Dodge Nitro. Manual — part 346

Yes

Refer to ABS ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic procedure.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

No

Go to 3).

3) (L51) BRAKE SWITCH SIGNAL SHORT TO GROUND

Fig. 3: Measuring Resistance Between Ground And (L51) Brake Switch Signal Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off to the lock position.

Disconnect the Shift Lever Assembly harness connector.

Measure the resistance between ground and the (L51) Brake Switch Signal circuit.

Is the resistance below 5.0 ohms?

NOTE:

Check connectors - Clean/repair as necessary.

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Shifter Diagnostics - Nitro

Yes

Repair the (L51) Brake Switch Signal for a short to ground.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

No

Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay
particular attention to all power and ground circuits. If no problems are found, replace the Shift
Lever Assembly per the Service Information.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

P0931-BTSI CONTROL CIRCUIT HIGH - ESM

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

Continuously with the ignition in the run position.

Set Condition:

The DTC will set if the high side driver detects an open load for 10 seconds.

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding.

The brake switch signal must be active before the shift lever can be moved out of the park position. The Shift
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. These two brake switch signals are compared against each other
to verify proper brake switch operation.

Diagnostic Test

1) ENGINE DTCs PRESENT

With the scan tool, read Engine DTCs.

Possible Causes

ENGINE BRAKE DTC'S PRESENT
ABS DTC'S PRESENT
(L51) BRAKE SWITCH SIGNAL OPEN
(L51) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE
SHIFT LEVER ASSEMBLY

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Shifter Diagnostics - Nitro

Are there any Engine brake DTCs present?

Yes

Refer to appropriate Engine Electrical Diagnostics article and perform the appropriate diagnostic
procedure.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

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 ABS - ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic
procedure.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

No

Go to 3).

3) (L51) BRAKE SWITCH SIGNAL OPEN

Fig. 4: Measuring Resistance Of (L51) Brake Switch Signal Circuit Between Shift Lever Assembly
Harness Connector And Stop Lamp Switch
Courtesy of CHRYSLER LLC

Turn the ignition off to the lock position.

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Shifter Diagnostics - Nitro

Disconnect the Shift Lever Assembly harness connector.

Disconnect the Stop Lamp Switch harness connector.

Measure the resistance of the (L51) Brake Switch Signal circuit between the Shift Lever Assembly
harness connector and the Stop Lamp Switch.

Is the resistance above 5.0 ohms?

Yes

Repair the (L51) Brake Switch Signal for an open.

Perform NAG1 TRANSMISSION VERIFICATION TEST.

No

Go to 4).

4) (L51) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE

Fig. 5: Measuring Voltage Of (L51) Brake Switch Signal Circuit

NOTE:

Check connectors - Clean/repair as necessary.

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Shifter Diagnostics - Nitro