Jeep Grand Cherokee WK. Manual — part 1299
P0607–ECU INTERNAL PERFORMANCE
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
Theory of Operation
The Shifter Lever Assembly performs various internal tests to verify proper controller operation. This DTC indicates
that there is an issue with the Shifters internal processor.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
If the Shift Lever Assembly controller detects an error with the optical sensors or internal checksum value is
not correct.
Possible Causes
SHIFTER LEVER ASSEMBLY
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
SHIFT LEVER ASSEMBLY
View repair
Repair
Using the schematics as a guide, check the Shifter Lever
Assemby Control Module terminals for corrosion, damage,
or terminal push out. Pay particular attention to all power
and ground circuits. If no problems are found, replace the
Shift Lever Assembly per the Service Information. Refer to
the 21 — AUTOMATIC TRANSMISSION NAG1 — Shift
Mechanism for the appropriate service procedures.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
21 - 6
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
WK
P0930–BTSI CONTROL CIRCUIT LOW
WK
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 7
P0930–BTSI CONTROL CIRCUIT LOW (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagramRefer to Section 8W
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 receives two brake switch signals. The first signal is a CAN C Bus message sent to the shift lever
assembly. The second signal is a hardwired brake switch signal to the shift lever assembly. The CAN C Bus mes-
sage is the primary brake switch signal and the hardwired signal serves as the backup brake switch signal.
•
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 DTC’S PRESENT
ABS DTC’S PRESENT
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
SHIFT LEVER ASSEMBLY
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
ENGINE DTC’S PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine brake DTC’s present?
Yes
>> Refer to 9 — ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
ABS MODULE DTC’S PRESENT
With the scan tool, read ABS Module DTCs.
Are there any ABS DTC’s present?
Yes
>> Refer to Section 5 - BRAKES - ABS ELECTRICAL DIAGNOSTICS and perform the appropriate diag-
nostic procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 3
21 - 8
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
WK
P0930–BTSI CONTROL CIRCUIT LOW (CONTINUED)
3.
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the Shift 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.
No
>> Go To 4
4.
SHIFT 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 Shift Lever Assembly per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
WK
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 9
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