Lull 944E-42 Service Manual User Manual download pdf (Page 593)

100

101

9.83

Model 644E-42/944E-42 Rev. 6/04

Electrical System

Not

Repair/replace ECM cab

harness.

Replace throttle position

sensor.

Not

Engine speed drops to low

idle and there is no

response when the throttle

pedal is depressed.

Not

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

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 OKIf 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).”

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