Dodge Sprinter. Manual — part 547
TEST
ACTION
APPLICABILITY
2
Ignition on, engine not running.
With the DRBIII
t, erase Transmission DTCs.
Raise the vehicle on the hoist.
Start the engine.
NOTE: This condition indicates a catastrophic transmission failure.
With the DRBIII
t in Sensors, monitor the N2 and N3 Speed Sensors.
Firmly apply the brakes and place the gear selector in Drive (D).
Release the brakes and raise the engine RPM to allow the Transmission to upshift to
the 2-3 and 3-4 shift schedule.
CAUTION: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Did either the N2 or N3 Speed Sensors display a RPM above 7700?
All
Yes
→ Go To 3
No
→ Go To 5
3
Remove the Transmission Oil Pan and inspect for debris or a plugged Transmission
Oil Filter.
Is there any debris, plugged Transmission Oil Filter, or signs of an Internal
Transmission problem?
All
Yes
→ Repair Internal Transmission as necessary. Pay particular atten-
tion to the Electrohydraulic Control unit. Refer to the Service
Information for proper repair procedures.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 4
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
5
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wires while checking for shorts and open circuits.
NOTE: Check for any Technical Service Bulletins that may apply.
Were there any problems found?
All
Yes
→ Repair as necessary
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Test Complete.
81
TRANSMISSION - NAG1
INPUT SENSOR OVERSPEED —
Continued
Symptom:
INTERNAL CONTROLLER
When Monitored and Set Condition:
INTERNAL CONTROLLER
When Monitored:
Always monitored with system active at each ignition cycle
Set Condition:
This code is set whenever Transmission Control Module (TCM) senses an
internal error. If this Internal Controller DTC is set with any Solenoid DTC’s repair the
Solenoid DTC’s first, erase all DTC’s, then verify the Internal Controller DTC sets before
replacing the TCM.
POSSIBLE CAUSES
TCM - INTERNAL ERROR
TEST
ACTION
APPLICABILITY
1
If there are no possible causes remaining, view repair.
All
Repair
The Transmission Control Module is reporting internal errors and
must be replaced.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
82
TRANSMISSION - NAG1
Symptom:
INVALID CONTROL MODULE VERSION
POSSIBLE CAUSES
TRANSMISSION CONTROL MODULE
INVALID CONTROL MODULE
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
Validate if the TCM part number and flash is correct for the vehicle.
Is the TCM part number and flash correct for the vehicle?
All
Yes
→ Replace the Transmission Control Module per the Service Infor-
mation.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Flash the controller is applicable. If the controller has the wrong
part number or cannot be flashed, replace the TCM per the
Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
83
TRANSMISSION - NAG1
Symptom:
MODULATING PRESSURE SOLENOID CIRCUIT
When Monitored and Set Condition:
MODULATING PRESSURE SOLENOID CIRCUIT
When Monitored:
Always monitored with system active at each ignition cycle.
Set Condition:
If the TCM detects a short to ground or battery on the solenoid control
circuit, shorted solenoid, open solenoid, or an open or shorted solenoid control circuit driver
in the TCM.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
MOD. PRESS SOLENOID CONTROL CIRCUIT OPEN
MOD. PRESS SOLENOID CONTROL CIRCUIT SHORT TO GROUND
MOD. PRESS SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS
MOD PRESS SOLENOID
TCM - MOD. PRESS SOLENOID CIRCUIT
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
84
TRANSMISSION - NAG1
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