Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1930
3.
(B29) BRAKE SWITCH SIGNAL OPEN
Turn the ignition off to the lock position.
Disconnect the ESM harness connector.
Disconnect the Stop Lamp Switch harness connector.
Measure the resistance of the (B29) Brake Switch Signal circuit
between the ESM harness connector and the Stop Lamp Switch har-
ness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (B29) Brake Switch Signal for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
No
>> Go To 4
4.
(B29) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (B29) Brake Switch Signal circuit.
Is the voltage above 0.5 volts?
Yes
>> Repair the (B29) Brake Switch Signal for a short to voltage.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
No
>> Using the schematics as a guide, check the Electronic Shift
Module (ESM) terminals for corrosion, damage, or terminal
push out. Pay particular attention to all power and ground
circuits. If no problems are found, replace the ESM (Steer-
ing Column) per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
21 - 254
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
LX
P2775-AUTOSTICK UPSHIFT SWITCH CIRCUIT PERFORMANCE - ESM (COLUMN
SHIFT)
LX
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 255
For a complete wiring diagramRefer to Section 8W
•
When Monitored:
When in AutoStick
T
mode.
•
Set Condition:
When the expected AutoStick
T
switch state is not correctly sensed by the Electronic Shift Module (ESM). If the
upshift switch signal is detected as active in a gear position other than drive or when both the upshift and
downshift signals are active at the same time.
Possible Causes
AUTOSTICK SWITCH
ELECTRONIC SHIFT MODULE
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Theory of Operation
The AutoStick
T
Switch is located at the end of the Shift Lever. The gear change is requested by pressing the Auto-
Stick Enable button, then either selecting the Upshift or Downshift on the rocker switch. The ESM then transmits the
previous information over the CAN C bus to the TCM to engage the requested gear.
Diagnostic Test
1.
CHECK THE AUTOSTICK SWITCH
AUTOSTICK SWITCH RESISTANCE VALUES (COLUMN SHIFT)
NON SWITCHED STATE
ENABLE
DOWNSHIFT
UPSHIFT
21.5k ohms ±1%
2.64k ohms ±1%
4.05k ohms ±1%
8.10k ohms ±1%
Turn the ignition off to the lock position.
Disconnect the AutoStick
T
harness connector.
Measure the resistance between the AutoStick Switch MUX circuit and
the AutoStick Switch MUX Return circuit while checking each switch
position.
NOTE: Use the above chart to and compare your resistive read-
ings.
Does the AutoStick Switch resistance readings match the
above chart?
Yes
>> Using the schematics as a guide, check the Electronic Shift
Module (ESM) terminals for corrosion, damage, or terminal
push out. Pay particular attention to all power and ground
circuits. If no problems are found, replace the ESM (Steer-
ing Column) per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
No
>> Replace the AutoStick Switch per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
21 - 256
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
LX
P2779-AUTOSTICK DOWNSHIFT SWITCH CIRCUIT PERFORMANCE - ESM
(COLUMN SHIFT)
LX
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 257
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст