Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1923
P0930-BTSI CONTROL CIRCUIT LOW - ESM
For a complete wiring diagram Refer to Section 8W
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
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•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
The DTC will set if the high side driver detects a short to ground for 10 seconds.
Possible Causes
ENGINE BRAKE DTCS PRESENT
ABS DTCS PRESENT
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
SHIFTER LEVER ASSEMBLY
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Theory of Operation
The brake switch signal must be active before the shift lever can be moved out of the park position. The Shifter
Lever Assembly (SLA) Electronic Shift Module (ESM) receives two brake switch signals. The first signal is a CAN C
Bus message sent to the shifter lever assembly. The second signal is a hard wired brake switch signal to the shifter
lever assembly. The CAN C Bus message is the primary brake switch signal and the hard wired signal serves as
the backup brake switch signal.
Diagnostic Test
1.
ENGINE DTCS PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine brake DTCs present?
Yes
>> Refer to 9 - ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 2
2.
ABS MODULE DTCS PRESENT
With the scan tool, read ABS Module DTCs.
Are there any ABS DTCs present?
Yes
>> Refer to Section 5 - BRAKES - ABS ELECTRICAL DIAGNOSTICS and perform the appropriate diag-
nostic procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 3
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 227
3.
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the Shifter Lever Assembly harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the (B29) Brake Switch
Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B29) Brake Switch Signal for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- NAG1 - STANDARD PROCEDURE)
No
>> Go To 4
4.
SHIFTER LEVER ASSEMBLY
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention
to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace the Shifter Lever Assembly per the Service Information. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1/SHIFT MECHANISM - REMOVAL)
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
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P0931-BTSI CONTROL CIRCUIT HIGH - ESM
For a complete wiring diagram Refer to Section 8W
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
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