Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 89
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the negative battery cable.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are connected to the CAN Bus.
Disconnect all of the modules that are connected to the CAN Bus.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit at any disconnected module’s harness connector.
Is the resistance below 10k ohms?
All
Yes
→ Repair the CAN C Bus (+) circuit for a short to the CAN C Bus (-)
circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Reconnect the Engine Control Module harness connectors.
While back probing, measure the resistance of the CAN C Bus (+) circuit and the
CAN C Bus (-) circuit at the ECM harness connector.
Is the resistance 120.0 ± 2.0 ohms?
All
Yes
→ Replace the Sentry Key Remote Entry Module in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Engine Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
51
BRAKES (CAB)
NO COMMUNICATION WITH BUS —
Continued
Symptom:
NO COMMUNICATION WITH ECM
When Monitored and Set Condition:
NO COMMUNICATION WITH ECM
When Monitored:
Ignition On - Continuously
Set Condition:
When the CAB fails to receive all messages from the ECM.
POSSIBLE CAUSES
NO COMMUNICATION WITH BUS
ENGINE CONTROL MODULE DTC(S) PRESENT
ENGINE CONTROL MODULE’S POWER/GROUND CIRCUIT(S) SHORTED OR OPEN
CAN C BUS (+)/CAN C BUS (-) CIRCUIT(S) OPEN TO ENGINE CONTROL MODULE
CAN C BUS (+)/CAN C BUS (-) CIRCUIT(S) OPEN TO CAB
ANTI-LOCK BRAKE CONTROLLER
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read CAB DTCs.
Does the DRBIII
t display: NO COMMUNICATION WITH BUS?
All
Yes
→ Refer to the symptom list for the appropriate diagnostic proce-
dure.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, read ECM DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to Powertrain Diagnostic information for the related symp-
tom(s).
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, check the TCM, IC, and ATC module for the same or similar No
Communication with Engine Control Module DTC.
Does the DRBIII
t display same or similar DTC in TCM, IC, & ATC module?
All
Yes
→ Go To 4
No
→ Go To 6
52
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Check all of the ECM’s power circuits for a short or open condition.
Check all of the ECM’s ground circuits for an open condition.
Were any problems found?
All
Yes
→ Repair the power/ground circuit(s) as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the ECM harness connector.
Is the resistance 57 to 63 ohms?
All
Yes
→ Replace the Engine Control Module in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Repair the CAN C Bus (+)/CAN C Bus (-) circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the CAB harness connector.
Is the resistance 57 to 63 ohms?
All
Yes
→ Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Repair the CAN C Bus (+)/CAN C Bus (-) circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
53
BRAKES (CAB)
NO COMMUNICATION WITH ECM —
Continued
Symptom:
NO COMMUNICATION WITH IC
When Monitored and Set Condition:
NO COMMUNICATION WITH IC
When Monitored:
Ignition On - Continuously
Set Condition:
When the CAB fails to receive all messages from the IC.
POSSIBLE CAUSES
NO COMMUNICATION WITH BUS DTC PRESENT
INSTRUMENT CLUSTER DTC(S) PRESENT
INSTRUMENT CLUSTER’S POWER/GROUND CIRCUIT(S) SHORTED OR OPEN
CAN C BUS (+)/CAN C BUS (-) CIRCUIT(S) OPEN TO INSTRUMENT CLUSTER
CAN C BUS (+)/CAN C BUS (-) CIRCUIT(S) OPEN TO CAB
INSTRUMENT CLUSTER
ANTI-LOCK BRAKE CONTROLLER
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read CAB DTCs.
Does the DRBIII
t display: NO COMMUNICATION WITH BUS?
All
Yes
→ Refer to the symptom list for the appropriate diagnostic proce-
dure.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition on.
With the DRBIII
t, read IC DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to Instrument Cluster category for the related symptom(s).
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, check the TCM and ATC module for the same or similar No
Communication with IC DTC.
Does the DRBIII
t display same or similar DTC in TCM & ATC module?
All
Yes
→ Go To 4
No
→ Go To 6
54
BRAKES (CAB)
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