Lull 944E-42 Service Manual - Manual (Page 593)

9.83 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Not
OK
Repair/replace ECM cab
harness.
Replace throttle position
sensor.
Not
OK
Engine speed drops to low
idle and there is no
response when the throttle
pedal is depressed.
Not
OK
At engine control module
power female harness
connector, at pin B,
wire [THP] (RED), check
for 5 VDC.
Refer to page 9.28 to
retrieve fault codes.
If OK
If OK
If OK
Check for 5 VDC at throttle
position sensor female
harness connector, at pin 1,
wire [THP] (RED).
Check resistance across pins
on at throttle position sensor
male connector. Resistance
across pins 1 and 3 should be
4,000 - 6,000 ohms.
Resistance across pins 2 and
3 should vary from
approximately 2,000 ohms,
with throttle pedal at rest, to
approximately 4,000 ohms,
with pedal fully depressed.
At P2 engine control
module power female
harness connector, at pin
29, wire [THP] (RED),
check for 5 VDC.
ECM issue.
Contact Cummins.
Repair/replace
ECM vehicle
power harness.
Not OK If OK Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. Fuses.
2. All connections relating to
circuit are clean and tight.
3. All grounding straps are
intact and securely
fastened, refer to Section
9.1.12, “General Overview
(Vehicle Ground Strap
Locations).”