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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
11
J1587 CODE:
Pl87 4-
POWER TAKE OFF INPUT FAILED LOW (VOLTAGE LOW)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
NOTE - This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-III was started at step START-1, pg H-25 and you have now been referred here.
11-1
Multiple Code Check
l Were there any other active codes
No other
besides 187/4?
active codes.
11-2 Sensor Check
l Turn ignition off.
l Disconnect vernier control
connector.
l Install a jumper wire between
sockets B and C of the vernier
harness connector.
l Turn ignition on.
l Read active codes.
11-3
Check Vernier
Control Adjustment
l Remove jumper and reconnect
vernier control.
l Hook-up DDR to the DDL
connector and select VSG
CNTS.
l Position left ENGINE SPEED
CONTROL switch to HIGH
ENGINE IDLE and press PUSH
TO LOCK ENGINE @ HIGH IDLE
switch.
l Read counts.
11-4
Attempt Vernier
Control Adjustment
l Replace vernier control
(para 7-76).
RESULT
WHAT TO DO NEXT
Yes, any or all
Go to VEH5V-1 , page H-247.
of the following active
codes: 187/3, 91/3 or 4,
100/4, 102/4, 110/4,
174/4,
175/4.
Yes - but none
of the above.
Go to 11-2.
Code 187/3 (and/or
other codes).
Go to 11-6.
Code 187/4 (and any
other codes).
Go to 11-3.
Go to 11-5.
Go to 11-4.
Corrected
Go to 11-30.
problem so that Throttle
Counts is now correct.
Could not correct the
problem.
Go to 11-5.
H-103
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