Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hi Im David, P1670 is communication error between the PCM(powertrain control module) and the IDM(injector driver module)
Check fuel pressure for 50 PSI or greater. In DATA, monitor engine RPM during engine cranking for greater than 150. Monitor Injection Control Pressure (ICP) for greater than 500 PSI and the Injection Pressure Regulator (IPR) for an initial starting value of 15% and increasing as cranking continues. If all OK, gain access to the Injector Driver Module (IDM). Remove the connector and using 2 jumper wires and a sealed beam headlamp, connect headlamp to terminals 14, Dark Green/Light Green of the IDM connector for the power source and 26, Black/Pink of the connector for the headlamp ground. Cycle the ignition key on to energize the IDM relay and check headlamp for bright illumination. If dim or not lit, check IDM relay operation and for possible wiring concern from the engine compartment fuse box to the IDM. If good illumination, replace defective IDM.
does the truck lack power even when driving down the road?
do you still need assistance?
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
The tech which was helping has opted out. Would you like me to help with this possible PCM issue? Is your vehicle altered from OEM in any way.
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Hello again Chris here,