P0202 and P0204 injector codes . What do I look at to fine the fix.

Check your wiring and connectors to the injectors.

P0201 -- Injector 1 – circuit malfunction Wiring, injector, ECM
P0202 -- Injector 2 – circuit malfunction Wiring, injector, ECM
P0203 -- Injector 3 – circuit malfunction Wiring, injector, ECM
P0204 -- Injector 4 – circuit malfunction Wiring, injector, ECM

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

Put a code reader on today , also threw a P0300 . Multi cyl. misfire.
I’ll check wiring, how much voltage should I get at injector plug?
The trouble is it’s erratic.
Thanks Gary

I seems like it ran ok when first starting up while in warm up mode ( choke on ) but it’s hard to tell. It doesn’t do it for weeks at a time.
Gary

The signal going to the injectors is a pulse width modulated signal from the ECM and would have to be measured or monitored with a scope.
You could always contact Marco (aka Yeti on this forum) for more in-depth information on the signals going to the injectors.

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve