Dodge Ram Truck 1500-2500-3500. Manual — part 459
*TRIP ODOMETER INACCURATE OR WRONG
For a complete wiring diagram Refer to Section 8W.
Possible Causes
ELECTRONIC OVERHEAD MODULE
1.
ELECTRONIC VEHICLE INFORMATION CENTER
NOTE: Diagnose and repair any FCM, PCM, or Communication DTCs before proceeding with this test.
NOTE: Ensure that the EOM has been configured for the correct fuel tank size. Use the DRBIII
T
to verify or
modify the fuel tank size configuration.
Perform the EOM Self Test.
The self test can be performed with the DRBIII
T
or manually using the following procedure:
Turn the ignition off.
Press and hold the RESET and C/T buttons.
Turn the ignition on.
Continue to hold both buttons until the software version is displayed, then release the buttons.
Observe the EOM display when the self test is complete.
Did the EOM display
(
FAILED SELF TEST
(
?
Yes
>> Replace and configure the Electronic Overhead Module in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
8M - 16
OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS
DR/DH
*CMTC OR EVIC INOPERATIVE
DR/DH
OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS
8M - 17
*CMTC OR EVIC INOPERATIVE (CONTINUED)
For the Electronic Overhead Module circuit diagram (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - SCHE-
MATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(F21) FUSED IGNITION SWITCH OUTPUT (RUN/START) CIRCUIT OPEN
(Z13) ELECTRONIC OVERHEAD MODULE GROUND CIRCUIT OPEN
ELECTRONIC OVERHEAD MODULE
1.
(F21) FUSED IGNITION RUN/START CIRCUIT OPEN
NOTE: Diagnose and repair any MIC, FCM, PCM, or Communica-
tion DTCs before proceeding.
Turn the ignition off.
Disconnect the Electronic Overhead Module harness connector.
Turn the ignition on.
Measure the voltage between the (F21) Fused Ignition Switch Output
(Run/Start) circuit and ground.
Is the voltage below 10.5 volts?
Yes
>> Repair the (F21) Fused Ignition Switch Output (Run/Start)
circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Go To 2
2.
(Z13) ELECTRONIC OVERHEAD MODULE GROUND CIRCUIT OPEN
Trun the ignition off.
Measure the resistance between ground and the (Z13) Electronic
Overhead Module Ground circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (Z13) Electronic Overhead Module Ground cir-
cuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
No
>> Replace the Electronic Overhead Module in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
8M - 18
OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS
DR/DH
*COMPASS TEST FAILURE
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Electronic Overhead Module (EOM) display reads “FAILED SELF TEST.”
Possible Causes
ELECTRONIC OVERHEAD MODULE
1.
ELECTRONIC OVERHEAD MODULE
Perform the EOM self test.
Turn the ignition off.
Depress and hold the RESET and C/T buttons while turning the ignition on.
NOTE: This test may also be performed using the DRBIII
T
.
Does the EOM or DRBIII
T
display
(
FAILED SELF TEST
(
?
Yes
>> Replace the EOM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
No
>> Test Complete.
DR/DH
OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS
8M - 19
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