Dodge Sprinter. Manual — part 543
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
Symptom:
ENGINE TORQUE MESSAGE INCORRECT
When Monitored and Set Condition:
ENGINE TORQUE MESSAGE INCORRECT
When Monitored:
Valid Torque CAN messages received at least once and CAN Bus
Circuit, Engine CAN Message Missing and Engine CAN Message Incorrect are not active.
Set Condition:
Engine torque message not valid or PCM/ECM controller error.
POSSIBLE CAUSES
ENGINE DTCS PRESENT
PCM/ECM - ENGINE TORQUE MESSAGE INCORRECT
TCM - TORQUE 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
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 Powertrain category and perform the appropriate
symptom.
No
→ Go To 3
66
TRANSMISSION - NAG1
TEST
ACTION
APPLICABILITY
3
Replace and program the ECM per the Service Information.
With the DRBIII
t, erase Transmission DTCs.
Drive the vehicle performing multiple aggressive upshifts and downshifts.
With the DRBIII
t, read Transmission DTCs.
Did the DTC, ENGINE TORQUE 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.
67
TRANSMISSION - NAG1
ENGINE TORQUE MESSAGE INCORRECT —
Continued
Symptom:
ENGINE TORQUE REDUCTION
When Monitored and Set Condition:
ENGINE TORQUE REDUCTION
When Monitored:
Engine intervention active for at least 20 ms, no engine torque errors,
engine torque demand is greater than 0.
Set Condition:
Torque Reduction acknowledge bit - not set, no shift aborts, the error flag
9torque reduction acknowledge9 is not set, Engine controller not supporting torque
requests.
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
CAN C BUS +/- CIRCUIT OPEN
ENGINE DTCS PRESENT
PCM/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
68
TRANSMISSION - NAG1
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