2006 MERCEDES-BENZ SPRINTER air condition

TEST ACTION APPLICABILITY
6 Turn the ignition off to the lock position.
Disconnect the Transmission Control Module C2 harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Mod Press Solenoid Control circuit and the
Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness
connector.
Is the resistance between 4.0 and 8.0 ohms?All
Ye s!Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the Mod Press Solenoid per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
7 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
Ye s!Repair as necessary
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Test Complete.
86
TRANSMISSION - NAG1
MODULATING PRESSURE SOLENOID CIRCUIT ÐContinued

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 N2 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 N2 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.
90
TRANSMISSION - NAG1
N2 INPUT SPEED SENSOR CIRCUIT ÐContinued

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:
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
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
2 Ignition on, engine not running.
With the DRBIIIt, read Transmission DTCs.
Is the DTC Sensor Supply Voltage displayed as ACTIVE?All
Ye s!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
Ye s!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
Ye s!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
Ye s!Repair as necessary
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Test Complete.
96
TRANSMISSION - NAG1
SENSOR SUPPLY VOLTAGE ÐContinued

Symptom:
SHIFT PRESSURE SOLENOID CIRCUIT
When Monitored and Set Condition:
SHIFT PRESSURE SOLENOID CIRCUIT
When Monitored: When the solenoid is off, solenoid active with 25-75% duty cycle and/or
the solenoid supply is active
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
SHIFT PRESSURE SOLENOID CONTROL CIRCUIT OPEN
SHIFT PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO GROUND
SHIFT PRESSURE SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS
SHIFT PRESSURE SOLENOID ASSEMBLY
TCM - SHIFT PRESSURE SOLENOID CIRCUIT
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
99
TRANSMISSION - NAG1

TEST ACTION APPLICABILITY
6 Turn the ignition off to the lock position.
Disconnect the Transmission Control Module C2 harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Shift Pressure Solenoid Control circuit and the
Solenoid Supply Voltage circuit in the Transmission Control Module C2 harness
connector.
Is the resistance between 4.0 and 8.0 ohms?All
Ye s!Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the Shift Pressure Solenoid.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
7 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
Ye s!Repair as necessary
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Test Complete.
101
TRANSMISSION - NAG1
SHIFT PRESSURE SOLENOID CIRCUIT ÐContinued

Symptom:
SOLENOID SUPPLY VOLTAGE
When Monitored and Set Condition:
SOLENOID SUPPLY VOLTAGE
When Monitored: When the solenoid is active or not active and no under-voltage
condition exists.
Set Condition: If voltage is present when the output is off or the measured supply voltage
and measured battery voltage differ by 3.6 volts.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
SOLENOID SUPPLY CIRCUIT SHORT TO OTHER CIRCUIT
SOLENOID SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND
SOLENOID ASSEMBLY
TCM - SOLENOID SUPPLY VOLTAGE CIRCUIT
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
2 Ignition on, engine not running.
With the DRBIIIt, read Transmission DTCs.
Is the DTC, Solenoid Supply Voltage, displayed as ACTIVE?All
Ye s!Go To 3
No!Go To 6
103
TRANSMISSION - NAG1