Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 124
Symptom List:
P1681-ACM CIRCUIT FAULT
P1681-ACM CIRCUIT SHORT TO VOLTAGE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1681-ACM CIRCUIT FAULT.
POSSIBLE CAUSES
AIRBAG CONTROL MODULE
INTERMITTENT CONDITION
ACM SIGNAL CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
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.
With the DRB, check the Airbag Module for proper communication and DTCs. If
there are any ACM DTCs, repair them prior to continuing this test.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine.
With the DRB, read ECM DTCs.
Did this DTC set again?
All
Yes
→ Go To 2
No
→ Go To 4
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the Engine Control Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the Engine Control Relay
connector.
Turn the ignition on.
Measure the voltage of the ACM Signal circuit.
Is the voltage below 1.0 volt?
All
Yes
→ Replace the Engine Control Module in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
104
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Refer to the Service Information and disconnect the ACM harness connector.
Disconnect the ECM harness connectors.
Remove the Engine Control Relay from the Fuse Block No.1
Connect a jumper wire between cavity 30 and cavity 87 of the Engine Control Relay
connector in Fuse Block No.1.
Turn the ignition on.
Measure the voltage of the ACM Signal circuit.
Is the voltage below 1.0 volt?
All
Yes
→ Replace and program the Airbag Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Repair the ACM Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
4
WARNING: 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
Yes
→ Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Test Complete.
105
DRIVEABILITY - DIESEL
P1681-ACM CIRCUIT FAULT —
Continued
Symptom List:
P2009-WATER IN FUEL SENSOR - WATER IN FUEL
P2009-WATER IN FUEL SENSOR SIGNAL ERROR
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2009-WATER IN FUEL SENSOR
- WATER IN FUEL.
POSSIBLE CAUSES
12-VOLT SUPPLY CIRCUIT OPEN
CHECKING ECM POWER AND GROUNDS
CHECKING THE ENGINE CONTROL RELAY SYSTEM
ECM - WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
ECM - WATER IN FUEL SENSOR SIGNAL SHORT TO GROUND
SENSOR GROUND CIRCUIT OPEN
WATER IN FUEL SENSOR FAILURE
WATER IN FUEL SENSOR SIGNAL CIRCUIT OPEN
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO 12-VOLT SUPPLY
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
NOTE: 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: If you are here due to a P2009 indicating
(Water In The Fuel Filter(
DTC, ensure that the fuel system is not contaminated with water or other
fluids before continuing.
NOTE: If the fuel system is contaminated, refer to the Service Information
to remove fuel, clean system and refill with known good fuel.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Start the engine several times, letting the engine run for at least 30 seconds at a
time.
With the DRB, read ECM DTCs.
Did this DTC set again?
All
Yes
→ Go To 2
No
→ Go To 11
106
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Connect a jumper wire between ground and the Engine Control Relay Control circuit
in ECM C2 harness connector cavity 44.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Engine Control Relay
Output circuits at the ECM C2 harness connector cavities 1, 3 and 5.
Choose the appropriate result.
All
Test light is on for all circuits.
Test light is on for 1 or 2 circuits
Repair the Engine Control Relay Output circuit(s) that did not
illuminate brightly for an open.
Perform ROAD TEST VERIFICATION - VER-2.
Light off for all circuits.
Refer to symptom Checking the ECM Power and Grounds.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the Water In Fuel Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Water In Fuel Sensor Signal circuit.
Select the appropriate voltage reading.
All
Voltage is above 5.4 volts.
Voltage is between 4.7 and 5.4 volts.
Voltage is below 4.7 volts.
4
Turn the ignition off.
Disconnect the In Fuel Level Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the Engine Control Relay.
Connect a jumper wire between cavity 30 and cavity 87 of the Engine Control Relay
connector.
Turn the ignition on.
Measure the voltage of the Water In Fuel Sensor Signal circuit.
Is the voltage below 1.0 volt?
All
Yes
→ Go To 5
No
→ Repair the Water In Fuel Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
107
DRIVEABILITY - DIESEL
P2009-WATER IN FUEL SENSOR - WATER IN FUEL —
Continued
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