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DRIVEABILITY - DIESEL
P0850-P/N SWITCH PLAUSIBILITY —
TEST
3
Turn the ignition off.
Disconnect the TCM harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavities 30 and 87 in the ASD connector in the PDC.
Turn the ignition on.
Measure the voltage of the P/N Switch Sense circuit.
Is the voltage above 1.0 volt?
Yes → Repair the Park/Neutral Switch Sense circuit for a short to
→ Go To 4
No
4
Turn the ignition off.
Disconnect the TCM harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the P/N Switch Sense circuit.
Is the resistance below 10.0 ohms?
Yes → Go To 5
→ Repair the Park/Neutral Position Sense circuit for an open.
No
5
Turn the ignition off.
Disconnect the TCM harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the P/N Switch Sense circuit.
Is the resistance above 1000.0 ohms?
Yes → Replace and program the Engine Control Module in accordance
→ Repair the P/N Switch Sense circuit for a short to ground.
No
6
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
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Continued
162
APPLICABILITY
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