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P1605-IGNITION SWITCH PLAUSIBILITY —
TEST
3
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the ignition switch harness connector.
Measure the resistance between ground and the Fused Ignition Switch Output
(RUN/START) circuit.
Is the resistance above 100 kohms?
Yes → Go To 4
→ Repair the Fused Ignition Switch Output (RUN/START) circuit
No
4
If there are no possible causes remaining, view repair.
Repair
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?
Yes → Repair as necessary.
→ Test Complete.
No
ACTION
for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
Using the schematic, ensure no shared circuits on the Fused
Ignition Switch Output (RUN/START) ckt are causing an initial
low spike in circuit voltage. If all other components are OK,
replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
Continued
193
APPLICABILITY
All
All
All
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