Symptom:
*CHECKIN G THE P OWER AN D GROUN D S
POSSIBLE CAUSES
CH E CKIN G TH E E NGIN E CONTROL RE LAY S YSTE M
EC RELAY OUTPUT CIRCUIT
ECM GROUND CIRCUIT(S) OP EN
ECM OUTPUT SHORTED - FUSE 16
ENGINE CONTROL MODULE
ENGINE CONTROL RELAY
ENGINE CONTROL RELAY B+ SUPPLY
ENGINE CONTROL RELAY CONTROL CIRCUIT OPEN
ENGINE CONTROL RE LAY CONTROL CIRCUIT SH ORT TO VOLTAGE
ENGINE CONTROL RE LAY OUTP UT CIRCU IT(S) OP EN
ENGINE CONTROL RELAY OUTPUT CKT SHORTED TO GROUND FUSE #16
ENGINE CONTROL RELAY OUTPUT CKT SHORTED TO GROUND FUSE #17
IGNITION SWITCH START OUTPUT CIRCUIT OPE N
IGNITION SWITCH START/RUN OUTP UT CIRCUIT OP E N
SHORTED COMPONE NT
TE S T ACTION AP PLICAB ILITY
1 Tur n th e ign it ion off.
Discon n ect t he E CM ha r n ess con n ect or s.
Usin g a 12-volt t est ligh t conn ect ed to 12-volt s, ch eck ea ch of t he ECM gr ou n d
cir cu it s in E CM h a r ness con n ect or C2 cavit ies 2, 4 an d 6.
Did t h e t est ligh t illum in a te br igh t ly for ea ch cavit y?
All
Ye s → Go To 2
No → Repa ir th e E CM Gr ou n d cir cu it (s) for a n open .
Per for m ROAD TE ST VE RIF ICATION - VER-2.
2 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 swit ch to t h e St a r t posit ion .
Usin g a 12-volt t est ligh t con n ect ed t o grou n d, ch eck th e F u sed Ign it ion Swit ch St a r t
Ou t pu t cir cuit in ECM C2 ha r n ess con n ect or ca vit y 36.
Does t h e test ligh t illu min a t e br igh t ly?
All
Ye s → Go To 3
No → Repa ir th e Ignit ion Swit ch St a r t Ou tpu t cir cu it for an open .
Per for m ROAD TE ST VE RIF ICATION - VER-2.
235
DRI V EABI LI T Y - DI ESEL
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