6E-90 Engine Control System (4HK1)
5
1.
Turn OFF the ignition.
2.
Wait 2 minutes for the fuel pressure to bleed
down from the fuel rail.
3.
Turn ON the ignition with the engine OFF. DO
NOT start the engine.
4.
Observe the FRP Sensor parameter with the
Tech 2.
Is the FRP Sensor parameter the specified value?
0.9 – 1.0 volt
Go to Step 6
Go to Step 13
6
1.
Turn OFF the ignition.
2.
Check the fuel system line connections
between the fuel tank and the fuel supply
pump for tightness and all fuel hoses for cuts,
cracks and for the use of proper clamps.
Notice:
The fuel system from the fuel tank(s) to the fuel
supply pump is under a slight vacuum with the
engine running. As a result, air can enter the fuel
system if these connections are not tight. Air in the
fuel system will cause fuel rail pressure fluctuations
especially at high engine speed and load, which
may set this DTC.
3.
Pump the priming pump on the fuel filter until it
becomes firm. If there is a leak on the suction
side of the fuel system between the priming
pump and the fuel supply pump, the priming
pump will not build up sufficient firmness and
fuel leakage may occur.
4.
Start the engine and check for high side fuel
system leaks at the fuel supply pump and fuel
rail.
Notice:
Fuel may leak under the cylinder head cover from
the inlet high pressure line. In such case, the
engine oil level will rise. Inspect for fuel leakage
into the engine oil.
5.
Repair any fuel system leaks as necessary.
Did you find and correct the condition?
—
Go to Step 20
Go to Step 7
Step
Action
Value(s)
Yes
No