2006 MERCEDES-BENZ SPRINTER lock

TEST ACTION APPLICABILITY
10 Turn the ignition off to the lock position.
Disconnect the ECM harness connector.
Measure the resistance between the CAN C Bus (+) and CAN C Bus (-) circuits in the
ECM harness connector.
Is the resistance 120.0 ohms   5.0 ohms?All
Ye s!Replace the ECM per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 11
11 Turn the ignition off to the lock position.
Reconnect the ECM harness connectors.
Disconnect the SKREEM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the SKREEM harness connector.
Is the resistance 120.0 ohms   5.0 ohms?All
Ye s!Replace the Sentry Key Remote Entry Module per the Service
Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+) and/or CAN C Bus (-) circuit for an
open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
12 Turn the ignition off to the lock position.
Disconnect the negative battery cable.
Disconnect the TCM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit at the TCM harness connector.
Is the resistance 60.0 ohms   5.0 ohms?All
Ye s!Replace the Transmission Control Module per the Service Infor-
mation.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+) and/or CAN C Bus (-) circuit for an
open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
52
TRANSMISSION - NAG1
CAN BUS CIRCUIT ÐContinued

TEST ACTION APPLICABILITY
3 Ignition on, engine not running.
With the DRBIIIt, read Shift Lever DTCs.
Are there any Shift Lever DTCs present?All
Ye s!Refer to the Shift Lever category and perform the appropriate
symptom.
No!Go To 4
4 Turn the ignition off to the lock position.
Disconnect the Shift Lever harness connector.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Shift Lever harness connector.
Is the resistance 60 ohms,   3.0 ohms?All
Ye s!Replace the Shift Lever Assembly per the service information.
No!Repair the CAN Bus (+) or the CAN Bus (-) circuit for an open.
54
TRANSMISSION - NAG1
CAN MESSAGE FROM ECM FROM SLA ÐContinued

TEST ACTION APPLICABILITY
2 Ignition on, engine not running.
With the DRBIIIt, 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
Ye s!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 DRBIIIt, read Engine DTCs.
Are there any performance or bus related Engine DTCs present?All
Ye s!Refer to the Powertrain category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 4
4 Turn the ignition off to the lock position.
Disconnect the ECM harness connector(s).
Disconnect the TCM C2 harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the CAN Bus + circuit between the ECM harness connector
and the TCM C2 harness connector.
Measure the resistance of the CAN Bus - circuit between the ECM harness connector
and the TCM C2 harness connector.
Is the resistance above 5.0 ohms on either circuit?All
Ye s!Repair the CAN BUS + or - circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 5
5 Replace and program the ECM per the Service Information.
With the DRBIIIt, erase Transmission DTCs.
Start the engine.
With the brakes firmly applied, shift the gear selector into drive.
With the DRBIIIt, read Transmission DTCs.
Did the DTC, ENGINE CAN MESSAGE MISSING, reset?All
Ye s!Go To 6
No!Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
6 If there are no possible causes remaining, view repair. All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
59
TRANSMISSION - NAG1
ENGINE CAN MESSAGE MISSING ÐContinued

TEST ACTION APPLICABILITY
3 Determine if there are any Transmission Mechanical problems present.
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
Ye s!Refer to the Service Information for the proper repair procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 4
4NOTE: The Engine and Transmission must not have mechanical problems
and be operating normally before proceeding with this test.
Turn the ignition off to the lock position.
Replace and program the PCM/ECM Control Module per the Service Information.
With the DRBIIIt, erase Transmission DTCs.
Road test the Vehicle.
With the DRBIIIt, read Transmission DTCs.
Does the DTC, ENGINE OVERSPEED, reset?All
Ye s!Go To 5
No!Replacing the ECM has corrected the problem. Perform the
Powertrain Verification test.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
5 If there are no possible causes remaining, view repair. All
Repair
Replace the TCM.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
61
TRANSMISSION - NAG1
ENGINE OVERSPEED ÐContinued

TEST ACTION APPLICABILITY
3 Ignition on, engine not running.
With the DRBIIIt, read Engine DTCs.
Are there any performance or bus related Engine DTCs present?All
Ye s!Refer to the Driveability category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 4
4 Turn the ignition off to the lock position.
Replace and program the ECM per the Service Information.
With the DRBIIIt, erase Transmission DTCs.
Start the engine.
With the brakes firmly applied, shift the gear selector into drive.
With the DRBIIIt, read Transmission DTCs.
Did the DTC, ENGINE RPM MESSAGE, reset?All
Ye s!Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
63
TRANSMISSION - NAG1
ENGINE RPM MESSAGE ÐContinued

TEST ACTION APPLICABILITY
2 Ignition on, engine not running.
With the DRBIIIt, 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
Ye s!Refer to the Transmission category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off to the lock position.
Disconnect the PCM/ECM harness connector(s).
Disconnect the TCM C2 harness connector.
Measure the resistance of the CAN C Bus + circuit between the PCM/ECM harness
connector and the TCM C2 harness connector.
Measure the resistance of the CAN C Bus - circuit between the PCM/ECM harness
connector and the TCM C2 harness connector.
Is the CAN C Bus + or - circuit open?All
Ye s!Repair the CAN C BUS + or - circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 4
4 Ignition on, engine not running.
With the DRBIIIt, read Engine DTCs.
Are there any performance or bus related Engine DTCs present?All
Ye s!Refer to the Powertrain category and perform the appropriate
symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 5
5 Replace and program the PCM/ECM per the Service Information.
With the DRBIIIt, erase Transmission DTCs.
Start the engine.
With the brakes firmly applied, shift the gear selector into drive.
With the DRBIIIt, read Transmission DTCs.
Did the DTC, ENGINE CAN MESSAGE MISSING, reset?All
Ye s!Go To 6
No!Test Complete
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
6 If there are no possible causes remaining, view repair. All
Repair
Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
69
TRANSMISSION - NAG1
ENGINE TORQUE REDUCTION ÐContinued

TEST ACTION APPLICABILITY
3 Ignition on, engine not running.
With the DRBIIIt, read Instrument Cluster DTCs.
Are there any Instrument Cluster DTCs present?All
Ye s!Refer to the INSTRUMENT CLUSTER category and perform the
appropriate symptom.
No!Go To 4
4 Turn the ignition off to the lock position.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Instrument Cluster harness connector.
Is the resistance 60 ohms,   3.0 ohms?All
Ye s!Replace the Instrument Cluster per the service information.
No!Repair the CAN C Bus (+) or the CAN C Bus (-) circuit for an open.
71
TRANSMISSION - NAG1
IC CAN MESSAGE INCORRECT ÐContinued

TEST ACTION APPLICABILITY
4 Ignition on, engine not running.
With the DRBIIIt, read Automatic Temp Control DTCs.
Are there any ATC DTCs present?All
Ye s!Refer to the Heating and A/C category and perform the appropri-
ate symptom.
No!Go To 5
5 Turn the ignition off to the lock position.
Disconnect the ATC harness connector.
Measure the resistance between the CAN Bus (+) circuit and the CAN Bus (-) circuit
in the ATC harness connector.
Is the resistance 60 ohms,   3.0 ohms?All
Ye s!Replace the Automatic Temp Control per the service information.
No!Repair the CAN C Bus (+) or the CAN C Bus (-) circuit for an open.
6NOTE: If vehicle is equipped with Air Conditioning diagnose the ATC
system first.
Ignition on, engine not running.
With the DRBIIIt, read Instrument Cluster or Automatic Temp Control DTCs.
Are there any Instrument Cluster DTCs present?All
Ye s!Refer to the INSTRUMENT CLUSTER category and perform the
appropriate symptom.
No!Go To 7
7 Turn the ignition off to the lock position.
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance between the CAN Bus (+) circuit and the CAN Bus (-) circuit
in the Instrument Cluster harness connector.
Is the resistance 60 ohms,   3.0 ohms?All
Ye s!Replace the Instrument Cluster per the service information.
No!Repair the CAN C Bus (+) or the CAN C Bus (-) circuit for an open.
73
TRANSMISSION - NAG1
IC/ATC CAN MESSAGE MISSING ÐContinued