Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 543

TEST

ACTION

APPLICABILITY

3

Ignition on, engine not running.
With the DRBIII

t, read Shift Lever DTCs.

Are there any Shift Lever DTCs present?

All

Yes

→ Refer to the Shift Lever category and perform the appropriate

symptom.

No

→ Go To 4

4

Turn the ignition off to the lock position.
Disconnect the Shift Lever harness connector.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Shift Lever harness connector.
Is the resistance 60 ohms, ± 3.0 ohms?

All

Yes

→ Replace the Shift Lever Assembly per the service information.

No

→ Repair the CAN Bus (+) or the CAN Bus (-) circuit for an open.

54

TRANSMISSION - NAG1

CAN MESSAGE FROM ECM FROM SLA —

Continued

Symptom:

CONTROL MODULE TCM IS NOT CODED

POSSIBLE CAUSES

TRANSMISSION CONTROL MODULE FLASH

TEST

ACTION

APPLICABILITY

1

View repair.

All

Repair

Flash the Transmission Control Module to the proper level.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

55

TRANSMISSION - NAG1

Symptom:

ENGINE CAN MESSAGE INCORRECT

When Monitored and Set Condition:

ENGINE CAN MESSAGE INCORRECT

When Monitored:

CAN-ID received at least once and CAN Bus Circuit DTC is not active.

Set Condition:

DTC Detected if the number of bytes incorrect for CAN ID.

POSSIBLE CAUSES

ENGINE DTCS PRESENT

ECM - ENGINE CAN MESSAGE INCORRECT

TCM - ENGINE CAN MESSAGE INCORRECT

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

Go To

2

2

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 Driveability category and perform the appropriate

symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 3

56

TRANSMISSION - NAG1

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