Power
Tailgate(hereinafter PTG) is the system which moves tailgate of vehicle by
electronic motor so that user can open or close door with less force than
required on manual operation. Latch assembly is adapted to control
open/close tailgate, Latch assembly consists of latch motor and cinch
motor and is located at tailgate. PTG ECU monitors position of
forkbolt/detent switch and operates latch/cinch motor if
necessary.
The ECM sets DTC B1585
if latch is in invalid position.
Item
|
Detecting
Condition
|
Possible Cause
|
DTC
Strategy
|
| •
|
Check combination of switch
signal | |
| •
|
short to battery/ground in signal
harness |
|
Enable
Conditions
|
| •
|
IGN "ON" & ENG "OFF" & PTG
"ON" | |
Threshold
value
|
-
|
Detecting
time
|
-
|
FAIL
SAFE
|
| •
|
Inhibit close action, Inhibit latch
assembly
operation | |
| 1. |
Connect scantool to Data Link
Connector(DLC). |
| 2. |
Ignition "ON" & engine "OFF" & PTG
"ON" |
| 3. |
Selet "Diagnostic Trouble Codes(DTCs)"mode and
monitor "DTC Status" parameter.
|
| 4. |
Is the DTC B1585 present?
|
|
▶ Go to
"Inspection & Repair" procedure.
|
|
|
▶ Fault is
intermittent caused by poor contact in the sensor's and/or
ECM's connector or was repaired and ECM memory was not
cleared. Thoroughly check connectors for looseness, poor
connection, bending, corrosion, contamination, deterioration,
or damage. Repair or replace as necessary and then go to
"Verification of Vehicle Repair"
procedure.
|
|
| Terminal And Connector
Inspection |
| 1. |
Many malfunctions in the electrical system are
caused by poor harness and terminals.
Faults can also be caused by interference from
other electrical systems, and mechanical or chemical
damage. |
| 2. |
Thoroughly check connectors for looseness,
poor connection, bending, corrosion, contamination, deterioration,
or damage. |
| 3. |
Has a problem been found?
|
|
▶ Repair as
necessary and go to "Verification Vehicle Repair"
procedure.
|
|
|
▶ Go to
"W/Harness Inspection"
procedure.
|
|
| Signal Circuit
Inspection |
| 1. |
Check for open in harness
| (1) |
Ignition "ON" & engine
"OFF". |
| (2) |
Measure resistance between terminal of
PTG and terminal of Latch
switch |
| (3) |
Measure resistance between terminal of
PTG and terminal of Latch
switch |
| (4) |
Measure resistance between terminal of
PTG and terminal of Latch switch
Specification :
Approx. 0 Ω
| |
| (5) |
Is the measured resistance within
specifications?
|
|
▶ Go
to "Check for short in harness"
procedure.
|
|
|
▶
Check for open in signal harness. Repair as necessary
and go to "Verification of Vehicle Repair"
procedure.
|
| |
| 2. |
Check for short in harness
| (1) |
Check for short to battery in
harness
| A. |
Ignition "ON" & engine
"OFF" |
| B. |
Disconnect "LATCH & CINCH #1"
connector. |
| C. |
Measure resistance between Primary
signal terminal of "PTG module" and terminal Chassis
ground. |
| D. |
Measure resistance between "2ND"
signal terminal of "PTG module" and terminal Chassis
ground. |
| E. |
Measure resistance between
"DETENT" signal terminal of "PTG module" and terminal
Chassis ground.
Specification :
Approx. ∞ Ω
| |
| F. |
Is the measured resistance within
specifications?
|
|
▶ Go to "Check for short to ground"
procedure.
|
|
|
▶ Check for short to battery in signal
harness. Repair as necessary and go to
"Verification of Vehicle Repair"
procedure.
|
| |
| (2) |
Check for short to ground
| A. |
Ignition "OFF" & engine
"OFF" |
| B. |
Measure resistance between ground
terminal of "LATCH & CINCH #1" and chassis
ground.
Specification :
Approx. ∞ Ω
| |
| C. |
Is the measured resistance within
specifications?
|
|
▶ Go to "Component Inspection"
procedure.
|
|
|
▶ Check for short to ground in signal
harness. Repair as necessary and go to
"Verification of Vehicle Repair"
procedure.
|
| | |
| 1. |
Check fork volt/detent switch
| (1) |
Ignition "ON" & "OFF" & PTG
"ON". |
| (2) |
Monitor 'Detent Switch','Forkbolt
Primary Switch','Forkbolt Secondary Switch'parameter on the
scantool while operating PTG.
Specification : Refer
specification in Fig3
|
Mode
|
Switch/motor
|
Primary
|
Before/P
|
Secondary
|
Before/S
|
Unlatch
|
Open
|
1st
|
HIGH
|
HIGH→LOW
|
LOW
|
LOW
|
LOW
|
2nd
|
HIGH
|
HIGH
|
HIGH
|
HIGH
|
LOW
|
Detent
|
LOW→HIGH
|
HIGH
|
HIGH
|
HIGH
|
HIGH
|
latch motor
|
HIGH→LOW
|
LOW(FW)
|
LOW(FW)
|
LOW(FW)
|
HIGH
|
Mode
|
Switch/motor
|
Primary
|
Before/P
|
Secondary
|
Before/S
|
Unlatch
|
Close
|
1st
|
LOW
|
LOW
|
LOW
|
LOW→HIGH
|
HIGH
|
2nd
|
LOW
|
HIGH
|
HIGH
|
HIGH
|
HIGH
|
Detent
|
HIGH
|
HIGH
|
LOW
|
HIGH
|
LOW
|
latch motor
|
HIGH
|
HIGH
|
LOW(FW)
|
LOW(FW)
|
LOW→ HIGH
|
※ Output of 1st, 2nd forkvolt/detent
switch and operation of latch/cinch motor as a function of
gate position. |
| (3) |
Is the measured current data within
specifications?
|
|
▶
Check connectors for looseness, poor connection,
bending, corrosion, contamination, deterioration, or
damage. Repair or replace as necessary and then go to
"Verification of Vehicle Repair"
procedure.
|
|
|
▶
Substitute with a known-good Latch assembly and check
for proper operation.
If the
problem is corrected, replace latch assembly and then go
to "Verification of Vehicle Repair"
procedure.
|
| |
| Verification Of Vehicle
Repair |
After a repair, it is
essential to verify that the fault has been corrected.
| 1. |
Connect scantool and selet "Diagnostic Trouble
Codes(DTCs)" mode and then clear
DTC. |
| 2. |
Operate the vehicle and monitor the DTC on the
scantool. |
| 3. |
Are any DTCs present ?
|
|
▶ Go to the
applicable troubleshooting procedure.
|
|
|
▶ System is
performing to specification at this
time.
|
|
