Symptom:
P 1612-IGN ITION VOLTAGE - VOLTAGE ERROR
POSSIBLE CAUSES
CH E CK TH E E CM P OWER AND GROU NDS
ENGINE CONTROL MODULE
INTERMITTENT CONDITION
TE S T ACTION AP PLICAB ILITY
1 Tur n th e ign it ion on .
Wit h th e DRBIII",eraseECMDTCs.
Per for m sever a l en gin e r u n cycles, tu r nin g th e ign ition off for a t lea st 20 secon ds
bet ween ea ch en gine r u n cycle.
Wit h th e DRBIII",readtheECMDTCs.
Did t h is DTC set a ga in ?
All
Ye s → Go To 2
No → Go To 3
2 Refer t o sym pt om Ch eckin g t h e ECM P ower a n d Gr ou n ds.
Are t h e ECM Power an d Gr ou n d cir cu it s o.k.?
All
Ye s → Repla ce th e E CM in a ccor da n ce with t h e Ser vice In for m a t ion .
Per for m ROAD TE ST VE RIF ICATION - VER-2.
No → Repa ir as n ecessa r y.
Per for m ROAD TE ST VE RIF ICATION - VER-2.
3 WARN IN G: WHEN THE E N GIN E IS OP ERATIN G, D O N OT STAN D IN A
DIR ECT LIN E WITH THE FAN . D O N OT P UT YOU R HAN D S NEAR THE
P ULLEYS , B ELTS OR FAN . D O NOT WEAR LOOS E CLOTHIN G.
NOTE: The conditions that set the DTC are not present at this time. The
fo ll o wi n g l is t ma y h e l p i n id en t i fy ing the i n t e rmi tt e nt c o nd i ti o n .
Wit h t h e en gin e r u n n in g a t n or m a l oper a t in g t em per a t u r e, m onit or t h e DRB
pa r a m et er s rela ted t o t h e DTC while wiggling th e wir ing ha r n ess. Look for pa r a m -
et er va lu es t o ch a n ge a n d/or a DTC to set .
Review t h e DTC Wh en Monit or ed a n d Set Con dit ion s. If possible, t r y to du plica t e t h e
condit ion s u n der wh ich t h e DTC wa s set .
Refer t o a n y Tech n ica l Service Bu llet in s (TSB) t h a t m a y a pply.
Visu a lly in spect t h e rela t ed wirin g h a r n ess. Look for a n y ch a fed, pier ced, pin ched, or
pa r t ia lly br oken wir es.
Visu a lly in spect t h e r ela t ed wir ing h a r n ess conn ect or s. Look for br oken , ben t , pu sh ed
out , or cor r oded t er m in a ls.
Wer e an y of t h e above condit ion s pr esen t ?
All
Ye s → Repa ir a s n ecessa ry.
Per for m ROAD TE ST VE RIF ICATION - VER-2.
No → Test Com plet e.
99
DRI V EABI LI T Y - DI ESEL
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