TE S T ACTION AP PLICAB ILITY
1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the
e n gi n e /ve h ic le o p e ra ti n g c o n d i tio n s u n d e r w h ic h th e D TC w a s s e t. S o m e o f
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
WARN IN G: HIGH -P RES S U RE F U EL LIN ES D ELIVER D IE S EL F U E L U N -
DE R EXTRE ME P R ES S U RE FROM THE IN J E CTION P U MP TO THE FU EL
IN JE CTORS . TH IS MAY B E AS H IGH AS 2 3,200 PS I (16 00 B AR ). U S E
EXTREME CAU TION WHEN IN S P ECTING F OR H IGH -P RES S U RE FU EL
LE AKS .
WA R N I N G : F U E L U N D E R T H I S A M O U N T O F P R E S S U R E C A N P E N E -
TR ATE S KIN CAU S IN G PE RS ON AL IN JU RY OR D E ATH . IN S P E CT F OR
HIGH-P RES S U RE F U EL LEAKS WITH A S H EET OF CARD B OARD . WEAR
SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN
SE RVICIN G F U E L SYS TEM.
Tur n th e ign it ion on .
Wit h th e DRB, er a se E CM DTCs.
St a r t t h e en gin e sever a l tim es, t u r n in g th e ignit ion off for at lea st 30 secon ds
bet ween ea ch ru n cycle.
Mon it or th e DRB for ECM DTCs.
Did t h is DTC set a ga in ?
All
Ye s → Go To 2
No → Go To 8
2 NOTE: Check the ECM for other ECM DTC’s related to circuits that are
open, shorted to ground or low voltage problems.
Does t h e DRB a lso displa y t h ese type of DTC’s?
All
Ye s → Go To 3
No → Go To 4
3 Tur n th e ign it ion off.
Discon n ect t he E CM ha r n ess con n ect or s.
Tur n th e ign it ion on .
Con n ect a ju mper wir e bet ween gr ou n d a n d t h e E n gin e Con t r ol Rela y Sign al circu it
in ECM C2 h a r ness con n ect or cavit y 44.
Usin g a 12-volt test ligh t con n ect ed to grou n d, ch eck th e Fu sed En gin e Con t r ol Rela y
Ou t pu t cir cuit s a t th e ECM C1 h a rn ess con n ect or cavit ies 1, 3 an d 5.
Does t h e test ligh t illu min a t e br igh t ly for ea ch circu it?
All
Ye s → Go To 4
No → Refer to sym pt om list a nd per for m Ch eckin g th e E CM Power an d
Gr ou n ds.
Per for m ROAD TE ST VE RIF ICATION - VER-2.
174
DRI V EABI LI T Y - DI ESEL
P 2151-F U EL P RES S S OLEN OID S IGN AL P LAU S IBILITY HIGH —
Co n t in ued
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