Jeep Grand Cherokee WK. Manual — part 331
*NO RESPONSE FROM EOM (ELECTRONIC OVERHEAD MODULE)
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM EOM (ELECTRONIC OVERHEAD MODULE) (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(A114) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z915) GROUND CIRCUIT OPEN
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
ELECTRONIC OVERHEAD MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active
on the Bus network. A green check indicates that the module is active on the Bus network.
Does the scan tool display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent , pushed out, and corroded terminals.
2.
(A114) FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the Electronic Overhead Module harness connector.
Using a 12-volt test light connected to ground, check the (A114) Fused
B(+) circuit.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the (A114) Fused B(+) circuit for an open or short.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
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*NO RESPONSE FROM EOM (ELECTRONIC OVERHEAD MODULE) (CONTINUED)
3.
(Z915) GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, check the (Z915)
ground circuit.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Repair the (Z915) ground circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
4.
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
NOTE: One open circuit will not cause this condition.
Measure the voltage between the (D54) CAN B Bus (-) circuit and
ground.
Measure the voltage between the (D55) CAN B Bus (+) circuit and
ground.
Is there any voltage present on either circuit?
Yes
>> Replace the Electronic Overhead Module (EOM) in accor-
dance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
No
>> Repair the (D55) and (D54) CAN B Bus circuits for an
open. Inspect the connector for damage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
- ELECTRICAL/ELECTRONIC CONTROL MODULES -
STANDARD PROCEDURE).
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*NO RESPONSE FROM ESM (SHIFT LEVER ASSEMBLY) - NAG1/DIESEL
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8E - 173
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