Dodge Sprinter. Manual — part 541
TEST
ACTION
APPLICABILITY
3
Replace and program the ECM per the Service Information.
With the DRBIII
t, erase Transmission DTCs.
Start the engine.
With the brakes firmly applied, shift the gear selector into drive.
With the DRBIII
t, read Transmission DTCs.
Did the DTC, ENGINE CAN MESSAGE INCORRECT, reset?
All
Yes
→ Go To 4
No
→ Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
57
TRANSMISSION - NAG1
ENGINE CAN MESSAGE INCORRECT —
Continued
Symptom:
ENGINE CAN MESSAGE MISSING
When Monitored and Set Condition:
ENGINE CAN MESSAGE MISSING
When Monitored:
CAN Bus circuit error not present, 1 second after ignition on and not
in Park or Neutral, no System Overvoltage or System Undervoltage conditions present, or
transmission in Park or Neutral and engine RPM greater than 850 RPM.
Set Condition:
This DTC is set if a CAN ID was not received in the required time, being
sent from the Engine Controller.
POSSIBLE CAUSES
CAN BUS +/- CIRCUIT OPEN
CAN BUS CIRCUIT DTC PRESENT
ENGINE DTCS PRESENT
ECM - ENGINE CAN MESSAGE MISSING
TCM - ENGINE CAN MESSAGE MISSING
TEST
ACTION
APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIII
t, read and record all Transmission DTCs.
NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal
connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for any Technical Service Bulletins that may apply.
Perform this procedure prior to Symptom diagnosis.
All
Continue
58
TRANSMISSION - NAG1
TEST
ACTION
APPLICABILITY
2
Ignition on, engine not running.
With the DRBIII
t, read Transmission DTCs.
NOTE: If the DTC, CAN BUS CIRCUIT, is present, perform diagnostics on
that symptom first.
Is the DTC, CAN BUS CIRCUIT, present?
All
Yes
→ Refer to the Transmission category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Ignition on, engine not running.
With the DRBIII
t, read Engine DTCs.
Are there any performance or bus related Engine DTCs present?
All
Yes
→ Refer to the Powertrain category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off to the lock position.
Disconnect the ECM harness connector(s).
Disconnect the TCM C2 harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the CAN Bus + circuit between the ECM harness connector
and the TCM C2 harness connector.
Measure the resistance of the CAN Bus - circuit between the ECM harness connector
and the TCM C2 harness connector.
Is the resistance above 5.0 ohms on either circuit?
All
Yes
→ Repair the CAN BUS + or - circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Replace and program the ECM per the Service Information.
With the DRBIII
t, erase Transmission DTCs.
Start the engine.
With the brakes firmly applied, shift the gear selector into drive.
With the DRBIII
t, read Transmission DTCs.
Did the DTC, ENGINE CAN MESSAGE MISSING, reset?
All
Yes
→ Go To 6
No
→ Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
59
TRANSMISSION - NAG1
ENGINE CAN MESSAGE MISSING —
Continued
Symptom:
ENGINE OVERSPEED
When Monitored and Set Condition:
ENGINE OVERSPEED
When Monitored:
Valid Engine RPM message received at least once, the CAN Bus Circuit
and Engine CAN Message Missing are not active.
Set Condition:
If the engine speed increases above 5100 RPM.
POSSIBLE CAUSES
ENGINE - MECHANICAL PROBLEM
TRANSMISSION - MECHANICAL PROBLEM
ECM - ENGINE OVERSPEED
TCM - ENGINE OVERSPEED
TEST
ACTION
APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIII
t, read and record all Transmission DTCs.
NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal
connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for any Technical Service Bulletins that may apply.
Perform this procedure prior to Symptom diagnosis.
All
Continue
2
Determine if there are any Engine Mechanical problems present.
Are there any Engine Mechanical problems present?
All
Yes
→ Refer to the Service Information for the proper repair procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 3
60
TRANSMISSION - NAG1
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