Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 545
Symptom:
ENGINE RPM MESSAGE
When Monitored and Set Condition:
ENGINE RPM MESSAGE
When Monitored:
Valid TPS CAN message received at least once CAN Bus Circuit,
Engine CAN Message Missing and Engine CAN Message Incorrect are not active.
Set Condition:
Signal
9engine speed9 not valid or PCM/ECM error.
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
ENGINE DTCS PRESENT
ECM - ENGINE RPM MESSAGE
TCM - ENGINE RPM MESSAGE
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
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
62
TRANSMISSION - NAG1
TEST
ACTION
APPLICABILITY
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 Driveability 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.
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 RPM MESSAGE, reset?
All
Yes
→ Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
63
TRANSMISSION - NAG1
ENGINE RPM MESSAGE —
Continued
Symptom:
ENGINE TEMP MESSAGE
When Monitored and Set Condition:
ENGINE TEMP MESSAGE
When Monitored:
Valid Engine Temp CAN message received at least once and CAN Bus
Circuit error, Engine CAN Message Missing and Engine CAN Messages Incorrect are not
active.
Set Condition:
Engine coolant temperature signal is not valid - indicates possible coolant
temperature sensor error.
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
ENGINE DTCS PRESENT
ECM- ENGINE TEMP MESSAGE
TCM - ENGINE TEMP MESSAGE
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
64
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 Engine Temperature Sensor DTCs present?
All
Yes
→ Refer to the Driveability category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 4
4
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 TEMP MESSAGE, reset?
All
Yes
→ Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Test complete.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
65
TRANSMISSION - NAG1
ENGINE TEMP MESSAGE —
Continued
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