Specifications

TEST ACTION APPLICABILITY
3 Turn the ignition on.
With the DRBIIIt, erase ECM DTCs.
Turn the ignition off.
Install a substitute relay in place of the Engine Control Relay.
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
Yes → Go To 4
No → Replace the Engine Control Relay.
Perform ROAD TEST VERIFICATION - VER-2.
4 Turn the ignition off.
Remove the Engine Control Relay.
Disconnect the ECM harness connectors.
Measure the resistance of the Engine Control Relay Control circuit while wiggling
the wiring harness and connectors between the ECM and the Fuse Block #1.
Was the resistance above 10.0 ohms at any time while wiggling the wiring harness
and connectors?
All
Yes → Repair the Engine Control Relay Control circuit for an intermit-
tent open.
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.
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 inspectthe related wiring harness connectors. Look forbroken, 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.
90
DRIVEABILITY - DIESEL
P1610-ENGINE CONTROL RELAY SHUTS OFF TOO EARLY — Continued