Page 333 - Foton Workshop Manual - Tunland (AT)
P. 333
DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-187
P271，P272，P2311-ENGINE FUEL PUMP BOOSTER ASSEMBLY
FAULT
P271-ENGINE FUEL PUMP BOOSTER ASSEMBLY 1 CIRCUIT
-VOLTAGE IS BELOW NORMAL OR SHORTED TO HIGH VOLTAGE
POWER SUPPLY 04
P272-ENGINE FUEL PUMP BOOSTER ASSEMBLY 1 CIRCUIT
-VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH VOLTAGE
POWER SUPPLY
P2311-ELECTRONIC FUEL INJECTION CONTROL VALVE CIRCUIT
- FAULT EXISTS
Description
1 . The engine fuel pump booster assembly is a pulse width modulation (PWM)
driver in the engine control module (ECM) that controls the electronic fuel control
actuator.The actuator ground via the ECM and is normally open.The PWM load
cycle output to the electronic fuel control actuator is determined by the difference
between desired oil rail pressure and the induced oil rail pressure.
Circuit Diagram
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