P1689 No Communication Between ECM & Injection Pump Module. next, check for fuel pump signal at the fuel system control module. However, the ECM and fuel injection pump control unit (PCU) communicates No Communication Between ECM & Injection Pump Module. Check relay, replace if less than 18 Ohms using a digital Ohm Meter.
POSSIBLE CAUSES WIRING AND CONNECTORS FUEL INJECTION PUMP RELAY OUTPUT CIRCUIT OPEN GROUND CIRCUIT OPEN OR HIGH 2. If no fault is detected in the wiring and the voltage was Not correct: Replace the Engine Control Module (ECM) (J623).No communication between ecm and injection pump module
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