2006 MERCEDES-BENZ SPRINTER check engine

Symptom:
P0600-CAN DATA BUS - BUS CIRCUIT FAULT
When Monitored and Set Condition:
P0600-CAN DATA BUS - BUS CIRCUIT FAULT
When Monitored: With the ignition on.
Set Condition: The ECM detects an open, short to ground or short to voltage on the CAN
Bus circuit.
POSSIBLE CAUSES
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
CAN BUS COMMUNICATION DTCS
CAN BUS CIRCUITS OPEN TO TCM
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIIIt, erase the ECM DTCs.
Test drive the vehicle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Go To 2
No!Go To 4
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 Engine
CAN Bus message faults or DTC's related to ECM CAN messages ONLY,
answer No for the following question.
Are other modules reporting active or stored CAN Bus communication DTCs?All
Ye s!Refer to symptom list for problems related to CAN Bus Failure.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
71
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
3 Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Disconnect the ECM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of both the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit between the TCM C2 harness connector and ECM harness connector.
Is the resistance below 10.0 ohms for each measurement?All
Ye s!Replace the Engine Control Module in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No!Repair the CAN C Bus (+) and/or CAN C Bus (-) circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
4WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?All
Ye s!Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No!Test Complete.
72
DRIVEABILITY - DIESEL
P0600-CAN DATA BUS - BUS CIRCUIT FAULT ÐContinued

TEST ACTION APPLICABILITY
1NOTE: If DTC P1611, P2306 or P2332 is present with this DTC, diagnose
DTCs P1611, P2306 or P2332 before diagnosing this DTC.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
NOTE: The APP Sensor is a device that contains 2 separate potentiometer
type sensors. Each sensor has its own 5-volt supply circuit, sensor ground
circuit and signal circuit. The APP Sensor no longer incorporates a low-idle
switch.
NOTE: The APP Sensor 2 signal should always be approximately 1/2 the
voltage of the APP Sensor 1 signal.
Turn the ignition on.
Using a voltmeter, backprobe the APP Sensor 1 and APP Sensor 2 Signal circuits at
the APP Sensor harness connector with the accelerator pedal in the at rest position.
Is the voltage between 0.28 and 0.37 volt for sensor 1 and 0.10 and 0.19 volt for sensor
2?All
Ye s!Go To 2
No!Go To 5
2 Turn the ignition on.
Fully depress the accelerator pedal.
Using a voltmeter backprobe the APP Sensor harness connector and read the voltage
for APP Sensor 1 and APP Sensor 2 Signal circuits.
Is the voltage between 4.45 and 4.75 volts for #1 and 2.15 and 2.45 volts for #2?All
Ye s!Go To 3
No!Go To 5
3 Turn the ignition on.
With the DRB, read the APP Sensor 1 and APP Sensor 2 percentages (%).
With the accelerator pedal in the idle position, slowly depress the accelerator pedal
until the pedal is fully depressed.
NOTE: The percentage readings for APP Sensors 1 and 2 should increase
smoothly as the pedal is depressed.
NOTE: This test can also performed using a voltmeter by back probing each
APP Sensor Signal circuit at the APP Sensor harness connector and
observing the voltmeter for a smooth voltage change through the entire
pedal travel.
Does the percentage (voltage) increase smoothly for both readings with the acceler-
ator pedal travel?All
Ye s!Go To 4
No!Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
74
DRIVEABILITY - DIESEL
P1222-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY ÐContinued

TEST ACTION APPLICABILITY
8 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between the APP Sensor and the
ECM.
Is the resistance below 10.0 ohms?All
Ye s!Go To 9
No!Repair the APP Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
9 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Using a 12-volt test light connected to 12-volts, check the Sensor Ground circuit of
the appropriate potentiometer.
Does the test light illuminate brightly?All
Ye s!Replace the Accelerator Pedal Position Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
10 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the APP Sensor Signal circuit.
Is the resistance below 10.0 ohms?All
Ye s!Go To 11
No!Repair the APP Sensor Signal circuit for an open
Perform ROAD TEST VERIFICATION - VER-2.
11 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the APP Sensor Signal circuit.
Is the resistance below 1000 ohms?All
Ye s!Repair the APP Sensor Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 12
12 Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the APP Sensor Signal circuit and the Sensor
Ground circuit at the APP Sensor harness connector.
Is the resistance below 1000 ohms?All
Ye s!Repair the APP Sensor Signal and Sensor Ground circuits for a
short together.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 13
76
DRIVEABILITY - DIESEL
P1222-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY ÐContinued

Symptom List:
P1482-GLOW PLUG MODULE - COMMUNICATION ERROR
P2537-GLOW PLUG CONTROL CIRCUIT PREGLOW FAULT
P2537-GLOW PLUG CONTROL CIRCUIT PREGLOW SHORT TO
GROUND
P2537-GLOW PLUG CONTROL CIRCUIT PREGLOW SHORT TO
VOLTAGE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1482-GLOW PLUG MODULE -
COMMUNICATION ERROR.
POSSIBLE CAUSES
ENGINE CONTROL MODULE
GLOW PLUG CONTROL SIGNAL CIRCUIT OPEN
GLOW PLUG CONTROL SIGNAL CIRCUIT SHORTED TO GROUND
GLOW PLUG CONTROL SIGNAL CIRCUIT SHORTED TO VOLTAGE
GLOW PLUG MODULE
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds
between each engine run cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC set again?All
Ye s!Go To 2
No!Go To 6
2 Turn the ignition off.
Disconnect the Glow Plug Module harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the Glow Plug Control Signal circuit.
Measure the resistance of the Glow Plug Module Control circuit.
Is the resistance below 10.0 ohms?All
Ye s!Go To 3
No!Repair the Glow Plug Control Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
80
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition cycles leaving the ignition on for at least 10 seconds then off
for 10 seconds.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Go To 2
No!Go To 6
2 Turn the ignition off.
Disconnect each Glow Plug harness connector.
Disconnect the Glow Plug Module harness connector.
Measure the resistance of each Glow Plug Control circuit.
Is the resistance below 10.0 ohms for each circuit?All
Ye s!Go To 3
No!Repair the appropriate Glow Plug Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3 Turn the ignition off.
Disconnect each Glow Plug harness connector.
Disconnect the Glow Plug Module harness connector.
Measure the resistance between ground and each Glow Plug Control circuit.
Is the resistance below 1000.0 ohms for any of the measurements?All
Ye s!Repair the appropriate Glow Plug Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 4
4 Turn the ignition off.
Disconnect each Glow Plug harness connector.
Disconnect the Glow Plug Module harness connector.
Turn the ignition on.
Measure the voltage of each Glow Plug Control circuit.
Is the voltage below 1.0 volt for each circuit?All
Ye s!Go To 5
No!Repair the appropriate Glow Plug Control circuit for a short to
voltage
Perform ROAD TEST VERIFICATION - VER-2.
83
DRIVEABILITY - DIESEL
P1482-GLOW PLUG MODULE - EXCESS CURRENT ÐContinued

Symptom List:
P1482-GLOW PLUG MODULE - INCORRECT TIMER
P1482-GLOW PLUG MODULE - INTERNAL FAULT
P2538-GLOW PLUG MODULE COMMUNICATION ERROR
P2538-GLOW PLUG MODULE EXCESSIVE CURRENT ERROR
P2538-GLOW PLUG MODULE TIMER ERROR
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1482-GLOW PLUG MODULE -
INCORRECT TIMER.
POSSIBLE CAUSES
GLOW PLUG MODULE
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
NOTE: This DTC indicates an internal Glow Plug Control Module problem
or an incorrect Glow Plug Module has been installed.
Turn the ignition on.
With the DRBIIIt, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds
between each engine run cycle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?All
Ye s!Replace and program the Glow Plug Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 2
85
DRIVEABILITY - DIESEL

Symptom:
P1610-ENGINE CONTROL RELAY PLAUSIBILITY
When Monitored and Set Condition:
P1610-ENGINE CONTROL RELAY PLAUSIBILITY
When Monitored: During after-run.
Set Condition: The internal ECM timer determines that the Engine Control Relay
remains on for more than 2.0 seconds after the ECM has turned off the Engine Control
Relay.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
CHECK THE ECM POWER AND GROUNDS
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
SUBSTITUTE ENGINE CONTROL RELAY
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, check for additional DTCs.
Are other DTCs present?All
Ye s!Refer to the Symptom List for diagnosis of the other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 2
2NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Perform several ignition key cycles, pausing for at least 10 seconds between each
cycle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC set again?All
Ye s!Go To 3
No!Go To 5
87
DRIVEABILITY - DIESEL