P187 4 - VERNIER CONTROL INPUT FAILED LOW (VOLTAGE LOW) (ALSO CALLED VARIABLE SPEED GOVERNOR

TM 9-2320-364-20-1

Section IV. TROUBLESHOOTING CHARTS (Cont.)

E. FLASH CODE:

J1587 CODE:

P187 4 - VERNIER CONTROL INPUT FAILED LOW (VOLTAGE LOW)

(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)

STEP/SEQUENCE

RESULT

WHAT TO DO NEXT

11-13

Check for Outside

DDEC Battery +

Turn ignition off.

All readings

Go to 11-9.

Deleted.

less than 4.0 volts.

Remove ECM vehicle harness

Either reading

Outside power is shorted to

connector.

greater than or

either ckt #952 or ckt #916.

Turn ignition on.

equal to 4.0 volts.

Repair short. Then go to

Read voltage A3 (916) to a

11-30.

good ground.

Read voltage C3 (952) to a

good ground.

11-30

Verify Repairs

Turn ignition off.

No codes.

Repairs are complete.

Reconnect all connectors.

Turn ignition on.

Code 187/4 (and

All system diagnostics are

Clear codes.

any other codes).

complete. Please review this

Note status of "Check Engine"

section from the first step

light.

to find the error.

If "Check Engine" light does not

stay on, start engine and run

Any other codes

Go to START-1, pg 2-539, to

(TM 9-2320-364-10) until

except Code 187/4.

service other codes.

"Check Engine" light comes on

or 1 minute.

Stop engine.

Read all codes.

2-623