wheel MERCEDES-BENZ SPRINTER 2006 Service Manual

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
Ye s!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 DRBIIIt/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 DRBIIItwith a typical 5-volt square wave
pattern.
Does the scope pattern match a typical 5 volt square wave Signal Scope Pattern?All
Ye s!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
Ye s!Repair as necessary.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Test Complete.
94
TRANSMISSION - NAG1
N3 INPUT SPEED SENSOR CIRCUIT ÐContinued

Symptom:
TRANSMISSION SLIPPING
When Monitored and Set Condition:
TRANSMISSION SLIPPING
When Monitored: Engine rpm greater than 450 rpm, output speed greater than 180 rpm,
no N2 - N3 input speed sensor errors present, no gear selector lever errors present, no ABS
system errors, no transfer case errors present, and all wheel speeds between 70 - 380 rpm
with no wheel slip detected. Set Condition: Calculated ratio not within allowable range for
the engaged gear. No shifting operation.
Set Condition: The TCM constantly calculates the transmission ratio based on the N2 -
N3 input speed signals and the calculated output shaft speed (CAN message from the
ABS). The TCM will detect if the transmission is slipping or an invalid gear ratio is present
POSSIBLE CAUSES
OTHER DTCS PRESENT
AXLE - MECHANICAL - GEAR RATIO
INTERNAL TRANSMISSION
TCM - TRANSMISSION SLIPPING
TEST ACTION APPLICABILITY
1NOTE: 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 DRBIIIt, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIIIt, 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
125
TRANSMISSION - NAG1