Jeep Grand Cherokee WK. Manual — part 193

U1004-CAN C BUS TRANSMIT PERFORMANCE (CONTINUED)

7.

CHECK THE (D51) SENSOR CLUSTER LOW DATALINK CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Sensor Cluster harness connector.

Using a 12-volt test light connected to 12-volts, check the (D51) Sen-
sor Cluster Low Datalink circuit.

Does the test light illuminate brightly?

Yes

>> Repair the (D51) Cluster Sensor Low Datalink circuit for a

short to ground.

Perform ABS VERIFICATION TEST - VER 1.

No

>> Go To 8

8.

CHECK THE (D51) SENSOR LOW DATALINK CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Disconnect the Sensor Cluster harness connector.

Turn the ignition on.

Connect a jumper wire between the (D51) Sensor Cluster Low
Datalink circuit and ground.

Using a 12-volt test light connected to 12-volts, check the (D51) Sen-
sor Cluster Low Datalink circuit.

Does the test light illuminate brightly?

Yes

>> Replace the Sensor Cluster in accordance with the Ser-

vice Information.

Perform ABS VERIFICATION TEST - VER 1.

No

>> Repair the (D51) Sensor Cluster Low Datalink circuit for

an open.

Perform ABS VERIFICATION TEST - VER 1.

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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS

WK

U140E-IMPLAUSIBLE VEHICLE CONFIGURATION DATA RECEIVED

WK

BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS

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U140E-IMPLAUSIBLE VEHICLE CONFIGURATION DATA RECEIVED (CONTINUED)

For the Anti-Lock Brake System circuit diagram. (Refer to 5 - BRAKES - SCHEMATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W

•

When Monitored:
Continuously with the ignition on.

•

Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN messages from the Engine Control Module
(ECM).

Possible Causes

FCM CAN BUS DTCS

ENGINE DTCS

ANTI-LOCK BRAKE MODULE

Diagnostic Test

1.

CHECK IF FCM CAN BUS DTC’S ARE PRESENT

With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTC’s present?

Yes

>> Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diag-

nose the appropriate symptom.

Perform ABS VERIFICATION TEST - VER 1.

No

>> Go To 2

2.

CHECK IF ENGINE DTC’S ARE PRESENT

With the scan tool, read Engine DTCs.

Are there any Engine DTC’s present?

Yes

>> Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.

Perform ABS VERIFICATION TEST - VER 1.

No

>> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for

corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no
problems are found, replace the Anti-Lock Brake Module per the Service Information.

Perform ABS VERIFICATION TEST - VER 1.

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BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS

WK

U1501-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM PCM

WK

BRAKES - BRAKE CONTROLLER ELECTRICAL DIAGNOSTICS

5 - 401