Jeep Grand Cherokee WK. Manual — part 1298
P0562–BATTERY VOLTAGE LOW
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 Shift Lever Assembly monitors ignition voltage. The DTC will set if the monitored battery voltage drops below
6.0 volts and a temporary limp in will be activated. If the voltage rises above 9.0 volts, normal operations is
resumed.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
When monitored battery voltage drops below 6.0 volts.
Possible Causes
VEHICLE CHARGING SYSTEM
(F1) IGNITION UNLOCK RUN START CIRCUIT
(Z911) GROUND CIRCUIT
SHIFT LEVER ASSSEMBLY
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING)
Diagnostic Test
1.
CHECK FOR ENGINE CHARGING SYSTEM DTCS
With the scan tool, read Engine DTCs.
Are there any Engine Charging System DTCs present?
Yes
>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate symptom.
No
>> Go To 2
2.
CHECK (F1) IGNITION UNLOCK RUN START CIRCUIT
Turn the ignition off to the lock position.
Disconnect the Shift Lever Assembly harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F1) Ignition
Unlock Run Start circuit in the Shift Lever Assembly harness connec-
tor.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the (F1) Ignition Unlock Run Start circuit for high
resistance.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
21 - 2
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
WK
P0562–BATTERY VOLTAGE LOW (CONTINUED)
3.
CHECK (Z911) GROUND CIRCUIT
Turn the ignition off to the lock position.
Using a 12-volt test light connected to 12-volts, check the (Z911)
Ground circuit in the Shift Lever Assembly harness connector.
NOTE: The test light must illuminate brightly. Compare the bright-
ness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
>> Go To 4
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Repair the (Z911) Ground circuit for high resistance.
4.
SHIFT LEVER ASSEMBLY
Reconnect all disconnected harness connectors.
With the scan tool, erase Shift Lever DTC’s.
Start the engine and raise the engine speed to 2000 RPM.
With the scan tool, read Shift Lever DTC’s.
Did the P0562–BATTERY VOLTAGE LOW DTC reset?
Yes
>> Replace the Shift Lever Assembly per the Service Information
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
WK
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 3
P0563–BATTERY VOLTAGE HIGH
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 Shift Lever Assembly monitors ignition voltage. The DTC will set, if the monitored battery voltage rises above
16.0 volts.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
When the monitored battery voltage rises above 16.0 volts.
Possible Causes
CHARGING SYSTEM DTCS
VEHICLE WAS JUMP STARTED INCORRECTLY
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.
CHECK FOR CHARGING SYSTEM DTCS
With the scan tool, read Engine DTCs.
NOTE: This includes any one trip faults.
Are there any Engine Charging System DTCs present?
Yes
>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate symptom.
No
>> Go To 2
2.
VEHICLE WAS JUMP STARTED INCORRECTLY
Verify if the vehicle was jump started by another vehicle using a 24-volt charging system or incorrectly jump started
with the 12 volt battery in series.
Was the vehicle jump started by another vehicle?
Yes
>> This is the cause of the DTC. Erase the DTC and return the vehicle to the customer.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 3
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
WK
P0563–BATTERY VOLTAGE HIGH (CONTINUED)
3.
SHIFT LEVER ASSEMBLY
Reconnect all disconnected harness connectors.
With the scan tool, erase Shift Lever DTC’s.
Start the engine and raise the engine speed to 2000 RPM.
With the scan tool, read Shift Lever DTC’s.
Did the P0562–BATTERY VOLTAGE HIGH DTC reset?
Yes
>> Replace the Shift Lever Assembly per the Service Information
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
WK
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 5
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