Test Auxiliary rpm sensor Flash code: 14x short Fault indication: Fault indicated by steady light at EDC indicator lamp Fault path: Auxiliary rpm sensor Statically implausible Dynamically implausible Implausible with rpm sensor Effect of fault: Reduced full load delivery volume Reduced final engine speed n = 2000–2100 rpm If the rpm sensor also fails, the engine will be shut down Possible cause: Line break, short to ground, auxiliary rpm sensor defective, control unit defective Test precondition:
Disconnect EDC control unit to ensure the engine cannot start up Socket box connected U > 2 V 46 Test Measurement Corrective measures Resistance Measure resistance at socket box across in 22 and pin 17 Setpoint: 800–1000 Ω – Check lines – Check plug connections – If no fault found, replace auxiliary rpm sensor Engine speed signal Check signal at socket box at start- ing speed across pin 22 (+) and pin 17 (–) with oscilloscope Setpoint: See figure