CHART - 10 - VARIABLE SPEED GOVERNOR (VSG OR CRANE HIGH IDLE) INOPERATIVE (Cont'd) -726280681

TM 9-2320-364-20-1

Section IV. TROUBLESHOOTING CHARTS (Cont.)

D. CHART - 10 - VARIABLE SPEED GOVERNOR (VSG OR CRANE HIGH IDLE) INOPERATIVE (Cont'd)

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

C 10-8

Check ECM

Connectors

Turn ignition off.

Terminals and

Replace ECM (para 7-57).

Disconnect vehicle harness

connectors are okay.

Then go to C 10-30.

connector at ECM.

Check terminals at vehicle

harness connector (both ECM

Problem found.

Repair terminals/connectors

and harness side) for damage;

(para 7-101). Then go to

bent, corroded, and unseated

C 10-30.

pins or sockets.

C 10-9

Check for Open

Turn ignition off.

Greater than

Signal line (ckt #525 or #510)

Make sure vehicle is in neutral.

5 ohms or open.

ground line (ckt #952) or the

Disconnect vehicle harness

Neutral start circuit

connector at ECM.

has an open. Repair open.

Also disconnect vernier control

Then go to C 10-30.

connector (para 7-95).

Install a jumper wire between pins

Less than or

Go to C 10-10.

A and B of the vernier control

equal to 5 ohms.

connector.

Read resistance between sockets

D1 (#510) and C3 (#952) on

vehicle harness connector.

C 10-10

Check for +5 Volt

Line Open

Move jumper so that it is now

Greater than

The +5 volt line (ckt #916)

between pins C and A of vernier

5 ohms or open.

is open. Repair open. Then go

control connector.

to C 10-30.

Read resistance between sockets

A3 (#916) and C3 (#952) on

Less than or

Go to C 10-11.

vehicle harness connector.

equal to 5 ohms.

2-611