Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 553
TEST
ACTION
APPLICABILITY
9
Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connectors.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Sensor Ground circuit.
Is the resistance Below 5.0 ohms?
All
Yes
→ Repair the Sensor Ground circuit for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 10
10
Turn the ignition off to the lock position.
With the DRBIII
t/PEP Module being used as a Dual Channel Lab Scope with Miller
Special tool #6801.
Backprobe N3 Input Speed Sensor Signal circuit using Channel 1 at the TCM
harness connector.
Raise all drive wheels off the ground.
CAUTION: Properly support vehicle
Start the engine.
Place gear selector in drive and increase vehicle speed to engage 2nd gear
CAUTION: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Compare the Scope Pattern on the DRBIII
t with a typical 5-volt square wave
pattern.
Does the scope pattern match a typical 5 volt square wave Signal Scope Pattern?
All
Yes
→ Go To 11
No
→ Replace the N3 Input Speed Sensor.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
11
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
12
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 any problems found?
All
Yes
→ Repair as necessary.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Test Complete.
94
TRANSMISSION - NAG1
N3 INPUT SPEED SENSOR CIRCUIT —
Continued
Symptom:
SENSOR SUPPLY VOLTAGE
When Monitored and Set Condition:
SENSOR SUPPLY VOLTAGE
When Monitored:
Always monitored with system active at each ignition cycle and no
under-voltage condition exists.
Set Condition:
If measured sensor voltage is not within specified limits 4.8-7.2 volts or if
a Faulty regulator, Sensor Supply Voltage shorted to ground, Sensor Supply Voltage
shorted to battery is detected.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
SENSOR SUPPLY CIRCUIT SHORT TO OTHER CIRCUIT
SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND
TCM - SENSOR SUPPLY VOLTAGE
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.
Is the DTC Sensor Supply Voltage displayed as ACTIVE?
All
Yes
→ Go To 3
No
→ Go To 5
95
TRANSMISSION - NAG1
TEST
ACTION
APPLICABILITY
3
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Supply circuit to all other circuits in the
Transmission Solenoid harness connector.
Is the resistance below 5.0 ohms between any other circuit?
All
Yes
→ Repair the Sensor Supply circuit for a short to other circuit-s.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Supply circuit to chassis ground in the
Transmission Solenoid Assembly harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Sensor Supply Voltage circuit for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ 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.
96
TRANSMISSION - NAG1
SENSOR SUPPLY VOLTAGE —
Continued
Symptom:
SHIFT LEVER POSITION INVALID
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
SHIFT LEVER DTCS PRESENT
OPEN CAN BUS CIRCUITS AT SHIFT LEVER
SHIFT LEVER ASSEMBLY
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.
No
→ Go To 3
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
97
TRANSMISSION - NAG1
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