Power Tail
Gate(hereinafter PTG) is the system which moves tail gate of vehicle by
electronic motor so that user can open or close door with less force than
required on manual operation. To monitor system operation such as speed
and position of gate, PTG uses optical sensor. Optical sensor is located
at channel and pinion assembly and always makes a pair to distinguish
moving direction of door. Signal of optical sensor is pulse signal and
used for control of motor speed,gate position and detecting
obstacle.
The ECM sets DTC B1271
if there is short circuit in #1 optical sensor signal
harness.
Item
|
Detecting
Condition
|
Possible Cause
|
DTC
Strategy
|
-
|
| •
|
Short in signal
harness |
|
Enable
Conditions
|
| •
|
IGN "ON" & ENG "OFF" & PTG
"ON" | |
Threshold
value
|
-
|
Detecting
time
|
-
|
FAIL
SAFE
|
| •
|
Inhibit powerdoor
operation | |
※ Output voltage of
optical sensor.
| 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 B1271 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 optical sensor.
Specification :
Approx. 0 Ω
| |
| (3) |
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) |
Ignition "ON" & engine
"OFF" |
| (2) |
Disconnect "OPTICAL SENSOR"
connector. |
| (3) |
Measure resistance between sensing
terminal of "OPTICAL SENSOR" and chassis ground.
Specification : Approx. ∞ Ω
| |
| (4) |
Is the measured resistance within
specifications?
|
|
▶ Go
to "Component Inspection" procedure.
|
|
|
▶
Check for short to battery in signal harness. Repair as
necessary and go to "Verification of Vehicle Repair"
procedure.
|
| |
| 1. |
Check optical sensor
| (1) |
Ignition "ON" & engine
"OFF" |
| (2) |
Measure waveform between terminal of
optical sensor and chasis ground while operating
PTG.
Specification : Refer
Signal Waveform & Data in General
Information
| |
| (3) |
Is waveform measured near the specified
form in General information?
|
|
▶
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 drive unit and check for
proper operation. If the problem is corrected, replace
drive unit and then go to"Verification Vehicle Repair"
procedure.
※ It is impossible
to change Optical sensor separately. So it is changed by
drive unit when change is
necessary.
|
| |
| 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.
|
|
