TEST
ACTION
APPLICABILITY
16
Turn the ignition on.
With the DRB III, select Engine and with the custom display feature select Low Idle
Switch input and the Accel Pedal %.
Slowly depress and release the accelerator pedal several times while monitoring the
DRB III display.
NOTE: The Low Idle Switch state should change between 5% and 10% of
Accelerator Pedal position.
Did the Low Idle Switch state change between 5% and 10% of Accelerator Pedal
position?
All
Yes
→
Go To
17
No
→
Replace the Accelerator Pedal Position Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
17
WARNING: KEEP CLEAR OF THE ENGINE’S MOVING PARTS.
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 and 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.
18
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Turn the ignition on.
Measure the voltage of the APP Sensor Signal circuit.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the APP Sensor Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To
19
120
DRIVEABILITY - DIESEL
P1515-ACCEL. PEDAL SENSOR PLAUSIBILITY —
Continued