TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t attempt to communicate with the Instrument Cluster.
NOTE: If there are other DTCs set with this DTC, refer to the Symptom List
and repair other stored ECM DTCs before diagnosing this DTC.
Is the Instrument Cluster communicating with the DRB?
All
Yes
→ Go To 2
No
→ Refer to the appropriate symptom in the Body Diagnostic Infor-
mation.
Perform ROAD TEST VERIFICATION - VER-2.
2
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 DRBIII
t, erase the ECM DTCs.
Turn the ignition off then turn the ignition on and wait 60 seconds.
With the DRBIII
t, read the ECM DTCs.
Does the DRB display this DTC?
All
Yes
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
3
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.
187
DRIVEABILITY - DIESEL
P1652-J1850 COMMUNICATION BUS RECEIVE TIMEOUT —
Continued