Mercedes-Benz Sprinter / Dodge Sprinter. Service manual — part 139
Symptom List:
P2110-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT CIR-
CUIT
P2112-BOOST PRESSURE SERVO MOTOR CIRCUIT EXCESSIVE
CURRENT
P2526-BOOST PRESSURE SERVO MOTOR SHORT TO VOLTAGE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2110-BOOST PRESSURE
SERVO MOTOR CIRCUIT SHORT CIRCUIT.
When Monitored and Set Condition:
P2110-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT CIRCUIT
When Monitored:
With the ignition on.
Set Condition:
The ECM detects a short to battery on the Boost Pressure Servo Motor
Control circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
BOOST PRESSURE SERVO MOTOR
BOOST PRESSURE SERVO MOTOR CONTROL SHORT TO VOLTAGE
ENGINE CONTROL MODULE - INTERNAL
ENGINE CONTROL MODULE - INTERNAL SHORT TO VOLTAGE
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.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC set again?
All
Yes
→ Go To 2
No
→ Go To 5
164
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the Boost Pressure Servo Motor harness connector.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Does the DRB display BOOST PRESSURE SERVO MOTOR OPEN CIRCUIT?
All
Yes
→ Replace the Boost Pressure Servo Motor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Boost Pressure Servo Motor harness connector.
Turn the ignition on.
Measure the voltage of the Boost Pressure Servo Motor Control circuit.
Is the voltage below 0.5 volt?
All
Yes
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Boost Pressure Servo Motor 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 Boost Pressure Servo Motor Control circuit.
Is the voltage below 0.5 volt?
All
Yes
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Repair the Boost Pressure Servo Motor Control circuit for a short
to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
165
DRIVEABILITY - DIESEL
P2110-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
5
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.
166
DRIVEABILITY - DIESEL
P2110-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT CIRCUIT —
Continued
Symptom List:
P2111-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT TO
GROUND
P2112-BOOST PRESSURE SERVO MOTOR CIRCUIT OPEN CIR-
CUIT
P2510-BOOST PRESSURE SERVO MOTOR SHORT TO GROUND
P2526-BOOST PRESSURE SERVO MOTOR OPEN CIRCUIT
P2526-BOOST PRESSURE SERVO MOTOR SHORT TO GROUND
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2111-BOOST PRESSURE
SERVO MOTOR CIRCUIT SHORT TO GROUND.
When Monitored and Set Condition:
P2111-BOOST PRESSURE SERVO MOTOR CIRCUIT SHORT TO GROUND
When Monitored:
With the ignition on.
Set Condition:
The ECM detects a short to battery on the Boost Pressure Servo Motor
Control circuit.
P2112-BOOST PRESSURE SERVO MOTOR CIRCUIT OPEN CIRCUIT
When Monitored:
With the ignition on.
Set Condition:
The ECM detects an open or short to ground on the Boost Pressure Servo
Motor Control circuit.
POSSIBLE CAUSES
CHECKING THE ENGINE CONTROL RELAY SYSTEM
INTERMITTENT CONDITION
12 VOLT SUPPLY CIRCUIT OPEN
BOOST PRESSURE SERVO MOTOR CONTROL CIRCUIT SHORTED TO GROUND
BOOST PRESSURE SERVO MOTOR CONTROL CKT OPEN
BOOST PRESSURE SERVO MOTOR
ENGINE CONTROL MODULE
167
DRIVEABILITY - DIESEL
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