2006 MERCEDES-BENZ SPRINTER ignition

TEST ACTION APPLICABILITY
2 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 With the DRBIIIt, read Transmission DTCs.
Is the DTC Accel Pedal Sensor CAN Message Incorrect displayed as ACTIVE?All
Ye s!Go To 4
No!Go To 8
4 Ignition on, engine not running.
With the DRBIIIt, read Engine DTCs.
Are there any Engine bus related DTCs present?All
Ye s!Refer to the Communication category and perform the appropri-
ate symptom.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 5
5 Ignition on, engine not running.
With the DRBIIIt, read Engine DTCs.
Are there any Accel Pedal 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 6
6 Replace the Transmission Control Module.
NOTE: Perform the transmission verification test.
Did the DTC9Accel Pedal Sensor CAN Message Incorrect9reset?All
Ye s!Go To 7
No!Test Complete.
7 If there are no possible causes remaining, view repair. All
Repair
Replace the Engine Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
8 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.
47
TRANSMISSION - NAG1
ACCEL PEDAL SENSOR CAN MESSAGE INCORRECT ÐContinued

Symptom:
CAN BUS CIRCUIT
When Monitored and Set Condition:
CAN BUS CIRCUIT
When Monitored: Always monitored with system active at each ignition cycle.
Set Condition: Open circuit in the CAN C Bus (+) circuit or CAN C Bus (-) circuit, Short
to ground of CAN C Bus (+) circuit or CAN C Bus (-) circuit, Short to Voltage of CAN C Bus
(+) circuit or CAN C Bus (-) circuit, CAN C Bus (+) circuit shorted to CAN C Bus (-) circuit,
or a TCM failure. Note: All CAN message missing DTCS will also be present, which
indicates a Bus Failure.
POSSIBLE CAUSES
CAN BUS CIRCUITS OPEN TO SKREEM OR ECM
CAN BUS CIRCUITS OPEN TO TCM
CAN CIRCUITS SHORTED TO GROUND
CAN CIRCUIT SHORT TO VOLTAGE
CAN CIRCUITS SHORTED TOGETHER
MODULE SHORT INTERNALLY
MODULE SHORT TO GROUND
MODULE SHORT TO VOLTAGE
ECM - TERMINATING RESISTOR
SENTRY KEY REMOTE ENTRY MODULE
TRANSMISSION CONTROL MODULE
48
TRANSMISSION - NAG1

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 With the DRBIIIt, read the active and stored DTCs for all modules that use CAN Bus
communication.
NOTE: Due to capabilities of certain controllers that use the CAN Bus, not
all modules report CAN Bus DTCs.
NOTE: If a total CAN Bus failure transpires, there will be multiple CAN Bus
DTCs present in many modules. If the other modules are reporting Trans-
mission CAN Bus messages ONLY, answer No for the following question.
Are other modules reporting active or stored CAN Bus communication DTCs?All
Ye s!Go To 3
No!Go To 12
3 Turn the ignition off to the lock position.
Disconnect the negative battery cable.
While back probing, measure the resistance between the CAN C Bus (+) and the CAN
C Bus (-) in the selected control module harness connector.
NOTE: Termination of the CAN Bus is located in the ECM and SKREEM.
Both modules use a 120.0 ohm resistor for termination of the CAN Bus. A
properly terminated CAN Bus will read 60.0 ohms   5.0 ohms.
Pick the one that best describes your readings:All
60.0 ohms   5.0 ohms.
Go To 4
120.0 ohms   5.0 ohms.
Go To 10
Less than 60.0 ohms
Go To 8
49
TRANSMISSION - NAG1
CAN BUS CIRCUIT ÐContinued

TEST ACTION APPLICABILITY
4 Turn the ignition on.
While back probing any module harness connector that uses the CAN Bus, measure
the voltage between the CAN C Bus (+) circuit and ground.
While back probing any module harness connector that uses the CAN Bus, measure
the voltage between the CAN C Bus (-) circuit and ground.
Is the voltage above 3.0 volts for either circuit?All
Ye s!Go To 5
No!Go To 6
5 Turn the ignition off.
Using a voltmeter, connect one end to the CAN circuit that previously measured
above 3.0 volts, and the other end to ground.
NOTE: When performing the following steps, turn the ignition off and WAIT
ONE MINUTE, before disconnecting any module. Repeat this for all mod-
ules, failure to turn off ignition may result in damaging the disconnected
module.
Turn the ignition on.
Disconnect a CAN Bus module the vehicle is equipped with. Monitor and note the
voltmeter reading.
NOTE: Repeat the above step for each CAN Bus module until all the modules
have been disconnected.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are on the CAN Bus.
Is the voltage steadily above 3.0 volts with all the modules disconnected?All
Ye s!Repair the CAN C Bus (+) circuit and/or the CAN C Bus (-) circuit
for a short to voltage.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the module that when disconnected, the short to voltage
was eliminated.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the negative battery cable.
While back probing, measure the resistance between ground and the CAN C Bus (+)
circuit.
While back probing, measure the resistance between ground and the CAN C Bus (-)
circuit.
Is the resistance below 50.0 ohms for either measurement?All
Ye s!Go To 7
No!Go To 8
50
TRANSMISSION - NAG1
CAN BUS CIRCUIT ÐContinued

TEST ACTION APPLICABILITY
7 Turn the ignition off.
Disconnect the negative battery cable.
Using an ohmmeter, connect one end to the CAN Bus circuit that previously
measured below 50.0 ohms and the other end to ground.
While monitoring the ohmmeter, disconnect a CAN Bus module and record the
reading.
NOTE: Repeat the above step for each CAN Bus module until all the modules
have been disconnected.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are on the CAN Bus.
Is the resistance below 50.0 ohms with all the modules disconnected?All
Ye s!Repair the CAN C Bus (+) circuit or the CAN C Bus (-) circuit for
a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the module that when disconnected, the short to ground
was eliminated.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
8 Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the SKREEM harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit.
Is the resistance below 50.0 ohms after disconnecting ECM and SKREEM?All
Ye s!Go To 9
No!Go To 10
9 Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the SKREEM harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit at any CAN Bus module harness connector.
Disconnect each CAN Bus module harness connector the vehicle is equipped with,
one at a time, while monitoring the resistance.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are on the CAN Bus.
Is the resistance below 50.0 ohms after disconnecting all the modules?All
Ye s!Repair the CAN C Bus (+) circuit for a short to the CAN C Bus (-)
circuit.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the module that when disconnected, the short was
eliminated.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
51
TRANSMISSION - NAG1
CAN BUS CIRCUIT ÐContinued

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

Symptom:
CAN MESSAGE FROM ECM FROM SLA
When Monitored and Set Condition:
CAN MESSAGE FROM ECM FROM SLA
When Monitored:
Set Condition: CAN Bus message received from the Shift Lever Assembly are incorrect.
POSSIBLE CAUSES
CAN BUS CIRCUIT DTC PRESENT
SHIFT LEVER DTCS PRESENT
OPEN CAN BUS CIRCUITS AT SHIFT LEVER
SHIFT LEVER ASSEMBLY
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.
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.
No!Go To 3
53
TRANSMISSION - NAG1

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