TCC shift schedules may be affected.
05745159
ACCELERATIOR
PEDAL POSITION
SENSOR
44
D B
32
C
2
53
G A
17
F
1
60
E
J
15
K
3
14
20
22
FUSE 3A
10 AMP
EXTERIOR
C5-A4
A
RESUME
ACCEL
SET
COAST
FUSE 5C
10AMP
INTERIOR B
ON/
295 BR OFF
722 PP
721 LB
719 BR
718 DB
725 GY
724 DG
723 YL
717 WH
720 TN
C1
C5-D3
B
154 TN
C
37
YL 153 LG
D
42
GRN 152 DB
A 29
RD 151 GY
C1
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
Check for a resume/accel switch stuck in the engage position
or the signal circuit is shorted to voltage.
Test Description
Number(s) below refer to the number(s) on the diagnostic ta-
ble.
2. This step determines if the signal circuit is shorted to volt-
age.
3. This step determines if the PCM or switch is at fault.
PCM/Tech 1 Scan Tool 91
POWERTRAIN
CONTROL
MODULE
(PCM)
C29-A12
GROUND
C27-C5 APP 2
SIGNAL
C29-B1
GROUND
C29-B2
APP 1
SIGNAL
C27-D6
GROUND
C27-D4
APP 3
SIGNAL
C27-D3
C27-D12
5 VOLT
REFERENCE
C28-C2
WASTEGATE
C28-D14
SOLENOID
CONTROL
C27-D10 RESUME
ACCEL
SIGNAL
SET
C29-B11
COAST
SIGNAL
C29-A11 ON / OFF
SIGNAL
9-S12-055