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.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
All
Yes
→ Go To 2
No
→ Go To 8
2
NOTE: Check the ECM for other ECM DTC’s related to circuits that are
open, shorted to ground or low voltage problems.
Does the DRB also display these type of DTC’s?
All
Yes
→ Go To 3
No
→ Go To 4
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Connect a jumper wire between ground and the Engine Control Relay Signal 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 C1 harness connector cavities 1, 3 and 5.
Does the test light illuminate brightly for each circuit?
All
Yes
→ Go To 4
No
→ Refer to symptom list and perform Checking the ECM Power and
Grounds.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Boost Pressure Servo Motor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the 12 Volt Supply circuit in the
Boost Pressure Servo Motor harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 5
No
→ Repair the 12 Volt Supply circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
168
DRIVEABILITY - DIESEL
P2111-BOOST
PRESSURE
SERVO
MOTOR
CIRCUIT
SHORT
TO
GROUND —
Continued