Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) ENGINE DTCS PRESENT
With the scan tool, read Engine DTCs.

Are there any Engine brake DTCs present?

Yes
1. Refer to appropriate ENGINE ELECTRICAL DIAGNOSTICS article and perform the appropriate diagnostic procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
No
1. Go To step 2.
2) ABS MODULE DTCS PRESENT
With the scan tool, read ABS Module DTCs.

Are there any ABS DTCs present?

Yes
1. Refer to appropriate ABS ELECTRICAL DIAGNOSTICS article and perform the appropriate diagnostic procedure.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
No
1. Go To step 3.
3) (B29) BRAKE SWITCH SIGNAL SHORT TO GROUND

Fig 1: Measuring Resistance Between Ground & Brake Switch Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Repair the (B29) Brake Switch Signal for a short to ground.
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
No
1. Go To step 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
1. Replace the Shifter Lever Assembly per the Service Information. (Refer to TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1/SHIFT MECHANISM - REMOVAL)
2. Perform NAG1 TRANSMISSION VERIFICATION TEST .